Magazine of Concrete Research最新文献_第5页

The optimized performance of ultra-high performance silicomanganese slag concrete by water glass immersion 水玻璃浸渍法优化了超高性能硅锰渣混凝土的性能

4区工程技术

Magazine of Concrete Research Pub Date : 2023-10-05 DOI: 10.1680/jmacr.22.00353

Baifu Luo, Dong Wang, Mohamed Elchalakani

引用次数: 0

Impact of recycled concrete aggregates on the strength and durability properties of pervious concrete 再生混凝土骨料对透水混凝土强度和耐久性的影响

4区工程技术

Magazine of Concrete Research Pub Date : 2023-10-05 DOI: 10.1680/jmacr.23.00089

Mudasir Nazeer, Kanish Kapoor, S.P. Singh

{"title":"Impact of recycled concrete aggregates on the strength and durability properties of pervious concrete","authors":"Mudasir Nazeer, Kanish Kapoor, S.P. Singh","doi":"10.1680/jmacr.23.00089","DOIUrl":"https://doi.org/10.1680/jmacr.23.00089","url":null,"abstract":"The present investigation has been designed to assess the performance of pervious concrete prepared with Fly Ash (FA) and Recycled Concrete Aggregates (RCA) in place of Portland Cement (PC) and Natural Aggregates (NA). The percentage of NA replacement with RCA was in the proportion of 0%, 50%, and 100%, while the percentage of FA substitution was fixed at 10%. Various fresh (workability and consistency), mechanical (compressive strength, split tensile, and shear strength), durability (abrasion resistance, freeze thaw, flexure, and acid resistance), and microstructural (SEM and EDS) properties of pervious concrete have been evaluated at different curing periods. The findings reveal that the incorporation of RCA at different levels and partial substitution of FA proves to be desirable for the use of pervious concrete for structural and pavement construction purposes. Furthermore, incorporation of 10% FA in addition to higher levels of RCA proves significantly beneficial in refining the microstructural behaviour of pervious concrete. A homogenous micrograph with dense and layered C-S-H and C-H with was observed for mix made with 10% FA and 100% RCA.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135482183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Performance testing of roof beam–column connections for precast N-system 预制n型体系屋面梁柱连接性能试验

4区工程技术

Magazine of Concrete Research Pub Date : 2023-10-03 DOI: 10.1680/jmacr.23.00037

Labeat Misini, Jelena Ristic, Viktor Hristovski, Danilo Ristic

{"title":"Performance testing of roof beam–column connections for precast N-system","authors":"Labeat Misini, Jelena Ristic, Viktor Hristovski, Danilo Ristic","doi":"10.1680/jmacr.23.00037","DOIUrl":"https://doi.org/10.1680/jmacr.23.00037","url":null,"abstract":"The precast N-system based on embedded-pin connections is used widely for constructing large precast industrial halls in south-eastern Europe and further afield, including areas of high seismicity. To assess realistically the seismic performances, safety margins and limitations of the connections, experimental investigations are essential. Experimental results from laboratory tests on a large-scale prototype model of the original roof beam–column connection show its actual bearing capacity, damage propagation pattern and specific failure mode. The experimental study was then extended to a prototype model of an upgraded roof beam–column connection. For better safety, the connection was upgraded with improved concrete confinement and stronger steel connecting pins. The experimental results show clearly that the implemented method for upgrading the pin-based connection provided very limited upgrading effects. To obtain much better and more reliable safety upgrading, a new innovative and effective upgrading method had to be developed. The capability of the implemented refined nonlinear three-dimensional micro-modelling concept to simulate realistically the complex nonlinear response of the tested original and upgraded roof beam–column connections was demonstrated by an extensive analytical simulation study.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135743634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Erratum 勘误表

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-10-01 DOI: 10.1680/jmacr.2023.75.20.1080

引用次数: 0

Characterization and standardization of different-origin end-of-life building materials toward assessment of circularity performance 面向循环性能评估的不同来源的报废建筑材料的特性和标准化

4区工程技术

Magazine of Concrete Research Pub Date : 2023-09-28 DOI: 10.1680/jmacr.23.00011

Emircan Ozcelikci, Gurkan Yildirim, Hocine Siad, Mohamed Lachemi, Mustafa Sahmaran

{"title":"Characterization and standardization of different-origin end-of-life building materials toward assessment of circularity performance","authors":"Emircan Ozcelikci, Gurkan Yildirim, Hocine Siad, Mohamed Lachemi, Mustafa Sahmaran","doi":"10.1680/jmacr.23.00011","DOIUrl":"https://doi.org/10.1680/jmacr.23.00011","url":null,"abstract":"Construction and demolition waste (CDW) management and recycling practices are crucial for transitioning to a circular economy. The focus of this study was on the detailed characterisation of different CDWs (hollow brick (HB), red clay brick (RCB), roof tile (RT), concrete and glass) collected from seven different demolition sites in Turkey. The CDWs were characterised based on particle size distribution, chemical composition and crystalline nature. Pozzolanic activity was evaluated through compressive strength measurements of cement mortars made with 20% cement replacement by CDWs at 7, 28 and 90 days. The results showed that the clayey CDWs exhibited similar physical/chemical properties and crystalline structures. The compositions of the waste concretes varied significantly based on their original materials. All the CDWs satisfied the minimum strength activity index (SAI) for supplementary cementitious materials, with pozzolanic activity influenced by the fineness and silica + alumina contents. The average SAIs for the HB, RCB, RT, concrete and glass were, respectively, 84.5%, 86.3%, 83.4%, 80.7% and 75.8%. Clayey CDWs contributed to mechanical strength development, while the contribution of concretes was related to the hydration of unreacted cementitious particles. Glass exhibited the weakest pozzolanic activity due to its coarser particle size. Overall, the CDWs demonstrated suitable properties for use as supplementary cementitious materials in Portland cement based systems.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135343010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 high temperature on the compression and bending properties of AASCM 高温对AASCM压缩和弯曲性能的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-09-05 DOI: 10.1680/jmacr.23.00029

Xueyuan Lv, Hao Cheng, Pang Chen, Yonggan Li, Zhiyong Wang

{"title":"Influence of high temperature on the compression and bending properties of AASCM","authors":"Xueyuan Lv, Hao Cheng, Pang Chen, Yonggan Li, Zhiyong Wang","doi":"10.1680/jmacr.23.00029","DOIUrl":"https://doi.org/10.1680/jmacr.23.00029","url":null,"abstract":"Alkali-activated slag cementitious materials (AASCM) with manufactured sand can effectively utilise industrial waste slag and reduce river sand consumption. Steel fibres can effectively improve the mechanical properties of AASCM. Therefore, this study investigated the influence of steel fibre and aggregate type on the compression and bending properties of AASCM after high-temperature treatment. The results showed that the mass loss rate, compressive strength, and flexural strength loss rate of AASCM with manufactured sand were higher than those with natural river sand at different temperatures. Steel fibres can increase the mass loss rate of AASCM; however, the influence of the steel fibre content on the mass loss of AASCM was not apparent. When the temperature was lower than 600°C, the compressive and flexural strength of AASCM effectively was increased by steel fibre, while for temperatures higher than 800°C, the mechanical properties of AASCM did not improved owing to the oxidation failure of steel fibre. Microstructure analysis showed that the number of microcracks in the AASCM increased owing to the high silicon content of the manufactured sand, and the bond property between the steel fibres and cementitious materials decreased with an increase in temperature.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41413165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Alkali activation of fly ash in self-consolidating concrete at low molar concentration 低摩尔浓度自密实混凝土中粉煤灰的碱活化

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-09-05 DOI: 10.1680/jmacr.22.00342

Muthu Kumar Palanisamy, Arun Murugesan, Abdul Aleem Mohamed Ismail, Deepasree Srinivasan

{"title":"Alkali activation of fly ash in self-consolidating concrete at low molar concentration","authors":"Muthu Kumar Palanisamy, Arun Murugesan, Abdul Aleem Mohamed Ismail, Deepasree Srinivasan","doi":"10.1680/jmacr.22.00342","DOIUrl":"https://doi.org/10.1680/jmacr.22.00342","url":null,"abstract":"As a means of minimizing the negative effects on the environment, the use of industrial byproducts in the building industry is becoming more popular. In recent trends alkali activation of precursor's booms in the market since activation of precursors improves the binding strength and durability as well as reduce the carbon footprint from cementing industry. Although, one such risk factor in alkali activation is the molar concentration. Increase in molar concentration of sodium hydroxide/ sodium silicate, the release of volatile substance from those acids would be more harmful to the environment. In this concern, the present study works on activating the precursor at low molar concentration thereby equalizing the performance through dosage of super plasticizers. In this direction, fly-ash was activated at 5M (NaOH) and replaced to cement at varying percentage in the range of 0 to 30% by weight. The performance of SCC was evaluated through fresh & hardened characteristics, and microstructural analysis. Evaluating the blended mixtures of SCC, AFA at 5M (NaOH), 0.89% of super plasticizers and 15% of replacement sounds to be better performance than compared to control SCC. The outcome of the present study will provide platform in activating a precursor at low molar concentration through the influence of super plasticizers.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49203479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Application of electro-injection method in improving cement mortar durability 电喷射法在提高水泥砂浆耐久性中的应用

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-08-18 DOI: 10.1680/jmacr.22.00063

Hongyou Shan, Jinxia Xu, Yuanhai Jiang, Hongfei Liu, Gang Zheng, Guomin Cui

{"title":"Application of electro-injection method in improving cement mortar durability","authors":"Hongyou Shan, Jinxia Xu, Yuanhai Jiang, Hongfei Liu, Gang Zheng, Guomin Cui","doi":"10.1680/jmacr.22.00063","DOIUrl":"https://doi.org/10.1680/jmacr.22.00063","url":null,"abstract":"An electrochemical method for improving durability of cement mortar by injection of nanoparticle (Al2O3 coated SiO2) is presented. In this method, nanoparticles are injected into cement mortar pores under an external electrical field, refining pore structure of cement mortar. The efficiency of electro-injection nano-particle treatment with different applied electric fields was evaluated by monitoring the evolution of cement mortar resistivity. The improvement of cement mortar durability after electro-injection of nano-particle treatment was assessed by examining the resistance to water absorption, carbonation, sulfate resistance and chloride diffusion. The microstructure of cement mortar after the electro-injection treatment was analyzed using Scanning Electron Microscope (SEM), Mercury Intrusion Porosimetry (MIP), X-Ray Diffraction (XRD) and Differential Thermo-Gravimetric Analysis (DTG). The results show that improving cement mortar durability by the injection of nanoparticle under external electric field can be obtained. The efficiency of electro-injection nano-particle treatment increased with the increasing of applied electric field. The resistance to water absorption, carbonation, sulfate attack and chloride diffusion were significantly improved by using the electro-injection method. The improvement in cement mortar durability can be attributed to the filling effect of nanoparticles.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46578670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Prediction of fire spalling behaviour of fiber reinforced concrete 纤维混凝土火灾剥落行为的预测

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-08-15 DOI: 10.1680/jmacr.23.00060

Jingtai Jiang, Ming Wu, M. Ye

{"title":"Prediction of fire spalling behaviour of fiber reinforced concrete","authors":"Jingtai Jiang, Ming Wu, M. Ye","doi":"10.1680/jmacr.23.00060","DOIUrl":"https://doi.org/10.1680/jmacr.23.00060","url":null,"abstract":"Fire spalling prediction of fiber reinforced concrete containing polypropylene (PP) fiber and steel fiber at elevated temperature is a challenging problem. The conventional methods such as FEM and DEM are difficult to deal with the problem as a result of complicate coupling mechanism of polypropylene (PP) fiber and steel fiber in concrete. To this end, two artificial neural network (ANN) models, one (ANN1) is on the basis of concrete mix study and the other one (ANN2) is based on compressive strength study, are introduced in current study to assess the resistance of concrete to explosive spalling. A number of 321 and 318 test data gathered from literature are utilized to train the two proposed ANN models. Twenty-four concrete mixes (96 groups), i.e., seven plain concrete (PC) mixes, four high performance concrete (HPC) mixes reinforced with PP fiber, three ultra-high-performance concrete (UHPC) with reinforced PP fiber and ten ultra-high-performance concrete (UHPC) mixes reinforced with PP and steel hybrid fiber are designed and tested to validate the accuracy of the two models. It demonstrates that ANN1 and ANN2 can achieve a predictive accuracy of 89.6% and 84.4% for the explosive spalling respectively, which indicates the feasibility of proposed ANN models for predicting explosive spalling threat of the hybrid fiber reinforced concrete.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44160508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Comparison of fundamental properties and durability of mortar mixed with antibacterial functional materials 掺抗菌功能材料砂浆的基本性能和耐久性比较

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-08-15 DOI: 10.1680/jmacr.23.00001

Il-Sun Kim, So-Yeong Choi, E. Yang

引用次数: 1