Advances in Cement Research最新文献_第6页

Acoustic behavior of Portland cement paste with additive of sodium gluconate during hydration 添加葡萄糖酸钠的硅酸盐水泥浆水化过程中的声学特性

4区工程技术

Advances in Cement Research Pub Date : 2023-10-04 DOI: 10.1680/jadcr.23.00122

Xu Dongyu, Chen Huaicheng, Hao Longlong, Zhao Hongyi, Guan Xuemao, Hu Yan, Sha Fei

{"title":"Acoustic behavior of Portland cement paste with additive of sodium gluconate during hydration","authors":"Xu Dongyu, Chen Huaicheng, Hao Longlong, Zhao Hongyi, Guan Xuemao, Hu Yan, Sha Fei","doi":"10.1680/jadcr.23.00122","DOIUrl":"https://doi.org/10.1680/jadcr.23.00122","url":null,"abstract":"The ultrasonic pitch-catch experiment was conducted to study the hydration behavior of Portland cement paste with additive of sodium gluconate (SG) by using the tailor-made piezoelectric transducer. The X-ray diffraction (XRD) analysis shows that the intensity of the diffraction peak of Ca(OH) 2 decreases with increasing the SG content, especially when the SG content is larger than 0.1wt.%. The compressive strength of the hardening cement paste when SG content is larger than 0.05wt.% decreases remarkably. The ultrasonic waveforms appear at hydration age of 2 h, and amplitudes of waveform of the cement pastes with SG contents of 0.15wt.% and 0.2wt.% are obviously larger than those with SG content of 0.05wt.% in the early hydration stage. The hydration process of cement paste in 300 h can be classified into three stages based on the head wave amplitude variation, that is, the fluctuation variation period, the rapid increasing period and smooth increasing period. The acoustic propagation time changes greatly with hydration before hydration age of 48 h, indicating that the hydration and hardening process of the cement paste is violent in 48 h. The proposed ultrasonic monitoring method opens a new perspective for hydration behavior study of the cement paste with additive of sodium gluconate.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135591202","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

Effect of Sisal fiber's treatment on hydration and thermophysical properties of cement biocomposite 剑麻纤维处理对水泥生物复合材料水化及热物理性能的影响

4区工程技术

Advances in Cement Research Pub Date : 2023-10-04 DOI: 10.1680/jadcr.21.00167

Bouchra Bahja, L.H. Omari, A. Tizliouine, A. Elouafi, H. Salhi, Mohammed Chafi

{"title":"Effect of Sisal fiber's treatment on hydration and thermophysical properties of cement biocomposite","authors":"Bouchra Bahja, L.H. Omari, A. Tizliouine, A. Elouafi, H. Salhi, Mohammed Chafi","doi":"10.1680/jadcr.21.00167","DOIUrl":"https://doi.org/10.1680/jadcr.21.00167","url":null,"abstract":"Cement-based biocomposites are a current area of construction research. Plant fibres retard the setting times of cement due to their hydrophilic nature and the thermal properties of raw cement mortar containing plant fibres can be problematic. This aim of this work was to study the effect of fibre treatment to reduce the hydrophilicity of natural fibres while enhancing the thermal properties of the cementitious matrix. The first part of this study focused on structural and morphological aspects. Scanning electron microscopy showed a tiny calcium layer around the sisal fibre treated with sodium hydroxide and paraffin oil on the adhesion surface. Fourier transform infrared spectroscopy revealed a disparity in the peaks of the absorption bands of calcium carbonate and calcium hydroxide. The treatment slowed the alkaline hydrolysis and mineralisation of the fibre cell walls in the interfacial transition zone, thus promoting cement hydration. The second part of this work was a thermophysical study of the composites. The inclusion of sisal fibres led to remarkable decreases in thermal conductivity and heat capacity. The best thermal properties were obtained for the composite with sisal fibre immersed in paraffin oil. Biomortars with treated sisal fibre are thus promising from an insulation point of view.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135548630","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

Computational study of multiphase flow in cement plant gas conditioning towers: a review 水泥厂气体调节塔多相流计算研究综述

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-08-09 DOI: 10.1680/jadcr.22.00128

Mohammad Hossein Abbaszadeh, J. Sepahi-Younsi

{"title":"Computational study of multiphase flow in cement plant gas conditioning towers: a review","authors":"Mohammad Hossein Abbaszadeh, J. Sepahi-Younsi","doi":"10.1680/jadcr.22.00128","DOIUrl":"https://doi.org/10.1680/jadcr.22.00128","url":null,"abstract":"Gas conditioning or cooling towers have broad industrial applicability, especially in the cement industry. Most cement factories deal with the same problems as others do. However, the solutions to these problems are barely internationally published and have not received much attention, which results in spending a lot of time and money researching the previous solutions. Iran is among the top ten cement manufacturing countries in the world. Therefore, many of these problems have occurred in Iranian cement factories. The purpose of the present paper is to provide a review of studies in this field over the last decades, with a particular focus on advances in Iran. This paper concludes the most important findings of the literature to suggest the best possible solutions for improving the performance and lifetime of gas conditioning towers and for decreasing the common problems, such as dust build-up and wet bottom. Furthermore, the paper reviews the numerical methods for modelling different aspects of these towers. The results can also be used to reduce water and energy consumption, air pollution, and repair and maintenance costs of cement factories.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43209892","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

Compressive strength in cement mortars via impulse excitation technique and genetic algorithm 基于脉冲激励技术和遗传算法的水泥砂浆抗压强度研究

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-08-09 DOI: 10.1680/jadcr.23.00031

Muftah Mohamed Baroud, Arif Sari, S. S. Abdullaev, M. Samavatian, V. Samavatian

{"title":"Compressive strength in cement mortars via impulse excitation technique and genetic algorithm","authors":"Muftah Mohamed Baroud, Arif Sari, S. S. Abdullaev, M. Samavatian, V. Samavatian","doi":"10.1680/jadcr.23.00031","DOIUrl":"https://doi.org/10.1680/jadcr.23.00031","url":null,"abstract":"Compressive strength, a crucial mechanical property of cement mortars, is typically measured destructively. However, there is a need to evaluate the strength of unique cement-based samples over various aging periods without causing damage. This study proposes a predictive framework using a genetic algorithm to estimate the compressive strength of ordinary cement-based mortars based on their dynamic elastic modulus, measured non-destructively using the impulse excitation technique. By combining the Popovics and Lydon-Balendran models, the static elastic modulus of the samples is calculated with constant coefficients, representing an equivalent compressive strength. The genetic algorithm is employed to determine the optimal values for these coefficients. The results show that the combining model is more sensitive to the Lydon-Balendran approach within the middle range of the dynamic Young's modulus, while the Popovics-based strength dominates at higher and lower dynamic Young's modulus levels. The model exhibits a low root mean square error (RMSE) value of 3.1%. The findings suggest that this non-destructive model has potential as a candidate for predicting the mechanical properties of cement mortars in the industry. It enables efficient evaluation of compressive strength without destructive testing, offering advantages for assessing cement-based materials reliably.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47421838","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

Potential of NaCl solution as mixing water in siliceous minerals modified calcium aluminate cement 氯化钠溶液在硅质矿物改性铝酸钙水泥中的混水潜力

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-08-01 DOI: 10.1680/jadcr.23.00009

Yue Zhou, Yuting Chen, Zhongping Wang, Zheyu Zhu, Linglin Xu

{"title":"Potential of NaCl solution as mixing water in siliceous minerals modified calcium aluminate cement","authors":"Yue Zhou, Yuting Chen, Zhongping Wang, Zheyu Zhu, Linglin Xu","doi":"10.1680/jadcr.23.00009","DOIUrl":"https://doi.org/10.1680/jadcr.23.00009","url":null,"abstract":"Given the advantages of calcium aluminate cement (CAC) in specific marine engineering, selecting materials directly from the sea when mixing CAC can cut down the construction costs and reduce the ecological pollution to the sea. However, the investigation of using seawater as the mixing water of CAC is still trekking with difficult on account of the strength reduction. In this regard, this paper evaluated the possibility of using NaCl solution as mixing water and diatomite as SCMs to modify CAC. Silica fume (SF) and the corrosion by immersion in NaCl solution is employed as the reference. The strength, mass, and length changes of CAC mortars at both 20 °C and 40 °C were tested, and the phase assemblages and morphology were characterized by XRD, TG-DSC and SEM. Results reveal that using NaCl solution as the mixing water is beneficial to the later strength development of CAC, which promotes the formation of C2ASH8 in CAC pastes and exhibits no strength retraction even at 40 °C. The strength of the diatomite/SF modified CAC mortars mixing with NaCl solution is all higher than that immersed in NaCl solution. By contrast, the cooperation effect of diatomite and NaCl solution can significantly increase the strength of CAC, especially at 20 °C. And diatomite favors strength development of CAC mortars, while SF contributes to a better mass and length stability.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41786405","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

Phase volumes of ultra high performance concrete containing nanoscale pozzolan 含纳米级火山灰的超高性能混凝土的相体积

4区工程技术

Advances in Cement Research Pub Date : 2023-08-01 DOI: 10.1680/jadcr.21.00069

A. Korpa, N. Dhamo, A. Andoni, C. Pritzel

{"title":"Phase volumes of ultra high performance concrete containing nanoscale pozzolan","authors":"A. Korpa, N. Dhamo, A. Andoni, C. Pritzel","doi":"10.1680/jadcr.21.00069","DOIUrl":"https://doi.org/10.1680/jadcr.21.00069","url":null,"abstract":"Grid nanoindentation and quantitative X-ray diffraction are employed to provide quantitative information on phase constituents of nanoscale pozzolan-containing ultra-high-performance concrete (UHPC). Three UHPC samples containing nanoscale pozzolan and cured with and without microwave energy are investigated. The volume fraction of each phase constituent is independently evaluated using both techniques: nanoindentation (NI) and quantitative X-ray diffraction (QXRD). For the NI, the volumes have been evaluated by taking into account the thresholds characterising the phase constituents. The NI could assess phase mixtures or composites rather than single phases. The microwave-cured samples (CMW and CPMW) contain in total more hydration products that the sample that was not cured with microwave energy (C000). In all three samples, a nanocomposite (C–S–H/CHnm) consisting of high-density (HD) calcium silicate hydrate (C–S–H) and nanoscale portlandite (CH) is included, and its amount is more than double for the pressure-compacted and microwave-cured sample (CPMW). The heat curing by microwave energy together with the very low amount of water and restriction of the available space for hydration products, favour the formation of the nanocomposite (C–S–H/CHnm) in the CPMW sample.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134951516","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

Improving capillary water absorption of high-volume fly ash mortar by curing temperature and limestone addition 通过养护温度和石灰石的加入改善大体积粉煤灰砂浆的毛细吸水率

4区工程技术

Advances in Cement Research Pub Date : 2023-07-27 DOI: 10.1680/jadcr.23.00025

Yunfei Di, Haitao Zhao, Xiaoxiong Li, Yun Chen, Zhenqing Shi, Xiaolei Man

引用次数: 0

Microstructure and physical properties of fly ash-based geopolymer with expanded vermiculite addition 掺有膨胀蛭石的粉煤灰基地聚合物的微观结构和物理性能

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-07-12 DOI: 10.1680/jadcr.23.00006

Yi Huang, Xiangdong Qing, Li Lin, Bicai Li, Lin Xu, Ying-lin Peng

{"title":"Microstructure and physical properties of fly ash-based geopolymer with expanded vermiculite addition","authors":"Yi Huang, Xiangdong Qing, Li Lin, Bicai Li, Lin Xu, Ying-lin Peng","doi":"10.1680/jadcr.23.00006","DOIUrl":"https://doi.org/10.1680/jadcr.23.00006","url":null,"abstract":"Fly ash-based geopolymer paste with expanded vermiculite (EV) powder addition was synthesized and its microstructure, compressive strength, setting time, moisture control, efflorescence extent and thermal conductivity were studied. The results showed that EV addition resulted in the increase of standard consistency water consumption and setting time. As a consequence, its excessive addition caused a larger amount of harmful pores, which was detrimental for compressive strength of geopolymer paste. However, geopolymer pastes with an appropriate amount of EV addition (2-7 wt%) presented a slight increase of compressive strength because of the filler effect. Mg2+ and Fe2+diffused from EV interlayer through ions exchange between EV and geoploymer solution participated in geopolymerization. This was reflected by the formation of N-(M)-A-(F)-S-H evidenced through SEM-EDS and FITR analyis. In addition, Na2+/Mg2+or Na2+/Fe2+ ions exchange reduced the mobility of Na2+and therefore decreased the efflorescence extent. Moreover, EV addition favored the improvement of moisture control and thermal conductivity properties of geopolymer paste.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48226627","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

Early hydration studies of cementitious materials incorporating nanoalumina 含纳米氧化铝胶凝材料的早期水化研究

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-07-10 DOI: 10.1680/jadcr.22.00190

Usha Sharma, Reetam Chaudhury, Lok Pratap Singh, Chi-Sun Poon

{"title":"Early hydration studies of cementitious materials incorporating nanoalumina","authors":"Usha Sharma, Reetam Chaudhury, Lok Pratap Singh, Chi-Sun Poon","doi":"10.1680/jadcr.22.00190","DOIUrl":"https://doi.org/10.1680/jadcr.22.00190","url":null,"abstract":"Concrete technologists use different types of additives such as fly ash, slag, natural pozzolans and nanomaterials toenhance concrete performance and durability. However, a detailed explanation of the early-age hydration process and microstructural modification of concrete in the presence of nanomaterials remains to be presented and extensive research is required for strategic modification of cementitious systems. This study focused on the precise monitoring of early-age hydration with the incorporation of nanoalumina (nAl) in tricalcium silicate (C<sub>3</sub>S) and Portland cement paste and mortar. The dosage of nAl was varied from 1 to 5% (by weight) in C<sub>3</sub>S and from 0.1 to 1.0% in Portland cement, with a water/cement ratio of 0.4. The hydration studies showed that the nAl increased the cross-linkage in calcium silicate hydrate gel through substitution of aluminium by silicon, which was responsible for the enhancement of the modulus of elasticity (by 40%) with 1.0% nAl) after 7 days of hydration. In summary, the incorporation of nAl modified the concrete microstructure in the initial days of hydration, leading to higher concrete performance and longer service lives of concrete structures.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138509761","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

Phase evolution and burnability of cement raw meal 水泥生料的物相演变与易烧性

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-07-04 DOI: 10.1680/jadcr.23.00034

José Aguirre Castillo, M. Broström, M. Eriksson

引用次数: 0