Advances in Cement Research最新文献_第10页

Partial replacement of OPC with CSA cements – effects on hydration, fresh-, hardened-properties 用CSA水泥部分替代OPC -对水化、新鲜、硬化性能的影响

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-10-03 DOI: 10.1680/jadcr.22.00054

A. Kothari, Ilda Tole, H. Hedlund, Tommy Ellison, A. Ćwirzeń

{"title":"Partial replacement of OPC with CSA cements – effects on hydration, fresh-, hardened-properties","authors":"A. Kothari, Ilda Tole, H. Hedlund, Tommy Ellison, A. Ćwirzeń","doi":"10.1680/jadcr.22.00054","DOIUrl":"https://doi.org/10.1680/jadcr.22.00054","url":null,"abstract":"The effects of a partial replacement of Ordinary Portland cement (OPC) with three types of calcium sulfoaluminate (CSA) cements (40 wt% and 20 wt%) were investigated. The obtained results were generally in agreement with previously published data but with few interesting exceptions. Setting times were shortened due to the formation of ettringite. The maximum hydration temperature increased for concretes containing 40 wt% of CSA but decreased when 20 wt% replacement was used. The decrease was related to the deficiency of the available sulfates, which limited the formation of ettringite. The presence of extra anhydrite and calcium oxide was associated to the delayed establishment of the second temperature peak in contrast to OPC-based concretes. Their surplus delayed calcium aluminate and belite reactions, and triggered renewed formation of ettringite, C-S-H and portlandite. Effects of aluminum hydroxide were also indicated as possibly important, although not proved experimentally in this research. The slightly lower compressive strength measured for mixes containing 40 wt% of CSA were linked with more formed ettringite. The same factor was indicated as the key to the reduction of the total shrinkage in mixes containing 40 wt% of CSA and increased for the lower CSA replacement level. In that case, the insufficient amount of formed ettringite caused too small expansion, which could not efficiently mitigate or compensate the developed shrinkage.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45592811","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: 2

Comprehensive dielectric model of cement concrete including frequency and temperature 包括频率和温度的水泥混凝土综合介电模型

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-09-23 DOI: 10.1680/jadcr.21.00196

Meili Meng, Zhanglan Chen, F. Wang

{"title":"Comprehensive dielectric model of cement concrete including frequency and temperature","authors":"Meili Meng, Zhanglan Chen, F. Wang","doi":"10.1680/jadcr.21.00196","DOIUrl":"https://doi.org/10.1680/jadcr.21.00196","url":null,"abstract":"The dielectric properties of cement concrete are not only related to the dielectric properties and volume ratio of each component, but also related to frequency and temperature. In order to analyze these influencing factors, a dielectric constant test was done in the laboratory. Experimental results show that the dielectric constants decrease linearly with temperature increasing and decreases exponentially with the increase of frequency. Based on the experimental rules, a new dielectric model including frequency and temperature is established and verified by experiments. The verification results show that the calculation accuracy of the comprehensive dielectric model after considering the influence of frequency and temperature is improved by 25.5%, which meets the requirements of engineering detection accuracy. The model is applied to engineering practice, and the calculation methods of pavement structural layer thickness and moisture content are developed. The results show that the comprehensive dielectric model established in this paper has smaller error and higher accuracy. Using this dielectric model, the data conversion between different frequency and temperature can be achieved. The research results of this paper can provide reference and basis for the quality evaluation of concrete structures.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41431294","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

Sulfate resistance of ultra-high performance concrete with recycled fine aggregate 再生细骨料超高性能混凝土的抗硫酸盐性能

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-08-31 DOI: 10.1680/jadcr.21.00187

Bin-bin Zhang, Y. Ma, Guanji Lyu, Shikang Wu, Hui-Ning Jiang, Yantong Hu, Tao Ji

引用次数: 0

Analyzing of Nano-SiO2 Usage with Fly Ash for Grouts with Artificial Neural Network Models 应用人工神经网络模型分析粉煤灰在灌浆中的纳米sio2用量

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-08-11 DOI: 10.1680/jadcr.21.00180

F. Çelik, Oguzhan Yildiz, A. B. Çolak, Samet Mufit Bozkır

{"title":"Analyzing of Nano-SiO2 Usage with Fly Ash for Grouts with Artificial Neural Network Models","authors":"F. Çelik, Oguzhan Yildiz, A. B. Çolak, Samet Mufit Bozkır","doi":"10.1680/jadcr.21.00180","DOIUrl":"https://doi.org/10.1680/jadcr.21.00180","url":null,"abstract":"During grout penetrating to voids and cracks in soils and rock layers, pumping grouts easily and effectively is vital parameter for especially grouting works in geotechnical improvements. For this reason, improving the rheological parameters of cement-based grouts and increasing the fluidity are important for an effective grouting injection. In this study how nano silica (n-SiO2) together with fly ash will affect the rheological behavior of cement-based grouts has been experimentally investigated and analyzed with artificial neural network (ANN) models. The effects of nano silica (n-SiO2) additions at different contents by mass (%0.0, %0.3, %0.6, %0.9, %1.2 and %1.5) on plastic viscosity and yield stress values of cement-based grouts incorporated with fly ash as mineral additive at different constitutes (%0-for control purpose, %5, %10, %15, %20, %25 and %30) were investigated in this study. Moreover, using the obtained experimental data, a feed-forward (FF) back-propagation (BP) multi-layer perceptron (MLP) artificial neural network (ANN) has been developed to predict the plastic viscosity and yield stress of cement-based grouts with n-SiO2 nanoparticle additives. The developed ANN model can predict the plastic viscosity and yield stress values of cement-based grouts containing n-SiO2 nanoparticle doped fly ash with high accuracy.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44775507","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: 3

Features of Immittance Spectra as Performance Indicators for Cement-Based Concretes 作为水泥基混凝土性能指标的阻抗谱特征

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-08-11 DOI: 10.1680/jadcr.22.00023

W. McCarter, B. Suryanto, Hussameldin Mohamed Taha Abdalgadir, G. Starrs, Jaehwan Kim

{"title":"Features of Immittance Spectra as Performance Indicators for Cement-Based Concretes","authors":"W. McCarter, B. Suryanto, Hussameldin Mohamed Taha Abdalgadir, G. Starrs, Jaehwan Kim","doi":"10.1680/jadcr.22.00023","DOIUrl":"https://doi.org/10.1680/jadcr.22.00023","url":null,"abstract":"The design for durability and performance-based standards and specifications for reinforced concrete infrastructure, is limited by the lack of rapid, science-based test methods for characterizing the deterioration resistance of concrete. In this paper, this issue is addressed though the application of two-point electrical impedance measurements taken within the frequency range 100Hz-10MHz. Data are presented for a range of industry-standard cement-based concrete mixes with and without supplementary cementitious materials (SCM's). The Nyquist (-iZ’’(ω) vs Z’(ω) and Bode (Z*(ω) and θ vs frequency) formats clearly highlight the frequency dependence of the electrical response, however, when presented in the form of permittivity and conductivity, a region of dispersion was evident over the entire frequency range for all concretes. Features of this response, which could be gainfully exploited as durability indices for assessing the long-term performance of concrete, are identified and discussed. A range of formalisms is presented, and it is shown that within this frequency range the conductivity was found to obey Jonscher's universal power-law. Two novel durability parameters are presented based on features of Jonscher's model and, from a practical viewpoint, the power-law model can be evaluated using conductivity measurements obtained at three, easily measured, spot frequencies (viz. 10kHz, 1MHz and 10MHz).","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47095401","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

Shrinkage of High Strength Engineered Cementitious Composite with Zeolite Particles as Internal Curing Agent 以沸石颗粒为内固化剂的高强工程胶凝复合材料的收缩率

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-08-11 DOI: 10.1680/jadcr.19.00143

Qing Wang, Wenjie Huang, Jing Sun, Jun Zhang

引用次数: 1

Contribution of turbidimetry on the characterization of cement pastes bleeding 浊度法对水泥浆体出血表征的贡献

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-07-20 DOI: 10.1680/jadcr.22.00040

Y. El Bitouri, N. Azéma

引用次数: 2

Utilization of Low Reactivity Fly Ash for Fabricating Geopolymer Materials 利用低反应性粉煤灰制备地质聚合物材料

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-07-20 DOI: 10.1680/jadcr.21.00025

A. Poowancum, Prasert Aengchuan

{"title":"Utilization of Low Reactivity Fly Ash for Fabricating Geopolymer Materials","authors":"A. Poowancum, Prasert Aengchuan","doi":"10.1680/jadcr.21.00025","DOIUrl":"https://doi.org/10.1680/jadcr.21.00025","url":null,"abstract":"Low reactivity fly ash (LRFA) is obtained from a low temperature combustion furnace, is a low-pozzolanic activity ash, is a hazardous waste, and is undesirable for engineering applications. The aim of this work is to investigate the mixing procedure for fabricating a cement replacement material, i.e., geopolymer by using LRFA blended with the calcined kaolinite clay as a precursor. A mixture of sodium hydroxide and sodium silicate is used as an alkaline solution. The results show that to obtain sufficient strength for engineering applications, the sequence mixing (SM) procedure is required. Using the conventional mixing method, geopolymer has high porosity and low strength. Because the gas bubbles are generated from the reaction between alkaline solution and the impurity in LRFA during the hardening process. By using the SM method, the generated gas bubbles are released before the geopolymer is hardened. As a result, the porosity is reduced, and the strength is significantly increased. The 7-day strength of geopolymer fabricated by the SM method is higher than the minimum requirement of Portland cement. In addition, the SM procedure reduces the setting time of LRFA-geopolymer, which is an advantage for rapid repair applications.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44705981","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

The hydration, strength and deformation of Portland composite cements containing light-burnt dolomite and metakaolin 轻烧白云石和偏高岭土硅酸盐复合水泥的水化、强度和变形

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-07-20 DOI: 10.1680/jadcr.21.00141

Deng Chen, L. Mo, A. Wang, Kaiwei Liu, Shiping Zhang, Tao Yang

{"title":"The hydration, strength and deformation of Portland composite cements containing light-burnt dolomite and metakaolin","authors":"Deng Chen, L. Mo, A. Wang, Kaiwei Liu, Shiping Zhang, Tao Yang","doi":"10.1680/jadcr.21.00141","DOIUrl":"https://doi.org/10.1680/jadcr.21.00141","url":null,"abstract":"Light-burnt dolomite (LBD) as a compound MgO expansive agent can compensate effectively the shrinkage of concrete at early ages. However, in terms of strength, the replacement amount of Portland cement with LBD is limited due to the low reactivity of calcite in LBD. In this study, metakaolin used as a modified material was incorporated into the blended cements containing LBD to improve the reactivity of calcite in LBD. The results showed that the incorporation of LBD and metakaolin decreased the hydration heat and strengths of Portland cement at early ages, but the strength increased with increasing the mass ratio of metakaolin to LBD at later ages. Especially, the strengths of the blended cement containing 20% metakaolin and 20% LBD were even higher than those of Portland cement. This was mainly related to the formation of compact pore structure with decreased porosities due to the improvement of the reactivity of calcite in LBD and the pozzolanic reactivity of metakaolin. Additionally, in comparison to Portland cement, the incorporation of LBD and metakaolin could produce a certain expansion due to the high hydration reactivity of MgO in LBD, and mitigated the shrinkage.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47982605","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

Investigating the physical and chemical contribution of ground low-quality fly ash particles to cementitious composites 研磨低质量粉煤灰颗粒对水泥基复合材料的物理和化学贡献研究

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2022-07-08 DOI: 10.1680/jadcr.21.00173

Meenakshi Sharma, Rohit Bhushan, Satya Medapalli, Shashank Bishnoi

引用次数: 0