Cement & concrete composites最新文献_第5页

Repetitive water replenishment in CO2 curing: Enhancement in carbon uptake, reactivity, crystal development, and mechanical properties of low calcium binder composites 二氧化碳固化过程中的重复补水：提高低钙粘结剂复合材料的碳吸收、反应性、晶体发育和机械性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-17 DOI: 10.1016/j.cemconcomp.2025.106053

Seongmin Cho, Heongwon Suh, Jaeyeon Park, Seonghoon Jeong, Jin Park, Sungchul Bae

{"title":"Repetitive water replenishment in CO2 curing: Enhancement in carbon uptake, reactivity, crystal development, and mechanical properties of low calcium binder composites","authors":"Seongmin Cho, Heongwon Suh, Jaeyeon Park, Seonghoon Jeong, Jin Park, Sungchul Bae","doi":"10.1016/j.cemconcomp.2025.106053","DOIUrl":"10.1016/j.cemconcomp.2025.106053","url":null,"abstract":"<div><div>Water plays a crucial role in the carbonation and phase evolution of low-calcium binders (LCBs) under a CO<sub>2</sub> curing environment. This study aimed to improve the mechanical properties of LCB composites through repetitive water replenishment during curing and investigate their impact on microstructural phase evolution and strength development. To assess the effect of the amount of water replenished, distilled water containing 5, 10, and 15 wt% of cement paste was introduced into the samples at 1, 3, 6, and 12 h during CO<sub>2</sub> curing. Water replenishment significantly improved the reaction degree of the LCB, resulting in a characteristic microstructure due to the distinctive CaCO<sub>3</sub> growth. Notably, the samples with water replenishment exhibited a substantial increase in compressive strength, up to two times higher than those without water supplementation, after 24 h of curing. Therefore, the addition of water to LCB composites during CO<sub>2</sub> curing enhances the chemical reactions and refines the microstructure.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106053"},"PeriodicalIF":10.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640567","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

Carbonation of natural fibers reinforced MgO-SiO2 (NFs-MS) composites

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-17 DOI: 10.1016/j.cemconcomp.2025.106052

Bo Wu, Jishen Qiu

{"title":"Carbonation of natural fibers reinforced MgO-SiO2 (NFs-MS) composites","authors":"Bo Wu, Jishen Qiu","doi":"10.1016/j.cemconcomp.2025.106052","DOIUrl":"10.1016/j.cemconcomp.2025.106052","url":null,"abstract":"<div><div>The heavy reliance of reactive magnesia cement (RMC) on CO<sub>2</sub> sources to gain sufficient mechanical strength limits its productivity. The present work developed natural fibers reinforced MgO-SiO<sub>2</sub> (NFs-MS) composites, in which the formation of magnesium-silicate-hydrate (M-S-H) yielded sufficient early strength (e.g., >30 MPa), and subsequent carbonation of residual brucite enabled continuous strength development (e.g., >70 MPa). The presence of NFs in MS composites not only accelerates the strength gain under moisture curing and subsequent carbonation curing, but also effectively improves the volume stability and CO<sub>2</sub> sequestration. Moreover, carbonation curing densified the fiber-matrix interface zone, leading to improved fiber-matrix interfacial properties and tensile performance. The results from aqueous carbonation test show that the synthetic M-S-H has greater chemical stability compared to MgO/brucite. However, partial leaching of Mg<sup>2+</sup> from M-S-H was also observed, implying the carbonation potential of M-S-H phase. These findings suggest that NFs-MS composites hold great potential to be directly applied in load-bearing structures without requirement for special CO<sub>2</sub> pre-curing.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106052"},"PeriodicalIF":10.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640566","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

Investigation of mechanical properties and damage characterization of cement pastes prepared by coupled carbonation-hydration curing 碳化-水化耦合固化法制备的水泥浆的力学性能和损伤特征研究

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-17 DOI: 10.1016/j.cemconcomp.2025.106049

Qinglong Qin , Boyang Su , Zihan Ma , Rui Sun , Peiliang Shen , Jiangshan Li , Chi Sun Poon

{"title":"Investigation of mechanical properties and damage characterization of cement pastes prepared by coupled carbonation-hydration curing","authors":"Qinglong Qin , Boyang Su , Zihan Ma , Rui Sun , Peiliang Shen , Jiangshan Li , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106049","DOIUrl":"10.1016/j.cemconcomp.2025.106049","url":null,"abstract":"<div><div>To achieve carbon reduction, a coupled carbonation-hydration curing approach has been developed. This study employs the acoustic emission (AE) technique to analyze the mechanical properties and damage characterization of cement paste under this curing method. Microscopic techniques clarify the evolution of products, microstructures and micromechanical parameters, highlighting their impact on mechanical behavior. Results indicate that the carbonation-hydration equilibrium is achieved when the ratio of CaCO<sub>3</sub> to amorphous content is less than 2. In this system, C-S-H gels are predominantly formed, while the CaCO<sub>3</sub> content remains minimal. At the balance system, the compressive strength increases by 4.16 %–16.25 %, while the pore volume in the range of 1–200 nm decreases by 13.19 %–19.54 % compared to standard curing. Conversely, the ratio greater than 2 results in over-carbonation, with CaCO<sub>3</sub> as the dominant product and few C-S-H gels. In the over-carbonation system, the compressive strength and pore volume in the range of 1–200 nm decrease by 13.21 %–34.62 % and 21.55 %–40.85 %, respectively, compared to standard curing. Under coupled carbonation-hydration curing, cement pastes exhibit significant stress instability, with damage primarily from tensile cracks in the balanced systems and mixed shear-tensile or tensile cracks in the over-carbonated systems.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106049"},"PeriodicalIF":10.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640572","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

The role of water during the middle or later periods of Class F fly ash-based geopolymerization 水在 F 级粉煤灰基土工聚合中后期的作用

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-15 DOI: 10.1016/j.cemconcomp.2025.106045

Xiaonan Ge , Yiming Zhang , Xiang Hu , Minjie Wen , Caijun Shi

{"title":"The role of water during the middle or later periods of Class F fly ash-based geopolymerization","authors":"Xiaonan Ge , Yiming Zhang , Xiang Hu , Minjie Wen , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106045","DOIUrl":"10.1016/j.cemconcomp.2025.106045","url":null,"abstract":"<div><div>The free water in the interconnected pores plays a significant role in supporting the development of fly ash-based geopolymerization reactions during the middle and later periods of the process. In this paper, the free water loss and mechanical properties of geopolymers within the different curing methods were tested. Through the analysis of X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), and low-field nuclear magnetic resonance (NMR) results, the differential tendencies of micro-characteristics were observed. In the period of 28–56 days, the main reactive modes probably evolved into the continuous generation of oligomers that increase the amorphous phase content (APC) and the polycondensation between formed geopolymer binders and oligomers that promotes the optimization of Si/Al molar ratio and porosity. The varied free water content led to the change in the alkalinity of the pore solution that acted on the geopolymerizaiton, and the physical actions of water, including softening, lubrication, and drying shrinkage, also affected the mechanical performance of specimens. The research found that the remaining water content composed of the trapped and free water showed a threshold of at least 6.40 %, lower than which the geopolymerization would be suspended. In general, the phenomenon of differentiation and regression of mechanics indicates that the variation of water content with limits can only impact the geopolymerization in a relatively short period.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106045"},"PeriodicalIF":10.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631262","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

Synthesis of geopolymer composites utilizing PVA-modified basalt fibers and foundry waste: Fundamental properties, cracking resistance and fracture toughness

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-15 DOI: 10.1016/j.cemconcomp.2025.106046

Yuwei Zhang, Chengliang Zhou, Yafeng Gong, Fei Wu, Yuheng Liu, Jiaxiang Song, Fuyu Wang

{"title":"Synthesis of geopolymer composites utilizing PVA-modified basalt fibers and foundry waste: Fundamental properties, cracking resistance and fracture toughness","authors":"Yuwei Zhang, Chengliang Zhou, Yafeng Gong, Fei Wu, Yuheng Liu, Jiaxiang Song, Fuyu Wang","doi":"10.1016/j.cemconcomp.2025.106046","DOIUrl":"10.1016/j.cemconcomp.2025.106046","url":null,"abstract":"<div><div>Coal gangue/slag-based geopolymer composites (CSGC) have garnered significant attention in sustainable construction due to their low-carbon footprint, but their high brittleness remains a critical limitation. This study addresses this challenge by modifying basalt fiber (BF) with polyvinyl alcohol (PVA) to enhance CSGC. A novel porosity detection program, with an average accuracy exceeding 98 % for pores larger than 10 pixels (0.4 mm), was developed to analyze pore evolution. Combined with a multi-scale testing approach, the study evaluates shrinkage, fracture toughness, compressive strength, and flexural strength of fiber-reinforced CSGC. Results revealed that PVA coating enhanced fiber-CSGC matrix bonding via chemical crosslinking, such as O-Al-O bonds, and mechanical interlocking, achieving 15.9 % and 19.1 % improvements in the 28-d flexural and compressive strength of modified basalt fibers (MBF)-reinforced CSGC, respectively. Acoustic emission (AE) analysis indicated that fibers shifted the dominant cracking mode from shear to a mixed tensile-shear mode (20.99 % tensile cracks), thereby enhancing CSGC toughness. Moreover, double-K fracture model analysis, based on digital image correlation (DIC) test results, confirmed that MBF outperforms unmodified fibers in toughening effects, with increases of 50.0 % and 32.4 % in initiation and unstable fracture toughness, respectively. This study presents an effective strategy for reducing brittleness in geopolymers through interface-engineered fiber reinforcement, which is expected to promote the development of high-performance, sustainable construction materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106046"},"PeriodicalIF":10.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627651","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 surface carbonation on the electrochemical chloride extraction of recycled aggregate concrete and sensitivity analysis 表面碳化对再生骨料混凝土电化学提取氯化物的影响及敏感性分析

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-15 DOI: 10.1016/j.cemconcomp.2025.106041

Feng Qu , Yuhao He , Congtao Sun , Lin Chen , Gang Peng , Gongxun Wang , Hailong Hou

{"title":"Influence of surface carbonation on the electrochemical chloride extraction of recycled aggregate concrete and sensitivity analysis","authors":"Feng Qu , Yuhao He , Congtao Sun , Lin Chen , Gang Peng , Gongxun Wang , Hailong Hou","doi":"10.1016/j.cemconcomp.2025.106041","DOIUrl":"10.1016/j.cemconcomp.2025.106041","url":null,"abstract":"<div><div>At present, applying ECE technology to existing concrete structures to enhance durability and service life is feasible. However, the combined effects of chloride salts and carbonation in marine environments introduce complex influence mechanisms on concrete structures treated with ECE, especially for reinforced concrete projects incorporating RCA. This paper studies the effect of different factors on the ECE of carbonated RAC. The effects include RCA quality and replacement rate, FA admixture, electrochemical parameters, etc. The results indicate that optimal dechlorination efficiency is observed at FA content of 10 %. Overall, increased replacement of RCA improves the dechlorination efficiency with a 26.19 % increase recorded at 100 % replacement ratio compared to NAC. After carbonation, the decomposition of hydration products such as C-S-H reduced the mechanical properties of concrete, but the extended carbonation duration enhanced the ECE effectiveness. With the extension of carbonation time to 28d, the dechlorination efficiency increases by 14.27 %. Longer times and higher energizing currents can enhance for ECE. Dechlorination efficiency of carbonated RAC increased by 42.8 % after 28d of chloride extraction, compared to 7d.Sensitivity analysis highlighted that the electrochemical parameters had the most significant effect on ECE effectiveness. The sensitivity of current density to dechlorination efficiency and the sensitivity of chloride extraction time to the [Cl<sup>−</sup>]/[OH<sup>−</sup>] are 0.241 and 5.418, respectively. This will contribute to improving the durability of RAC structures in marine environments and advancing low-carbon engineering.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106041"},"PeriodicalIF":10.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631263","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

Water quenching and grinding of ladle furnace slag for use as supplementary cementitious material in cemented mine backfills

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-14 DOI: 10.1016/j.cemconcomp.2025.106048

Noureddine Ouffa , Tikou Belem , Romain Trauchessec , Cécile Diliberto , Pascal Lemoine , Youssef Benarchid , Mostafa Benzaazoua

{"title":"Water quenching and grinding of ladle furnace slag for use as supplementary cementitious material in cemented mine backfills","authors":"Noureddine Ouffa , Tikou Belem , Romain Trauchessec , Cécile Diliberto , Pascal Lemoine , Youssef Benarchid , Mostafa Benzaazoua","doi":"10.1016/j.cemconcomp.2025.106048","DOIUrl":"10.1016/j.cemconcomp.2025.106048","url":null,"abstract":"<div><div>As a secondary support material, cemented paste backfill (CPB) is widely used in underground mining operations. CPB is a mixture of mine tailings, water, and a small amount of a binder agent. In the Abitibi region of Canada, the standard binder typically contains 20 % general-use Portland cement (GU) and 80 % ground granulated blast-furnace slag (GGBFS). This binder combination reliably ensures that CPB meets the required unconfined compressive strength (UCS) targets. However, the rising cost of binders, the environmental impact of GU, and the limited availability of GGBFS have created a need for alternative materials. Efforts are underway to replace GU and identify substitutes for GGBFS in CPB formulations. This study explores the potential of ground granulated ladle furnace slag (GGLFS) as a partial replacement for both GU and GGBFS in CPB. Raw ladle furnace slag (LFS) was first quenched under pressurized water and ground to produce GGLFS. The GGLFS was then incorporated into various CPB formulations and pure cement pastes for testing. The results demonstrate that GGLFS enhances the reactivity of GU/GGBFS blends in CPB, achieving satisfactory UCS after 7 and 28 days of curing. Additionally, GGLFS accelerates the initial reaction and modifies the hydration products in GU/GGBFS formulations. These findings highlight the promising potential of GGLFS as a supplementary cementitious material in CPB applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106048"},"PeriodicalIF":10.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618621","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 composite activator on hydration kinetics and micromechanical properties of alkali-activated slag

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-13 DOI: 10.1016/j.cemconcomp.2025.106047

Yong Zheng , Hui Zhong , Keke Sun , Bo Shen , Kai Cui , Yingliang Zhao , Guangqi Xiong , Qinglong Qin

{"title":"Effect of composite activator on hydration kinetics and micromechanical properties of alkali-activated slag","authors":"Yong Zheng , Hui Zhong , Keke Sun , Bo Shen , Kai Cui , Yingliang Zhao , Guangqi Xiong , Qinglong Qin","doi":"10.1016/j.cemconcomp.2025.106047","DOIUrl":"10.1016/j.cemconcomp.2025.106047","url":null,"abstract":"<div><div>Alkali-activated slag (AAS) materials prepared from traditional activators such as NaOH exhibit low sustainability and workability while replacing NaOH with some weakly alkaline solutions (e.g., Na<sub>2</sub>SO<sub>4</sub>) is promising to mitigate the above issues. This paper performs a comprehensive study on the effect of different composite activator combinations i.e., NaOH + Phosphogypsum (PG), NaOH + Na<sub>2</sub>SO<sub>4</sub> and Na<sub>2</sub>SO<sub>4</sub> + Ca(OH)<sub>2,</sub> on the reaction kinetics, phase assemblage, micromechanical properties and microstructure of AAS. The reaction products and microstructure of AAS were characterised by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermogravimetric (TG), backscattered electron microscopy (BSEM) and mercury intrusion porosimetry (MIP) techniques. Inductively coupled plasma optical emission spectrometry (ICP-OES) test was used to investigate the pore solution chemistry of AAS. The nanoindentation test was carried out to evaluate the micromechanical properties of AAS. Results indicate that the use of composite activators can significantly reduce the hydration heat of AAS compared to systems activated by a single activator type. Combining PG and NaOH as the composite activator results in more AFt phases, refining the pore structure of AAS and reducing the average critical pore size. Besides, the elastic modulus of the individual solid phases in AAS prepared by this combination significantly outperformed other AAS mixes.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106047"},"PeriodicalIF":10.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618764","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

An innovative ternary carbon-fixing cementitious system of cement-fly ash-carbonated steel slag

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-13 DOI: 10.1016/j.cemconcomp.2025.106042

Yingliang Zhao , Yong Zheng , Kai Cui , Peiliang Shen , Chi Sun Poon , Juhyuk Moon , Guangmin Peng , Ruilai Guo , Daohui Xia

{"title":"An innovative ternary carbon-fixing cementitious system of cement-fly ash-carbonated steel slag","authors":"Yingliang Zhao , Yong Zheng , Kai Cui , Peiliang Shen , Chi Sun Poon , Juhyuk Moon , Guangmin Peng , Ruilai Guo , Daohui Xia","doi":"10.1016/j.cemconcomp.2025.106042","DOIUrl":"10.1016/j.cemconcomp.2025.106042","url":null,"abstract":"<div><div>The present work introduced an innovative cementitious system named CFCS, combining cement, fly ash (FA), and carbonated steel slag (CS), which exhibited both high early and later-age compressive strength along with significantly lower carbon emissions. This was achieved by producing highly reactive silica gels and carbon-fixing calcium carbonates (<em>Cc</em>) from steel slag (SS) via CO<sub>2</sub>-assisted wet grinding. The results indicate that CFCS shows remarkable improvements in compressive strength, about 26 % and 34 % higher compared to the system of cement-FA-limestone (CFL) at 1 d and 28 d, respectively. The superior early performance of CFCS is attributed to the high pozzolanic reactivity of silica gels in CS, which facilitates the formation of additional calcium-silicate-hydrate (C-S-H) gels. Additionally, reactive <em>Cc</em> readily reacted with aluminates to form monocarbonate (Mc). These gels act as nucleation sites, promoting a higher cement hydration degree and contributing to early strength development. The accelerated cement hydration induced by CS creates a favorable environment for the higher reaction degree of fly ash (FA), resulting in sustained enhancement of compressive strength at later stages. Moreover, the carbon reduction of CFCS can reach about 64 % compared to ordinary Portland cement, representing an ultra-low carbon cementitous system.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106042"},"PeriodicalIF":10.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608300","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

Regulating the workability of NaOH-activated blast furnace slag pastes by considering the mutual inhibition between calcium-sodium aluminosilicate hydrate and hydrotalcite during precipitation

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-13 DOI: 10.1016/j.cemconcomp.2025.106022

Ruiquan Jia , Yanxin Chen , Shaowu Jiu , Shiyu Zhuang

{"title":"Regulating the workability of NaOH-activated blast furnace slag pastes by considering the mutual inhibition between calcium-sodium aluminosilicate hydrate and hydrotalcite during precipitation","authors":"Ruiquan Jia , Yanxin Chen , Shaowu Jiu , Shiyu Zhuang","doi":"10.1016/j.cemconcomp.2025.106022","DOIUrl":"10.1016/j.cemconcomp.2025.106022","url":null,"abstract":"<div><div>Regulating the workability of NaOH-activated blast furnace slag (NAS) pastes is essential for their effective application. Based on the mutual inhibition between calcium-sodium aluminosilicate hydrate (C-N-A-S-H) and hydrotalcite (LDH) during precipitation (MICL), a novel strategy for regulating paste workability was developed. The workability losses, including the slump loss and the setting time, occurred through hydrate formation and was controlled by the MICL mechanism. The inhibition of the LDH formation by C-N-A-S-H caused the formation of Ca-containing LDH by replacing Mg<sup>2+</sup> with Ca<sup>2+</sup>. With moderate NaAlO<sub>2</sub> addition, C-N-A-S-H and Ca-containing LDH slowly formed because the difference in the degree of mutual inhibition between C-N-A-S-H and LDH during precipitation (DMICL) was minimized. Therefore, workability losses occurred slowly. However, at relatively high (low) NaAlO<sub>2</sub> addition amounts, the DMICL was large, and Ca-containing LDH (C-N-A-S-H) quickly formed; thus, workability losses occurred rapidly. A moderate addition of NaAlO<sub>2</sub> with 1 % Al<sub>2</sub>O<sub>3</sub> decelerated the workability losses and increased the compressive strength.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106022"},"PeriodicalIF":10.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618622","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