Construction and Building Materials最新文献

{"title":"Influence of magnesium oxychloride cement mortar with different strength grades: Fly ash as compensation material","authors":"Weixin Zheng ,&nbsp;Jing Wen ,&nbsp;Baolan Li ,&nbsp;Jinmei Dong ,&nbsp;Chenggong Chang ,&nbsp;Yuanrui Li ,&nbsp;Qiang Wang","doi":"10.1016/j.conbuildmat.2024.139354","DOIUrl":"10.1016/j.conbuildmat.2024.139354","url":null,"abstract":"<div><div>Magnesium oxychloride cement (MOC) is widely used due to its high solid waste utilization efficiency. However, the demand for cement raw materials (MgO and MgCl₂) in the lower strength gradation remains low, leading to excessive sand particles in the slurry, thus reducing the working performance of the MOC mortar. Fly ash (FA) has been used in the construction industry to improve the workability of the slurry. The focus and innovation of this work involved using FA as a compensation material to produce MOC mortar materials with different strength levels. In this study, FA was used as compensation material to form MOC mortar with different strength grades, and the effects of FA on the MOC mortar flow performance, setting time, hydration heat release, strength development, phase composition, pore structure, and micromorphology were investigated. Combined with the experimental analysis and referring to the strength grade law of silicate concrete, the grade classification of MOC mortar with FA as the compensation material could be simply divided by adding 20 %, 30 %, 40 %, and 50 % FA, which could serve as a reference for the use design of MOC in different environments.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139354"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745461","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}

{"title":"Rejuvenation performance and mechanism of aged SBS modified asphalt rejuvenated by bio-oil based rejuvenators","authors":"Jiaomin Huo ,&nbsp;Xiao Zhang ,&nbsp;Fang Liu ,&nbsp;Yufeng Liu ,&nbsp;Yanfeng Niu ,&nbsp;Hengji Zhang ,&nbsp;Pengyuan Liu","doi":"10.1016/j.conbuildmat.2024.139366","DOIUrl":"10.1016/j.conbuildmat.2024.139366","url":null,"abstract":"<div><div>To further understand the performance and mechanism of bio-oil based rejuvenators during hot recycling with high-content reclaimed styrene-butadiene-styrene (SBS) modified asphalt pavement (RAP-SBS), three kinds of bio-oil based rejuvenators (R1: waste edible oil (WEO), R2: WEO and SBS compound, R3: WEO and reactive agent compound) with different dosages (4 %, 8 %, and 12 %) were used to prepare rejuvenated SBS modified asphalt in this study. Dynamic shear rheometer (DSR) and bending beam rheometer (BBR) were used to study the rheological performances at high, medium, and low temperatures. Fluorescence microscopy (FM) and Fourier transform infrared (FT-IR) spectroscopy were utilized to reveal the rejuvenation mechanisms. The results show that R1 mitigates the agglomeration of aged SBS, and its rejuvenated asphalts have inferior permanent deformation resistance and superior elastic recovery ability but insufficient stress relaxation at extremely low temperatures. R2 can supplement the SBS phase while the ability to repair the network structure is limited, and the permanent deformation resistance of its rejuvenated asphalts is the best. R3 can effectively restore the network structure through chemical reactions. Its rejuvenated asphalts exhibit the best resistance to fatigue cracking. Also, they can significantly improve the speed of viscoelastic flow to release shrinkage stress at low temperatures. Based on the rheological performances of rejuvenated asphalts, utilizing the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) analysis, the recommended dosages are R2 at 12 %, and R3 at 8 %.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139366"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745464","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}

{"title":"Rheological properties of cement paste with in-situ polymerization of sodium acrylate: Roles of polymerization and hydration","authors":"Binmeng Chen,&nbsp;Bin Xu,&nbsp;Zhaoyang Sun","doi":"10.1016/j.conbuildmat.2024.139381","DOIUrl":"10.1016/j.conbuildmat.2024.139381","url":null,"abstract":"<div><div>In-situ polymerization modified cement paste shows a great potential in 3D concrete printing (3DCP) due to its enhanced rheological properties. Unlike direct adding conventional polymer, how in-situ polymerization and cement hydration synergistically regulate the rheology of cement paste with different monomer dosages remains unclear. Here, we investigate the rheological properties of in-situ polymerization modified cement paste with different dosages of sodium acrylate (SA) to reveal the roles of cement hydration and polymerization. When the monomer dosage is lower (1 % and 3 %), the polymerization inhibits the cement hydration without providing sufficient contribution to the structural development of cement paste, resulting in the decreased rheological properties, such as static/dynamic yield stress and structural build-up rate. On the contrary, once the monomer dosage reaches a higher level (5 % and 7 %), the resultant polymers can gradually form a network interwinding within the cement particles, thus leading to enhanced rheological properties, regardless of the more severely inhibited cement hydration.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139381"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745394","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}

{"title":"Enhanced heavy metal immobilization in cementitious materials through CO2 mineralization: A kinetic analysis and physicochemical evolution","authors":"Xinyu Zhu,&nbsp;Tao Wang,&nbsp;Zhenwei Yi,&nbsp;Zitao Yu,&nbsp;Kun Luo,&nbsp;Xiang Gao","doi":"10.1016/j.conbuildmat.2024.139363","DOIUrl":"10.1016/j.conbuildmat.2024.139363","url":null,"abstract":"<div><div>The leaching of heavy metals (HMs) from industrial solid waste during its treatment and utilization has garnered extensive attention within the scientific community. The incorporation of cementitious materials to both consume waste and immobilize HMs within the construction sector is a promising strategy. Traditional suppression techniques, employing additives, incur higher costs and may adversely affect the mechanical performance of cement. This research introduces a CO₂ mineralization technology synergistically enhancing the immobilization of HMs, which inhibiting the leaching channels in cement-based materials and strengthening the chemical chelation of HMs, thereby suppressing their leaching. The results indicated that the cementitious materials, with a carbonation rate of 10 %-12 %, demonstrated enhanced physical adsorption and chemical chelation capabilities, achieving a 98 % reduction in Pb leaching and a decrease of over 50 % for Mn. Conversely, the post-mineralization reduction in free Ca²⁺ ions adversely affected the immobilization of soluble HMs like Cr(VI). Overall, this study aimed to enhance the efficacy of current methods for utilizing solid waste and sequestrating HMs whilst simultaneously pioneering innovative concepts for the mineralization application of cement-based materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139363"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745370","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}

{"title":"Utilization of copper tailings in the preparation of low-calcium Portland cement clinker and carbonation-hardening mechanism","authors":"Tianrui Pei ,&nbsp;Yan Zheng ,&nbsp;Yali Wang ,&nbsp;Dajiang Zhang ,&nbsp;Peng Zhang ,&nbsp;Suping Cui ,&nbsp;Yongchao Zheng ,&nbsp;Sixue Zhao","doi":"10.1016/j.conbuildmat.2024.139362","DOIUrl":"10.1016/j.conbuildmat.2024.139362","url":null,"abstract":"<div><div>This study presents a strategy for decreasing cement-production-induced CO₂ emissions and achieving comprehensive utilization of copper tailings (CTs). This is realized by preparing Portland cement clinkers dominated by calcium silicate minerals with a low Ca/Si ratio through the adjustment of the siliceous (CTs) to calcareous (limestone) material ratio. Differential scanning calorimeter (DSC), quantify X-ray diffraction (QXRD), scanning electron microscopy (SEM), ²⁹Si nuclear magnetic resonance (NMR), and thermogravimetric (TG) analyses were employed to systematically characterize the thermodynamic behavior and mineral composition changes during the formation of the low-calcium Portland cement clinker, and to analyze their mechanical properties, carbonation products, and microstructural evolution under accelerated carbonation conditions (high pressures and CO₂ concentration). CTs used as siliceous raw materials enabled the preparation of the low-calcium Portland cement clinkers with wollastonite (CS), belite (C₂S), and rankinite (C₃S₂) as the main mineral phases at 1200 °C. The Ca/Si ratio and calcination temperature markedly influenced the clinker minerals. For a Ca/Si ratio of ≤1.0, CS was the main clinker mineral. When the Ca/Si ratio was between 1.0 and 1.4, the clinker comprised the C₂S–C₃S₂ system, with the C₃S₂ content increasing as the calcination temperature increased. The prepared clinker achieved a compressive strength of over 100 MPa after carbonation when calcined at 1200°C with a Ca/Si ratio of 1.4. Carbonation of several low-calcium-content silicate minerals produced CaCO₃, mainly as spherical vaterite crystals, while silica in the system formed silica gel, which formed a reticulated structure with CaCO₃.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139362"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745400","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}

{"title":"Adhesion behavior and microscopic mechanism of epoxy asphalt-RAP aggregate interface","authors":"Zhiyong Shi ,&nbsp;Zhaohui Min ,&nbsp;Fei Chen ,&nbsp;Wei Huang","doi":"10.1016/j.conbuildmat.2024.139361","DOIUrl":"10.1016/j.conbuildmat.2024.139361","url":null,"abstract":"<div><div>The utilization of thermosetting epoxy asphalt shows promise in achieving the objective of efficient recycling of reclaimed asphalt pavement (RAP) and promoting the sustainable development of pavement engineering. However, the adhesion behavior and microscopic mechanism of the multi-phase complex interface of epoxy asphalt-RAP aggregate is not clear, which is not conducive to the application of epoxy asphalt in RAP. In this paper, epoxy asphalt-aged asphalt (EA)-aggregate specimens were prepared to simulate the epoxy asphalt-RAP aggregate interface. The effects of different factors on adhesion performance indicators such as surface performance, shear performance and dynamic mechanical performance of the interface were evaluated. The grey relation analysis was used to clarify the sensitivity of interface adhesion performance indicators to different factors. Finally, the microscopic mechanism of interface adhesion behavior was revealed. The results showed that the increase in the epoxy component content and the degree of blending (DOB) of the EA improved the surface characteristics, shear performance, and dynamic mechanical performance of the interface, contributing to interface tends to adhesion failure, which was contrary to the aging effect of asphalt and water immersion. Noteworthy, adding the epoxy component exacerbated the gradient distribution of the EA with partial blending, and the enhancement effect on the interface deformability was significantly weakened. Especially for the range of shear strain growth rate of the EA-30P-granite interface decreased to 15.21 %∼27.61 %. Besides, the adhesion performance of the interface with different aggregates showed a similar pattern. The surface characteristics and dynamic mechanical performance of the interface were more sensitive to aggregate type and DOB, while the top-ranking influencing factors were epoxy component content and DOB for interface shear performance. Increasing the epoxy component content and DOB contributed to the integrity of the microstructural morphology of the epoxy component, but the aging of asphalt had the opposite pattern.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139361"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745243","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}

{"title":"Evaluating the effect of reclaimed asphalt pavement on rubberized hot mix asphalt in pilot projects","authors":"Angel Mateos ,&nbsp;Federico Gulisano ,&nbsp;John Harvey ,&nbsp;Kee Foo ,&nbsp;Jeffrey Buscheck ,&nbsp;Rongzong Wu ,&nbsp;Ali A. Butt ,&nbsp;Mohammad Rahman ,&nbsp;Tanoogna Mallarapu ,&nbsp;Brielle Moreno","doi":"10.1016/j.conbuildmat.2024.139359","DOIUrl":"10.1016/j.conbuildmat.2024.139359","url":null,"abstract":"<div><div>The study goal is to evaluate the use of up to 10 % reclaimed asphalt pavement (RAP) by aggregate replacement in rubberized hot mix asphalt-gap graded RHMA-G mixes to identify any significant potential problems for durability. Five pilot projects were built, each including a control RHMA-G (without RAP) and an RHMA-G with 10 % RAP. The mixes were sampled during production and evaluated using volumetric assessment, and performance related tests including stiffness, four-point bending fatigue resistance, fracture resistance measured with the IDEAL cracking test, and rutting resistance. Mix testing results indicate that the addition of 10 % RAP had minor effects on the mechanical properties. With a few exceptions related to the total binder content of the mixes, the effect of the RAP addition was negligible compared to normal production variability. Modeling with <em>CalME</em>, Caltrans mechanistic-empirical asphalt pavement design software and four-point bending testing results, indicated that RAP addition effects on pavement cracking performance were either negligible or comparable to mix-to-mix RHMA-G variability. Regarding constructability, RAP addition did not create any problems. The life cycle assessment completed in the study indicates that the addition of 10 % RAP to the RHMA-G can reduce the greenhouse gasses emissions associated with the RHMA-G production (cradle-to-gate) by up to 5 %.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139359"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745246","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}

{"title":"Mechanical properties and multiscale structure evolution of cement mortars under temperature cycling and low-humidity coupled condition","authors":"Yuanpeng Liu ,&nbsp;Hao Wang ,&nbsp;Zihao Liu ,&nbsp;Yuqing Xia ,&nbsp;Jiachen Yao ,&nbsp;Yanlong Ren ,&nbsp;Zhangli Hu ,&nbsp;Jiaping Liu","doi":"10.1016/j.conbuildmat.2024.139351","DOIUrl":"10.1016/j.conbuildmat.2024.139351","url":null,"abstract":"<div><div>The degradation of concrete induced by wide temperature differences and drying significantly impacts the durability of constructions in plateau regions. This study systematically investigated the mechanical properties, the structure evolution from nanoscale to macroscale, and the hydration product changes under temperature cycling with low relative humidity (5–60°C cycling, 30±5 % RH). Damage gradients were meticulously discussed based on the experimental measured thermal gradient and mechanical failure modes. Pore coarsening and microcracks which increased with w/c mainly occurred between 50 nm and 50 μm, becoming key factors contributing to the mechanical degradation. Nevertheless, the relatively small damages enable the mortar to maintain much stable mechanical properties than cement paste and concrete. The hydration and the small amount of decomposition had little effect on the structure. Overall, the strength increased until a certain time window followed by a decreasing trend because of two contradictory factors: enhancement led by the increase of capillary pressure and surface energy and degradation driven by the gradient damage.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139351"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745460","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}

{"title":"Reinforced mechanical properties and mechanism of oil-well cement by potassium hexatitanate whiskers","authors":"Xingjie Ling ,&nbsp;Tao Gu ,&nbsp;Gaoyin Zhang ,&nbsp;Xiangyang Zhuan ,&nbsp;Shilan Wang ,&nbsp;Li Yang ,&nbsp;Yongjun Deng ,&nbsp;Lihua Zhang ,&nbsp;Laibao Liu","doi":"10.1016/j.conbuildmat.2024.139371","DOIUrl":"10.1016/j.conbuildmat.2024.139371","url":null,"abstract":"<div><div>As the exploration and extraction of oil and gas resources extend to deeper formations, issues such as the brittleness of oil-well cement, leading to interlayer seal failure in oil and gas wells have become more prominent. This study examines the effects of potassium hexatitanate whiskers (PHW) as a new type of reinforcing material on the mechanical properties of oil-well cement and explores the mechanism of action. The experimental results showed that when the addition of PHW is 1 %, the compressive and splitting tensile strength of the cement paste at 7 days (d) were increased by 29.66 % and 45.83 %, respectively, compared to the virgin cement paste. Under uniaxial direct loading and cyclic loading conditions, PHW cement sample exhibits superior deformability and a lower elastic modulus, at the same time, it has higher energy dissipation capacity. Moreover, the addition of PHW optimized the pore structure and enhanced the compactness of the cement samples structure. Through the bridging, pulling out and crack deflection of PHW, the generation/expansion of micro-cracks was controlled, and the energy consumption by whiskers pulling out played the effect of reinforcing and toughening. This study provides a beneficial way to solve the problem of toughening and excessive brittleness of oil-well cement.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139371"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745466","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}

{"title":"Enhanced mechanical properties and chromium (VI) immobilization via defect-tailored UiO-66-(OH)2 in cement-stabilized iron tailings","authors":"Jian Jia ,&nbsp;Mei-Ling Xu ,&nbsp;Xiao-Jie Jiang ,&nbsp;Li-Na Zhang ,&nbsp;Xiao-Lei Lu ,&nbsp;Jiang Zhu ,&nbsp;Xin Cheng","doi":"10.1016/j.conbuildmat.2024.139324","DOIUrl":"10.1016/j.conbuildmat.2024.139324","url":null,"abstract":"<div><div>The utilization of cement-stabilized iron tailings as pavement base necessitates rigorous scrutiny of heavy metal ion leaching, particularly under fluctuating environmental pH conditions. Given the insufficient capacity of cement to stabilize Cr(Ⅵ), this paper explores the integration of defect-engineered metal-organic frameworks (MOFs) as additives in cement-stabilized iron tailings to reduce Cr(Ⅵ) leaching. Results shows that the utilization of MOFs material mitigates Cr(VI) leaching in cement-stabilized iron tailings while enhancing their mechanical properties. The Cr(Ⅵ) leaching from samples with the addition of UiO-66-(OH)₂ and UiO-66-(OH)₂-D exhibited a substantial reduction of 60.2 % and 88.6 %, respectively. The stabilized mechanism is attributed to the strong affinity between Cr(Ⅵ) and hydroxyl groups in MOFs. Furthermore, UiO-66-(OH)₂-D has a larger pore diameter to expose more hydroxyl groups, which greatly improves its adsorption performance for Cr(Ⅵ). Meanwhile, the unconfined compressive strength (UCS), splitting strength and compressive resilience modulus increased by 13.4 %, 35.1 % and 45.7 %, respectively. The mechanisms underlie that the MOFs enhanced the early hydration process and optimized of the pore size distribution within the solidified body. This study presents a viable and efficient approach for the sustained mitigation of Cr(Ⅵ) leaching within cement-stabilized iron tailings.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139324"},"PeriodicalIF":7.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745462","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}