Construction and Building Materials最新文献

{"title":"Research on the durability of composite epoxy resin modified repair mortars based on water-oil gradient phase change: From macroscopic to nanoscopic scales","authors":"Heping Zheng ,&nbsp;Yuying Duan ,&nbsp;Bo Pang ,&nbsp;Meng Wang ,&nbsp;Pan Wang ,&nbsp;Dongshuai Hou","doi":"10.1016/j.conbuildmat.2024.139325","DOIUrl":"10.1016/j.conbuildmat.2024.139325","url":null,"abstract":"<div><div>With the rapid pace of urbanization, global demand for concrete is increasing, shifting focus from construction to repair and maintenance. Traditional cement-based repair materials generally suffer from brittleness and poor durability, failing to meet the growing demand for durable repair solutions. We developed a water-oil gradient composite epoxy resin (CEP) modified cement-based repair mortar (MCEP) using self-synthesized water-based epoxy resin (WEP) and oil-based epoxy resin (EP). Durability tests showed that CEP-modified cement mortar exhibited improved resistance to solution penetration, shrinkage, acid corrosion, and freeze-thaw cycles, with increased CEP content positively affecting mortar durability. Notably, the addition of CEP not only enhanced the interface bonding strength between MCEP and old concrete but also maintained good bonding stability under moisture erosion. X-CT and SEM microstructural tests revealed that CEP is evenly distributed in the cement paste, forming a cement-polymer interpenetrating network structure, which improves crack resistance and reduces solution penetration in MCEP. Molecular dynamics simulations explored the adsorption of CEP on calcium aluminate hydrate (AFt), a key cement hydration product, and the moisture transport mechanisms in AFt and CEP-modified AFt nanopores. Results indicated that CEP molecules adsorb onto AFt via ionic and hydrogen bonds, demonstrating good stability. During moisture penetration, CEP reduced water transport efficiency in the nanopores. CEP modification improved the crack resistance and durability of cement repair mortars, providing valuable insights into molecular-scale enhancements in water permeability resistance. This study aims to contribute to the design and practical application of water-oil gradient epoxy resins and other polymer-modified cement-based repair materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139325"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745365","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":"Characterization of aircraft landing impact loads: Effects on vertical tire-pavement contact characteristics and pavement performance","authors":"Tongxu Wang ,&nbsp;Zejiao Dong ,&nbsp;Cheng Cao ,&nbsp;Jie Zhou ,&nbsp;Yuhang Meng ,&nbsp;Weiwen Quan","doi":"10.1016/j.conbuildmat.2024.139365","DOIUrl":"10.1016/j.conbuildmat.2024.139365","url":null,"abstract":"<div><div>The comprehensive understanding of the mechanistic behavior of airport pavements under aircraft landing loads is essential for ensuring safety and durability. Addressing the limited understanding on the interaction between aircraft landing gear and airport pavement during landing, this study proposed a measurement method for the vertical dynamic contact characteristics of tire-pavement interface and internal dynamic responses based on a laboratory dynamic test device. This involved the experimental design and testing method for the dynamic characteristics of landing gear landing loads, utilizing the Tekscan pressure measurement system to evaluate the vertical dynamic contact characteristics between the aircraft tires and pavement during landing. Through comparative analysis with the static results, the study revealed the importance of landing load measurements for mechanical response analysis and durability design of airport pavements. Additionally, the study investigated the dynamic response of airport pavements under different simulated aircraft landing speeds and weights, and further quantified the impact effects of aircraft landing loads on airport pavements. The results show that the vertical tire-pavement contact characteristics under landing impact are significantly different from those under static conditions, and need to be considered. The proposed quantitative equations with acceptable good fitting effect provided more accurate and efficient vertical load inputs for numerical simulation and durability design of airport pavements, which laid the foundation for understanding the failure mechanisms of airport pavement and enhancing the safety of aircraft and airport operation.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139365"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745404","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":"Fiber distribution in UHPC under different influencing factors evaluated with a novel method based on deep learning","authors":"Chen Shen ,&nbsp;Desha Tang ,&nbsp;Peiyi Wang ,&nbsp;Zhaoqiu Lyu ,&nbsp;Mingtao Zhang ,&nbsp;Baoming Liu ,&nbsp;Changhui Yang ,&nbsp;Linwen Yu","doi":"10.1016/j.conbuildmat.2024.139350","DOIUrl":"10.1016/j.conbuildmat.2024.139350","url":null,"abstract":"<div><div>The dispersion of fibers in UHPC significantly affects its mechanical properties. Currently, conventional image analysis methods are employed to evaluate fiber dispersion. However, due to the settling of steel fibers in UHPC and the subjectivity of image processing, the evaluation of fiber dispersion is neither sufficiently thorough nor accurate. In this study, removal method was used to optimize a deep learning-based U-net model for fiber identification. And sinkage coefficient was proposed as a complementary index for evaluating fiber dispersion. Subsequently, the accuracy of both the identification technique and evaluation method was separately validated. Then, the image processing techniques and evaluation method proposed in this study are applied to investigate the impact of various factors on fiber distribution in UHPC. The results indicate that the optimized deep learning-based network accomplished batch image semantic segmentation and image denoising. This approach mitigated the subjectivity during threshold selection and minimized the influence of low-quality images on fiber identification. The proposed sinkage coefficient can reflect the impact of fiber sinking on its performance. This coefficient associate with distribution and orientation coefficients can evaluate fiber dispersion comprehensively. Experimental investigations revealed that during vibration, fibers in UHPC exhibit sinking or floating phenomena. The consistency of the slurry emerges as a pivotal factor affecting fiber dispersion. Lower consistency results in pronounced fiber sinking, whereas higher consistency induce fiber floating. The incorporation of coarse aggregate facilitates the formation of a network structure with steel fibers, thereby ameliorating fiber sinking or floating tendencies, further affecting the fiber dispersion. Additionally, the increase in vibration time is also detrimental to the uniform dispersion of fibers.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139350"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745395","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":"Mortars produced with recycled aggregates from construction and demolition waste – Analysis and construction site application","authors":"Ana Antunes ,&nbsp;Hugo Costa ,&nbsp;Ricardo do Carmo ,&nbsp;Eduardo Júlio","doi":"10.1016/j.conbuildmat.2024.139395","DOIUrl":"10.1016/j.conbuildmat.2024.139395","url":null,"abstract":"<div><div>The valorisation of construction and demolition waste (CDW) as secondary raw material is an important step towards enhancing sustainability in the construction sector, combining environmental benefits with circular economy and sustainable management. The aim of this work is to analyse several mortars produced with different percentages of replacement of natural aggregates (NA) by recycled aggregates (RA) and propose a mix design methodology. First, an extensive literature review was performed and several studies conducted in recent years have been compiled, focusing on RA produced from CDW and incorporated as recycled fine aggregates in mortar matrices. Several properties have been analysed, such as: compressive, flexural and bond strengths, Young’s modulus, capillarity, and shrinkage. Results are discussed, in order to characterize: (i) the binder paste, considering the combination of binders and the respective water-binder and binder-aggregates ratios; and (ii) the different RA and respective proportions (through replacement ratio), quantifying the respective influences on mechanical and durability properties. Subsequently, a methodology is proposed that integrates the aforementioned parameters, thereby enabling the design of mortars with different binders, RA and proportions, tailored to the specific requirements of each application. It has been concluded that, depending on the binder performance (mainly resultant of binder type, combined with its proportion, and the water-binder ratio), RA can have variable influence on the mortar properties. Furthermore, by dividing the mortars under study into groups defined by Feret coefficient intervals according to the binder used and associating the RA with correction coefficients that do not exceed 0.15 per percentage of incorporated RA, it is possible to design the mortar mix according to the desired mechanical properties.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139395"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745469","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":"Multi-scale characterization of lightweight aggregate and superabsorbent polymers influence on autogenous shrinkage and microstructure of ultra-high performance concrete","authors":"Jingjing Lyu ,&nbsp;Shuo Feng ,&nbsp;Qingsong Zhang","doi":"10.1016/j.conbuildmat.2024.139408","DOIUrl":"10.1016/j.conbuildmat.2024.139408","url":null,"abstract":"<div><div>This study investigates the effects of internal curing agents on the autogenous shrinkage, hydration, and microstructure of ultra-high-performance concrete (UHPC). Lightweight aggregate (LWA) and superabsorbent polymers (SAP) were examined across various dosages as representative internal curing agents. Measurements were taken for the mechanical properties, autogenous shrinkage, and internal relative humidity of the UHPC. The mechanisms of internal curing were analyzed using thermogravimetry, pore structure, and microstructural evaluations. Additionally, porosity and microhardness in the matrix around the fibers and internal curing agents were tested to quantitatively assess their impact on the properties of the UHPC matrix. Results indicate that high dosages of LWA or SAP negatively affect the compressive strength of UHPC. A dosage of 15 % LWA increased flexural strength by 11 %, whereas SAP showed no significant improvement in flexural strength. LWA effectively reduced autogenous shrinkage by 49.4 %-88.8 %, while a SAP dosage of 0.3 % reduced autogenous shrinkage by 82 %. Both LWA and SAP increased porosity by 33.9 %-55.9 %. SAP released water within the matrix, forming voids filled with calcium hydroxide. The interface between LWA and the matrix was dense, with porosity near the LWA and SAP interfaces being 23.5 %-53.9 % and 26.0 %-38.2 % lower, respectively, compared to other areas. The microhardness in the LWA and SAP interface regions was 20 % and 16.2 % higher than in different places. The LWA pre-saturated method can effectively reduce autogenous shrinkage, and 15 % LWA has no adverse effect on mechanical strength.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139408"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745407","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":"Asphalt-aggregates interface interaction: Correlating oxide composition and morphology with adhesion","authors":"Hai Wang ,&nbsp;Geng Chen ,&nbsp;Haoyi Kang ,&nbsp;Jiupeng Zhang ,&nbsp;Li Rui ,&nbsp;Lei Lyu ,&nbsp;Jianzhong Pei","doi":"10.1016/j.conbuildmat.2024.139317","DOIUrl":"10.1016/j.conbuildmat.2024.139317","url":null,"abstract":"<div><div>The adhesion between asphalt and aggregates is a complex physicochemical interfacial interaction that plays a critical role in determining the durability of asphalt pavement. This paper aims to investigate the determination mechanism of oxide composition and morphology of aggregates to their interfacial interaction and adhesion with asphalt, thereby optimizing the adhesion evaluation indicators of aggregates. Herein, the adhesion and interaction properties of aggregates were evaluated by photoelectric colorimetric, water boiling methods, and dynamic shear rheometer. The morphology and chemical compositions of 11 aggregates were characterized using X-ray diffraction, X-ray fluorescence, and scanning electron microscopy, thereby classified into 3 categories based on their oxide composition. The results indicate that the chemical composition of the aggregates is a crucial factor influencing adhesion rates, while micro-roughness impacts adhesion rates to varying degrees across different aggregate groups. Oxide composition was found to be a reliable predictor of adhesion properties, and incorporating surface roughness indicators improved the accuracy of adhesion rate prediction models. Both rheological indicators proved effective in characterizing the adhesion properties of aggregates, though they exhibited varying sensitivities depending on the aggregates categories.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139317"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745483","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":"Experimental research on fatigue behavior of concrete under acid rain corrosive environment","authors":"Kaicheng Xu ,&nbsp;Hongrui Huang ,&nbsp;Hanqi Xu ,&nbsp;Zijian Lu ,&nbsp;Weilin Yang ,&nbsp;Liqing Zhang","doi":"10.1016/j.conbuildmat.2024.139376","DOIUrl":"10.1016/j.conbuildmat.2024.139376","url":null,"abstract":"<div><div>Concrete infrastructures such as high-speed railway bridges, road pavements, and airport runways in acid rain areas are severely affected by fatigue loading and environmental corrosion. To investigate the impact of acid rain corrosion on the fatigue resistance of concrete, 12 groups of concrete specimens were exposed to acid rain spray tests and then subjected to bending fatigue testing. These tests comparatively examined the impact of different stress levels and corrosion ages on the concrete's fatigue life, strain, and damage pattern. Additionally, the fatigue life reliability of the concrete was analyzed using the Weibull distribution theory and equations were developed to predict the fatigue life of the concrete under different probabilities of failure. The results indicate that both stress level and acid rain corrosion age significantly affect the ultimate strain and fatigue life of concrete. High stress levels combined with prolonged acid rain exposure severely degrade the fatigue performance of the concrete. The fatigue life of the concrete follows a Weibull distribution, and the P-S-N curves and fatigue life equations developed based on data from various failure probabilities show a high linear association with values larger than 0.9. These findings can serve as a reference for predicting the fatigue life of concrete in areas affected by acid rain.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139376"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745368","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":"Feasibility of coal bottom ash as fine aggregate in strain-hardening cementitious composites: A study on strength, durability, and sustainability","authors":"Isyaka Abdulkadir ,&nbsp;Lee Woen Ean ,&nbsp;Leong Sing Wong ,&nbsp;G. Murali ,&nbsp;Bashar S. Mohammed ,&nbsp;Nur Aina Mumtazah Binti Mohamad Amin ,&nbsp;Raja Amir Haziq Bin Raja Jaafar","doi":"10.1016/j.conbuildmat.2024.139379","DOIUrl":"10.1016/j.conbuildmat.2024.139379","url":null,"abstract":"<div><div>The search for cost-effective and sustainable materials for strain-hardening cementitious composites (SHCC) has led researchers to explore alternatives to silica sand, a critical yet costly and environmentally unfavorable material. Although river sand seems like a cheaper and viable alternative, its extraction is linked to severe environmental degradation. This study aims to investigate the potential of coal bottom ash (CBA) as a replacement for silica sand in SHCC, targeting to meet the minimum requirements for structural applications. The novelty of this research lies in its comprehensive exploration of CBA as a partial to full replacement for silica sand (at 0 %, 25 %, 50 %, 75 %, and 100 %), extending beyond the replacement limit investigated in previous studies on SHCC, and provides an extensive evaluation of the composite’s fresh, mechanical, durability, and microstructural properties. Additionally, it includes a thorough assessment of the leaching potential, CO₂ emissions, energy consumption, and cost implications of the CBA-SHCC, which have not been fully explored in earlier CBA-SHCC research. The findings indicate that the reduction in mechanical strength was minimal (0.5 %-10 %) across all CBA replacement levels. Notably, all mixes demonstrated typical strain-hardening behavior, sustaining higher flexural loads beyond the first crack, with increased deflection capacity observed at higher CBA contents, peaking at 50 % replacement. Durability metrics, including water absorption and HCl acid attack resistance, exhibited a downward trend with higher CBA content but remained within acceptable limits up to 75 % replacement. Toxicity characteristic leaching procedure results confirmed the non-leachability of toxic elements in both the CBA and CBA-SHCC mixes. Economically and environmentally, CBA proved advantageous, resulting in 1.5–5 % lower CO₂ emissions, 0.4–1.5 % lower energy consumption, and 18–84 % cost savings at 25–100 % CBA replacement. Additionally, a multicriteria analysis using the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was employed, which identified 25 % as the optimal CBA content that balances fresh properties, mechanical strength, durability, environmental sustainability, and cost efficiency. The study is significant because it demonstrated that CBA can be used as a sustainable and cost-effective alternative to silica sand in SHCC, with lower environmental impact while maintaining structural integrity.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139379"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745405","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":"Punching shear performance of reinforced flat slabs considering in-plane restraints under and after a fire","authors":"Li Bing ,&nbsp;Yang Zhou-lin ,&nbsp;Zhang Zong-fu ,&nbsp;Li Zheng-shang ,&nbsp;Tang Ai-ping ,&nbsp;Zhang Yang","doi":"10.1016/j.conbuildmat.2024.139311","DOIUrl":"10.1016/j.conbuildmat.2024.139311","url":null,"abstract":"<div><div>Two full-scale test specimens, a reinforced concrete reference slab (denoted as S1) and a polypropylene fibre (PPF) concrete slab (S2), with a PPF length of 3 mm and PPF dosage of 1.0 kg/m³, were designed to investigate the effects of the in-plane restraints and PPF admixture on the punching shear response of flat slabs under and after a fire. The results indicated that both S1 and S2 showed a clear trend toward punching shear failure at approximately 210 min after ignition, but S2 had smaller crack widths and a greater limit displacement owing to the PPF admixture. Because of the restrained thermal expansion, many radial cracks first appeared around the punching shear cones on the top surfaces of S1 and S2 and then gradually extended across nearly the entire top surfaces of both test slabs, including their four corners. Meanwhile, both test slabs experienced cracks, which expanded and then retracted under a fire owing to in-plane restraints. In the residual load-carrying capacity tests, both S1 and S2 experienced larger ultimate destructive loads than the unrestrained slabs; thus, the in-plane restraints significantly improved their residual bearing capacities. In addition, S2 experienced a lower residual load and larger plastic deformation owing to the PPF admixture, which exhibited certain ductile failure characteristics.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139311"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757739","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":"Investigation the engineering properties and environmental impact of electrolytic manganese residue-based grouting materials for karst application","authors":"Conggan Xu ,&nbsp;Xuewen Lei ,&nbsp;Lijun Han ,&nbsp;Lei Lang ,&nbsp;Zisong Chen ,&nbsp;Saiou Fu ,&nbsp;Qianshen Ding ,&nbsp;Xuehao Liu ,&nbsp;Ping Wang ,&nbsp;Jiangshan Li","doi":"10.1016/j.conbuildmat.2024.139344","DOIUrl":"10.1016/j.conbuildmat.2024.139344","url":null,"abstract":"<div><div>The leakage channels, like karst caves and pipelines, prevalent in karst landscape regions promote the migration of pollutants from the landfill containing electrolytic manganese residue (EMR) to the surrounding environment, which poses a significant threat to the adjacent environmental safety. Grouting technology is a crucial approach for sealing leakage channels in landfill sites, preventing pollution caused by stockpiled EMR. This work aims to develop an electrolytic manganese residue composite grouting material (ECG), composed of EMR, sulphoaluminate cement, coal fly ash, ground granulated blast furnace slag, and bentonite, that is suitable for sealing leakages and preventing pollution in landfill sites located in karst regions. The effects of the water-cement (w/c) ratio of 0.8–1.1 and the EMR dosage of 10 %-50 % on the flowability, setting time, strength, permeability and leachability of ECG were systematically investigated. The results indicated that the addition of EMR increased the setting time and enlarged the time interval between initial and final setting, exhibiting the better workability. The unconfined compressive strength of ECG could surpass 7.0 MPa in 28 days, and the hydraulic conductivity were lower than 1×10⁻⁷ cm/s, which favored the landfill leakage remediation and pollution control. The primary hydration products of ECG include ettringite (AFt), aluminum hydroxide (AH₃) gel, calcium silicate hydrate (C-S-H), and calcium alumino-silicate hydrate (C-A-S-H), contributing to the formation of network compact structure. Mn²⁺ present in EMR can be stabilized within ECG in the form of Jouravskite (Ca₃Mn(SO₄)(CO₃)OH₆·12 H₂O). The leaching concentration of toxic elements from ECG was lower than threshold values of Chinese standard GB 3838–2002. This innovative grouting material exhibits excellent workability and high performance, rendering it an optimal choice for leakage containment applications in karstic landfill environments.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139344"},"PeriodicalIF":7.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745397","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}