Journal of Materials in Civil Engineering最新文献

{"title":"Effect of Cement Type on Compacted Iron Ore Tailings-Binder Response Blends: Comparative Study","authors":"Nilo César Consoli, Andres Lotero, Hugo Carlos Scheuermann Filho, Aghileh Khajeh, Cocou Auxence Pierre Daassi-Gli, Jordanna Chamon Vogt, João Paulo de Sousa Silva","doi":"10.1061/jmcee7.mteng-17486","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-17486","url":null,"abstract":"Lately, dry stacking of filtered tailings has emerged as a safer alternative to traditional slurry disposal in ponds as it comprehends the compaction of the unsaturated cake to form piles. A cementing agent can be added to the mixture to improve the mechanical properties of the compacted tailings; however, it is essential to understand its response under different conditions. The present study examines the mechanical behavior of compacted iron ore tailings (IOT)-binder blends for dry stacking purposes, highlighting the effect of the cement type on the behavior of the tailings: two commercially available types of binders, portland pozzolan cement (PPC) and high early-strength portland cement type III (PC III); and one green alkali-activated cement (AAC). A full factorial design approach was used to study the influence of the following parameters on the strength and stiffness of the studied mixtures: dry unit weight (γd), cement content (C), type of cement (TC), and curing period (CP). To do so, a set of unconfined compression, ultrasonic pulse velocity, and consolidated drained triaxial tests were carried out. To compare the microstructural and compositional characteristics of the three different cement types, secondary scanning electron microscopy (SSEM) and backscattered scanning electron microscopy (BSEM)/energy dispersive spectrometry (EDS) analyses were performed. The stiffness and strength results have been successfully correlated to the porosity/cement index (η/Civ) and the statistical analysis has unveiled the great effects attributed to the cement content, type, and CP. Additionally, microstructural and macrostructural observations revealed that after seven days of curing, the IOT mixtures stabilized with PC III exhibited more robust microstructures and superior mechanical performance: around five times greater strength and stiffness than AAC-containing samples and two times higher considering the PPC-containing specimens. With extended CPs (90 days), the performances of PC III and PPC samples are equivalent, whereas the strength is around three times greater than that of the AAC samples. That is, there was a notable enhancement in the cementitious matrix for IOTs stabilized with PPC and AAC for a more extended CP.","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"36 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147901373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Performance of Polycarboxylate Ether Superplasticizers with Controlled Structure via RAFT Polymerization","authors":"Xiao Dong Chen, Xinde Tang, Cuizhen Zhang, Haichao Guo, Xuefan Li, Laixue Pang, Yong Yang, Fuying Dong","doi":"10.1061/jmcee7.mteng-17613","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-17613","url":null,"abstract":"Comblike polycarboxylate superplasticizers (PCs) have been widely used as construction and building materials by means of high fluidity and fine dispersibility via electrostatic repulsion and steric hindrance. The conventional PCs are usually synthesized by free radical polymerization, which limit to understand and even distort the structure-property relationship due to the random molecular structure and the broad polydispersity. In this work, polycarboxylate ether superplasticizers of acrylic acid (AA) and ethylene glycol monovinyl PEG (EPEG) with controlled structure were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. The resultant copolymers (denoted as EPCs) were characterized by FT-IR, 1H NMR and GPC spectroscopy. The effect of actual acid/ether (AA/EPEG) ratio on the adsorption capacity and dispersion ability of EPCs in cement paste were deeply investigated. These results demonstrate that the dispersibility of EPCs with controlled molecular weights and comparatively narrow polydispersity indexes (PDI=1.2–1.4) strongly depends on the acid/ether ratio. With an increase of the feed molar ratio of AA/EPEG from 4∶1 to 8∶1, the molecular weight and their distribution of EPCs increases accordingly. In addition, the adsorption capacity and dispersion property of EPCs to cement are densely related to the molecular structure and composition and superior to that of conventional PC analogues. A possible mechanism was proposed that EPCs can act uniformly on the surface of cement particles due to the well-defined molecular structure and well-distributed molecular weight, which is different from the conventional PCs, which will offer the fundamentals of design and synthesis for polycarboxylate superplasticizers with controlled structures.","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"36 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147905989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unified Characterization of Rubber Asphalt Mixture Strength under Different Stress Loading Paths","authors":"Chao Zhang, Huanan Yu, Xuan Zhu, D. Yao, Xinghai Peng, Xianpeng Fan","doi":"10.1061/jmcee7.mteng-16145","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16145","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"35 5","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139126875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physicochemical Rejuvenation of Aged Styrene-Butadiene-Styrene-Modified Bitumen through Joint Use of Polyurethane Prepolymer and Tall Oil for Maintaining High-Temperature Property","authors":"Xiong Xu, Yaming Chu, Shanshan Li, Zihui Liu, Xuyong Chen, Guoyang Lu, Fuliao Zou","doi":"10.1061/jmcee7.mteng-16861","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16861","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"36 4","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139128935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Study on High-Temperature Creep Behavior of Full-Locked and Galfan-Coated Steel Cables","authors":"Yong Du, Dongdong Zhu, Shaojun Zhu","doi":"10.1061/jmcee7.mteng-16144","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16144","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"27 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139129053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discussion of “Study on Asphalt-Cement Materials for Seismic Isolation Layer of Shield Tunnels”","authors":"Xi Jiang, Yumeng Zhang, Jiwang Jiang, Xuehui Zhang, Zhen Leng","doi":"10.1061/jmcee7.mteng-16219","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16219","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"38 25","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139129456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved Performance of Natural Rubber Latex–Modified Asphalt Concretes with Various Types of Aggregates","authors":"M. Hoy, Apichat Suddeepong, S. Horpibulsuk, Kongsak Akkharawongthattana, A. Arulrajah, Apinun Buritatum, J. Horpibulsuk, Ahmad Safuan A. Rashid","doi":"10.1061/jmcee7.mteng-16274","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16274","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"18 2","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139126230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Staged Damage Behavior and Acoustic Emission Characteristics of Rock-Like Materials under the Coupled Effects of Clay Mineral Content and Uniaxial Loading","authors":"Chao Xu, Lei Xue, Yuan Cui, Tong Jiang, Mengyang Zhai, F. Bu","doi":"10.1061/jmcee7.mteng-16159","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16159","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"51 44","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139125422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Dynamics Simulation and Durability Experiment on Functional GO-Modified Cementitious Composites","authors":"Xue Meng, Qichang Fan, Liyu Zhou, Zhanpeng Wang, Liang Fan, Tian-Rang Yang, Zihao Yu, Qingshuo Zeng, Dan Meng","doi":"10.1061/jmcee7.mteng-16422","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16422","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"28 2","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139125879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbonation-Induced Corrosion on Concrete with Waste Brick Powder and Hydrated Lime Additive","authors":"Mani Mohan, Birendra Kumar Singh","doi":"10.1061/jmcee7.mteng-16252","DOIUrl":"https://doi.org/10.1061/jmcee7.mteng-16252","url":null,"abstract":"","PeriodicalId":16330,"journal":{"name":"Journal of Materials in Civil Engineering","volume":"33 22","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139126605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}