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Influence of mechanical grinding on particle group characteristics and cementation activity of magnesium slag from Xinjiang Tengxiang 机械磨矿对新疆腾翔镁渣颗粒群特征及胶结活性的影响
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142081
Jian Yang , Xiaobing Yang , Xi Wang , Shenghua Yin , Xizhi Zhang , Yaobin Qi
{"title":"Influence of mechanical grinding on particle group characteristics and cementation activity of magnesium slag from Xinjiang Tengxiang","authors":"Jian Yang ,&nbsp;Xiaobing Yang ,&nbsp;Xi Wang ,&nbsp;Shenghua Yin ,&nbsp;Xizhi Zhang ,&nbsp;Yaobin Qi","doi":"10.1016/j.conbuildmat.2025.142081","DOIUrl":"10.1016/j.conbuildmat.2025.142081","url":null,"abstract":"<div><div>To study the effect of mechanical grinding on the characteristics of magnesium slag (MS) particle group and cementation activity, the changes in the performance of MS were characterized in terms of particle size distribution, mineral composition, crystal structure, micro-morphological features, and chemical bond composition, etc. The intrinsic connection between the changes in the particle size distribution of the particle group and the activity index was quantitatively characterized by using grey correlation analysis. The changes in the morphology features and the chemical bond composition of MS were analyzed by using scanning electron microscopy and Fourier transform infrared spectroscopy. The study results show that when the mechanical grinding time is gradually extended, the activity index shows different trends in different curing ages. The activity index was highest at 80 min of mechanical grinding, with 196.08 %, 236.98 %, and 420.37 % at 3 d, 7 d, and 28 d, respectively. In the particle size distribution of MS, the fluctuation of particle content in the range of 20–45 μm particle size had the greatest effect on the activity index. Mechanical grinding did not change the original mineral phase species in MS. After 40 min of mechanical grinding, the diffraction peak half-height width of MS mineral crystals increased, the grain size decreased, and the crystallinity of crystals decreased significantly, and these changes were the intrinsic factors for the improvement of the activity index. Mechanical grinding process has a considerable impact on the particle morphology of the MS, 60 min ground MS internal particle agglomeration phenomenon. The infrared spectral peak shapes of MS under different grinding time were consistent. The results can provide a reference for promoting the resource utilization of MS in mine filling.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142081"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of ethylenediaminetetraacetic acid on the properties of accelerated carbonated steel slag as supplementary cementitious materials 乙二胺四乙酸对加速碳化钢渣辅助胶凝材料性能的影响
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142093
Yichao Zhang , Jinxue Shan , Zhongcheng Ma , Zhicheng Liu , Jian Huang , Yanfeng Fang
{"title":"Effects of ethylenediaminetetraacetic acid on the properties of accelerated carbonated steel slag as supplementary cementitious materials","authors":"Yichao Zhang ,&nbsp;Jinxue Shan ,&nbsp;Zhongcheng Ma ,&nbsp;Zhicheng Liu ,&nbsp;Jian Huang ,&nbsp;Yanfeng Fang","doi":"10.1016/j.conbuildmat.2025.142093","DOIUrl":"10.1016/j.conbuildmat.2025.142093","url":null,"abstract":"<div><div>The poor volume stability of steel slag seriously restricts its large-scale application in engineering. To address this issue, this paper proposes a semi-dry carbonation process assisted by ethylenediaminetetraacetic acid (EDTA). The mineral composition, microstructure, compressive strength, and volume stability of carbonated steel slag were studied through X-ray diffraction, scanning electron microscopy, compressive strength, and expansion tests. The results showed that CO<sub>2</sub> uptake increased with carbonation time, reaching 3.93 % at an EDTA concentration of 0.1 g/L. EDTA accelerated calcium leaching and catalyzed carbonation reactions via chelation. The primary carbonation product was calcite, while the generated calcium carbonate (CaCO<sub>3</sub>) and calcium silicate hydrate (C-S-H) acted as nucleation sites for tricalcium silicate (C<sub>3</sub>S) hydration, thereby enhancing cement hydration. Additionally, the compressive strength of cementitious materials containing EDTA improved, and carbonation significantly enhanced the volume stability of steel slag, with the degree of improvement positively correlated to the carbonation degree. These findings demonstrate that the EDTA-assisted semi-dry carbonation process effectively enhances the carbonation efficiency of steel slag.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142093"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact-echo for different level cracks detection in concrete with artificial intelligence based on un/supervised deep learning 基于无监督深度学习的人工智能混凝土不同层次裂缝检测的冲击回波
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142080
Jeero Pandum , Katsufumi Hashimoto , Takafumi Sugiyama , Wanchai Yodsudjai
{"title":"Impact-echo for different level cracks detection in concrete with artificial intelligence based on un/supervised deep learning","authors":"Jeero Pandum ,&nbsp;Katsufumi Hashimoto ,&nbsp;Takafumi Sugiyama ,&nbsp;Wanchai Yodsudjai","doi":"10.1016/j.conbuildmat.2025.142080","DOIUrl":"10.1016/j.conbuildmat.2025.142080","url":null,"abstract":"<div><div>Maintaining aging concrete infrastructure, such as bridges and tunnels, is crucial for ensuring safety and extending service life. Appropriate inspections and maintenance are strongly demanded for detecting crack formation, spalling, and steel reinforcement corrosion, preventing severe damage. In particular, invisible internal cracks compromise structural integrity, requiring timely detection. Non-destructive testing (NDT) techniques such as the impact-echo method, which is simple to apply, are commonly used to evaluate interior defects, mainly in reinforced concrete structures. However, conventional methods often expect specialized expertise to interpret complex data accurately, which can be time-intensive and costly. To address this current situation, this study integrates AI with impact-echo data, using supervised deep learning models to analyze and classify multiple crack levels, including intact specimens, based on FFT-transformed data for providing better accuracy. Meanwhile, supervised learning faces challenges in collection of data set from concrete structures in real environment, where labeling internal crack damage on actual structures is impractical due to unknown damage locations and characteristics. To overcome the operational limitation, unsupervised learning with an Auto-Encoder (AE) and Maximum Squared Error (MaXSE) is proposed as an alternative approach to enable the detection of internal crack levels based on abnormal indices without data labelling.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142080"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of pretreated waste glass sand on comprehensive performance of concrete based on mechanical properties, durability, and microstructure 预处理废玻璃砂对混凝土力学性能、耐久性和微观结构综合性能的影响
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.141963
Minjae Son , Gyuyong Kim , Hamin Eu , Yaechan Lee , Sasui Sasui , Sujeong Pyeon , Sangkyu Lee , Jeongsoo Nam
{"title":"Effect of pretreated waste glass sand on comprehensive performance of concrete based on mechanical properties, durability, and microstructure","authors":"Minjae Son ,&nbsp;Gyuyong Kim ,&nbsp;Hamin Eu ,&nbsp;Yaechan Lee ,&nbsp;Sasui Sasui ,&nbsp;Sujeong Pyeon ,&nbsp;Sangkyu Lee ,&nbsp;Jeongsoo Nam","doi":"10.1016/j.conbuildmat.2025.141963","DOIUrl":"10.1016/j.conbuildmat.2025.141963","url":null,"abstract":"<div><div>This study investigated the effects of waste glass sand (GS) pretreatment on the mechanical properties, durability, and microstructure of concrete. Concrete specimens were prepared using natural sand (NS), untreated GS, and pretreated GS (TS) as 100 % fine aggregate replacements. The mechanical properties, including compressive strength, flexural strength, direct tensile strength, and static and dynamic moduli of elasticity, were evaluated. Additionally, the durability, such as drying shrinkage, freeze-thaw resistance, rapid chloride permeability, and accelerated carbonation resistance, were analyzed. The results indicate that TS enhances the interfacial bonding by modifying the smooth surface and angular shape characteristics of GS, thus improving the mechanical properties of concrete by 28 % at the maximum. The characteristics of GS contribute favorably to the pore structures for reducing drying shrinkage and enhancing freeze–thaw resistance. Furthermore, calcium silicate hydrate (C-S-H) formed via pozzolanic reactions enhances the chloride penetration resistance and long-term carbonation resistance of GS-containing concrete. Conversely, the C-S-H reaction products on the TS surface promote pore formation, thus resulting in the highest porosity among the specimens. This reduces the positive effects of TS on the drying shrinkage, chloride penetration resistance, and carbonation resistance compared with using GS. However, a comprehensive evaluation of TS demonstrates its significant potential as a sustainable sand replacement for concrete applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 141963"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of concrete strength and pore structure evolution under freeze-thaw-corrosion based on fractal dimension 基于分形维数的冻融腐蚀下混凝土强度与孔隙结构演化研究
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.141952
Haizhen Guo , Rongling Zhang , Yanshuai Wang , Weichen Xu , Xiaoping Wang , Wenjing Zhang
{"title":"Study of concrete strength and pore structure evolution under freeze-thaw-corrosion based on fractal dimension","authors":"Haizhen Guo ,&nbsp;Rongling Zhang ,&nbsp;Yanshuai Wang ,&nbsp;Weichen Xu ,&nbsp;Xiaoping Wang ,&nbsp;Wenjing Zhang","doi":"10.1016/j.conbuildmat.2025.141952","DOIUrl":"10.1016/j.conbuildmat.2025.141952","url":null,"abstract":"<div><div>To investigate the effect of freeze-thaw-sulfate coupled erosion on the microscopic pore structure of concrete, this study simulates the on-site freeze-thaw corrosion environment to carry out erosion tests based on the actual environmental conditions in Wuwei of Gansu Province. The pore characteristics under different erosion cycles were characterized by nuclear magnetic resonance (NMR) techniques, and the fractal dimensions of the gel pores, transitional pores, capillary pores, and large pores were quantified by combining <em>T</em><sub><em>2</em></sub> spectra with fractal theory. The evolution of the erosion resistance coefficient with erosion time was revealed through macroscopic tests, and the correlation models of fractal dimension, porosity with erosion resistance coefficient and pore tortuosity were established to verify the strength-porosity relationship through data fitting. The results show that the compressive strength and erosion resistance coefficient show a tendency to increase and then decrease with the increase of the number of coupled erosion. During the erosion process, the small pores inside the concrete continued to deteriorate and gradually connect to form large pores, the porosity showed a trend of decreasing and then increasing, and the pore volume ratio was transitional pores&gt;gel pores&gt;capillary pores&gt;large pores in order. The pore tortuosity showed an increasing and then decreasing trend, with a significant negative correlation with porosity (R<sup>2</sup>=0.9806), and a positive correlation with compressive strength and erosion resistance coefficient. The capillary fractal dimension tends to increase and then decrease and has the highest correlation coefficient with strength. The research results can provide a reference for the application of concrete in alpine saline soil areas.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 141952"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of inclination angle on the failure behavior and mechanism of cement-coal composites 倾角对水泥-煤复合材料破坏行为及机理的影响
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142030
Xuewei Liu , Chuang Jia , Bin Liu , Yongshui Kang , Quansheng Liu , Lei Zhu , Youqi Huang
{"title":"Influence of inclination angle on the failure behavior and mechanism of cement-coal composites","authors":"Xuewei Liu ,&nbsp;Chuang Jia ,&nbsp;Bin Liu ,&nbsp;Yongshui Kang ,&nbsp;Quansheng Liu ,&nbsp;Lei Zhu ,&nbsp;Youqi Huang","doi":"10.1016/j.conbuildmat.2025.142030","DOIUrl":"10.1016/j.conbuildmat.2025.142030","url":null,"abstract":"<div><div>Grouting reinforcement is a key technology to maintain the stability of deep coal mines, and cement is the most commonly used grouting material. To study the failure behavior and mechanism of cement-coal composites, uniaxial compression tests were carried out on composites with different inclination angles by combining acoustic emission (AE) and digital image correlation (DIC) techniques, and scanning electron microscope (SEM) tests. Results show that as <em>α</em> increases, the uniaxial compressive strength and AE <em>b</em>-value show a decreasing and then increasing trend (the minimum value corresponds to <em>α</em>=45°). Conversely, the cumulative AE counts and energy show an increasing and then decreasing characteristic. With the increase of <em>α</em>, the failure mode transitions from tensile-dominated to tensile-shear mixed mode, and the type of microcracks transitions from tensile-dominated to tensile-shear composite type. Moreover, Numerical simulations show that the stress concentration zone migrates from the coal matrix to the cement-coal interface with the increase of <em>α</em>, which is consistent with the main strain characteristics of DIC. SEM results show that as <em>α</em> increases (0°∼30°), the microporosity at the cement-coal composite interface is increasing. At high angles (<em>α</em>≥45°), continuous shear friction zones develop, and hydration products undergo localized fragmentation. Finally, the inclination angle control mechanism for cement-coal composites' mechanical properties were discussed.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142030"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synergistic mechanism and performance enhancement of fly ash-slag-based geopolymer with sodium tetraborate and aminopropyltriethoxysilane for retardation 粉煤灰-矿渣基地聚合物与四硼酸钠和氨基丙基三乙氧基硅烷的协同缓凝机理及性能增强
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142055
Hang Yu , Yongqi Zhou , Wenjing Xia , Tao Xu
{"title":"Synergistic mechanism and performance enhancement of fly ash-slag-based geopolymer with sodium tetraborate and aminopropyltriethoxysilane for retardation","authors":"Hang Yu ,&nbsp;Yongqi Zhou ,&nbsp;Wenjing Xia ,&nbsp;Tao Xu","doi":"10.1016/j.conbuildmat.2025.142055","DOIUrl":"10.1016/j.conbuildmat.2025.142055","url":null,"abstract":"<div><div>To enable the application of high-strength FASGG in cold asphalt pavement recycling by addressing its rapid setting behavior and the adverse effects of traditional retardation techniques on its performance. This study investigates the synergistic effect of sodium tetraborate (borax) and aminopropyltriethoxysilane (APTES) when used simultaneously as retarders in fly ash-slag-based geopolymer (FASGG). The mechanisms underlying setting time delay and mechanical performance enhancement are investigated, thereby broadening the practical application range of FASGG. Combining 3 % borax and 1 % APTES extends the setting time of FASGG by about 5.5 times. Comparatively, borax improves the flowability of FASGG, but APTES reduces its flowability. The addition of 3 % borax and 1 % APTES reduced the flowability by 13.3 %. The water retention of borax and hydrophilic groups of APTES enhances the retardation. APTES addition mitigates borax's adverse effects on mechanical strength, preserving FASGG's structural performance. Additionally, boron oxides and APTES molecules encapsulate precursors during the initial stage, slowing reactant dissolution and inhibiting hydration. In the presence of synergistic setting modifiers, the boron-oxide network interacts with Si–OH or Si–O–Si groups to enhance structural stability and contribute to a more pronounced delay in setting. The synergy between borax and APTES increases compactness and uniformity of FASGG. These results confirm that combining borax and APTES effectively delays FASGG’s setting time while improving their overall macroscopic performance, offering a viable solution to overly rapid setting.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142055"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In-plane seismic retrofitting of damaged masonry walls using steel components and polymer modified cement mortar strips 用钢构件和聚合物改性水泥砂浆条对受损砌体墙体进行面内抗震加固
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142022
Shandong Yang , Lidong Zhao , Qiyun Qiao , Hongbo Liu , Wanlin Cao
{"title":"In-plane seismic retrofitting of damaged masonry walls using steel components and polymer modified cement mortar strips","authors":"Shandong Yang ,&nbsp;Lidong Zhao ,&nbsp;Qiyun Qiao ,&nbsp;Hongbo Liu ,&nbsp;Wanlin Cao","doi":"10.1016/j.conbuildmat.2025.142022","DOIUrl":"10.1016/j.conbuildmat.2025.142022","url":null,"abstract":"<div><div>In this study, a novel retrofitting method utilizing steel components, polymer modified cement mortar, and ordinary mortar was applied to retrofit damaged masonry wall specimens. The specimens included one unreinforced masonry (URM) wall specimen and three confined masonry (CM) wall specimens, with the confined walls utilizing different types of tie-columns: channel steel-mortar, single reinforcing steel-mortar, and reinforced concrete. First, the four masonry walls were tested in the original (pre-damaged) state and were subsequently retrofitted using the proposed method. The seismic experiments on retrofitted walls were then conducted. The results showed that the steel components-mortar composite retrofitting method could effectively enhance the seismic performance of the damaged specimens. The polymer modified cement mortar strips exhibited the highest average contribution in the retrofitted components. Specifically, the peak load of the retrofitted specimens increased by 30 %-112 %. The retrofitting also contributed to noticeable recovery in initial stiffness and enhanced energy dissipation capacity. In addition, the confining effect of the tie-columns significantly improved the specimen performance after retrofitting. After retrofitting, compared to the retrofitted unreinforced masonry wall, the peak load of the confined masonry walls increased by 105 %-213 %. The single reinforcing steel-mortar tie columns showed an excellent confining effect, providing an economical and effective alternative solution for tie-column. Finally, the calculation equations for shear bearing capacity before and after retrofitting were proposed, which exhibited good agreement with the experimental results.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142022"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sustainable synthesis of hydrophobic waste glass powder for enhanced water and frost resistance in mortar 提高砂浆耐水性和抗冻性的疏水性废玻璃粉的可持续合成
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142097
Juncheng Wen , Yan Wan , Yingzi Yang
{"title":"Sustainable synthesis of hydrophobic waste glass powder for enhanced water and frost resistance in mortar","authors":"Juncheng Wen ,&nbsp;Yan Wan ,&nbsp;Yingzi Yang","doi":"10.1016/j.conbuildmat.2025.142097","DOIUrl":"10.1016/j.conbuildmat.2025.142097","url":null,"abstract":"<div><div>Most durability issues in cement-based materials stem from water intrusion, which can be mitigated by hydrophobic materials with excellent waterproofing properties. This study proposes a green wet chemical method using stearic acid (SA) and waste glass powder (WGP) to synthesize hydrophobic WGP (HWGP). The effect of SA dosage on the water contact angle of HWGP was investigated, and the optimal SA dosage for preparing HWGP was determined through TG analysis. XRD, FTIR, XPS, and TEM tests revealed the synthesis mechanism of HWGP. The effects of HWGP on mortar's mechanical properties, water and frost resistance were also studied, and the optimal dosage of HWGP for preparing hydrophobic mortar was determined. The results show that 8 % SA is optimal for preparing HWGP, and its water contact angle is 132.2°. The synthesis occurs through reactions between SA and Na<sup>+</sup>, Ca<sup>2+</sup>, and Si-OH groups, with the long carbon chains of SA grafted onto WGP, forming a hydrophobic layer about 4 nm thick. As HWGP content increases, compressive strength initially increases and then decreases, while water and frost resistance improve significantly. The optimal dosage for preparing hydrophobic mortar is 15 % HWGP, where compressive strength decreases by only 6.9 %, flexural strength increases by 12.5 %, and water contact angle increases by 91.2°. Additionally, initial and secondary water absorption rates decrease by 79.4 % and 92.2 %, respectively, total water absorption amount over 8d decreases by 64.9 %, and frost resistance improves by 70.9 %.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142097"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of flexural fatigue damage and micro-mechanisms of nano-SiO2 modified recycled aggregate concrete 纳米sio2改性再生骨料混凝土弯曲疲劳损伤及微观机理分析
IF 7.4 1区 工程技术
Construction and Building Materials Pub Date : 2025-06-03 DOI: 10.1016/j.conbuildmat.2025.142004
Xianggang Zhang , Liuyang Wang , Youchuan Shen , Jianfei Liu , Yuhui Fan
{"title":"Analysis of flexural fatigue damage and micro-mechanisms of nano-SiO2 modified recycled aggregate concrete","authors":"Xianggang Zhang ,&nbsp;Liuyang Wang ,&nbsp;Youchuan Shen ,&nbsp;Jianfei Liu ,&nbsp;Yuhui Fan","doi":"10.1016/j.conbuildmat.2025.142004","DOIUrl":"10.1016/j.conbuildmat.2025.142004","url":null,"abstract":"<div><div>Converting demolition waste into recycled coarse aggregate (RCA) for recycled aggregate concrete (RAC) is an effective, sustainable method. However, the engineering application of RCA is substantially restricted owing to its high porosity and water absorption. This study proposes a nano-SiO₂ immersion method to enhance RCA fatigue performance and microstructure. Based on varying parameters including RCA replacement ratios (0 %, 50 %, 100 %), nano-SiO<sub>2</sub> solution concentrations (0 %, 0.5 %, 1 %), immersion durations (24 h, 48 h), and stress levels (0.60, 0.65, 0.70), specimens were prepared for comprehensive flexural fatigue testing and microstructural mechanism analysis. This research focused on analyzing the characteristic variations of flexural fatigue strain and fatigue modulus in nano-SiO<sub>2</sub> modified RAC subjected to multiple stress levels. The progression patterns of fatigue damage were thoroughly analyzed, and a corresponding damage evolution model was developed. The experimental results revealed that nano-SiO₂ immersion treatment (optimal: 1 %, 48 h) significantly enhances RAC performance. Nano-SiO₂ modified RAC's flexural fatigue strain and modulus show a three-stage evolution. A fatigue damage model using flexural fatigue modulus as the variable can predict damage. The damage progression was significantly influenced by stress levels and replacement ratios, showing accelerated deterioration with their increase. Conversely, higher nano-SiO<sub>2</sub> solution concentrations and extended immersion durations effectively mitigated damage development. Nano-SiO₂ modifies mortar's chemical composition, reduces CH content and optimizes ITZ. Specimen R-100–0.5–48 has a 14.62 % porosity reduction. The findings are anticipated to provide fundamental insights and technical support for advancing both theoretical understanding and practical applications of nano-SiO<sub>2</sub> modified RAC in engineering structures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"487 ","pages":"Article 142004"},"PeriodicalIF":7.4,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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