Advances in Cement Research最新文献_第7页

Effect of recycled oyster shell powder on hydration and strength development of magnesium phosphate cement 再生牡蛎壳粉对磷酸镁水泥水化及强度发展的影响

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-06-27 DOI: 10.1680/jadcr.22.00103

Bingcong Chen, Junping Zhang, Airong Liu, Liwen Zhang, Zhujian Xie, Xiaowei Ouyang, Z. Ma

{"title":"Effect of recycled oyster shell powder on hydration and strength development of magnesium phosphate cement","authors":"Bingcong Chen, Junping Zhang, Airong Liu, Liwen Zhang, Zhujian Xie, Xiaowei Ouyang, Z. Ma","doi":"10.1680/jadcr.22.00103","DOIUrl":"https://doi.org/10.1680/jadcr.22.00103","url":null,"abstract":"Using oyster shell powder (OSP) to prepare magnesium phosphate cement (MPC) not only reduces the pollution caused by the wasted oyster shell disposal, but also benefits the development of more environmentally friendly cement. The effect of OSP on the hydration and strength development of MPC was studied. An axial compression experiment including 45 cuboid specimens was executed to investigate the compressive strength, failure mode, stress–strain relationship, and energy absorption of MPC mixing with different mass contents (0% to 12%) of OSP over the curing times of 7, 14, and 28 days. Scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy were utilized for measuring the variation of MPC microstructure and hydration products caused by OSP. Results indicated that a new reactant CaHPO4·2H2O was formed, which optimized matrix strength. The substitution of OSP could reduce the cost of MPC by 2–9% without decreasing the strength. Compared with MPC without OSP, the compressive strength of the specimen with 3% OSP is increased by 6%. However, with the continuous increase of OSP, the compressive strength gradually decreases. Similarly, the elastic modulus of MPC increases first and then decreases with the increase of OSP.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46802881","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

Molecular dynamics study on the adsorption of radioactive ions by geopolymers 地质聚合物吸附放射性离子的分子动力学研究

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-06-19 DOI: 10.1680/jadcr.22.00085

Y. Tu, Tongfang Wang, Rongjiang Wen, Jie Cao, M. Fang, Chao Wang, G. Sas, L. Elfgren

{"title":"Molecular dynamics study on the adsorption of radioactive ions by geopolymers","authors":"Y. Tu, Tongfang Wang, Rongjiang Wen, Jie Cao, M. Fang, Chao Wang, G. Sas, L. Elfgren","doi":"10.1680/jadcr.22.00085","DOIUrl":"https://doi.org/10.1680/jadcr.22.00085","url":null,"abstract":"The construction of nuclear power plants necessitates careful consideration of the discharge and fixation of nuclear waste. Geopolymers are new cement-based materials (CBMs) with three-dimensional cage-like structures that enable effective nuclear waste fixation. In this work, the adsorption of radioactive caesium and strontium ions by sodium aluminosilicate hydrate (NASH) gel, the main component of geopolymers, was investigated using molecular dynamics simulations to obtain nanoscale insights into the ions’ interactions with the gel. The formation of strong ion–oxygen bonds allowed both ions to be effectively adsorbed on the NASH surface, but the adsorption ratio of strontium ions (17.2%) was slightly lower than that of caesium ions (21.0%). Because strontium ions are divalent, they can form stronger electrostatic interactions with water molecules and chloride ions, which hinders their approach to the interface. For the same reason, the diffusion coefficient of strontium ions in solution is lower than that of caesium ions. These results provide new insights into the nuclear waste fixation capacity of NASH gel and guidance for the design of new CBMs for radioactive waste disposal.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49478510","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

Fingerprinting Portland cements by means of 87Sr/86Sr and 143Nd/144Nd isotope ratios and geochemical profiles 利用87Sr/86Sr和143Nd/144Nd同位素比值及地球化学剖面对硅酸盐胶结物进行指纹鉴定

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-06-13 DOI: 10.1680/jadcr.23.00018

A. Kazlagić, Stephan Dietmar, M. Ostermann, A. Possolo, J. Vogl

{"title":"Fingerprinting Portland cements by means of 87Sr/86Sr and 143Nd/144Nd isotope ratios and geochemical profiles","authors":"A. Kazlagić, Stephan Dietmar, M. Ostermann, A. Possolo, J. Vogl","doi":"10.1680/jadcr.23.00018","DOIUrl":"https://doi.org/10.1680/jadcr.23.00018","url":null,"abstract":"This study uses conventional 87Sr/87Sr and 87Nd/87Nd isotope and interelement ratios of Ca, Sr, K, Mn, Mg, and Ti as fingerprints for ordinary Portland cements (OPC) provenancing. Herein, the first database of Sr and Nd isotope ratios investigated in OPCs stemming from twenty-nine cement plants located worldwide was created. The results show that the Sr isotope ratios of OPCs are higher than those of seawater from the observed geological period. The spread of 87Nd/87Nd in OPCs is not as large as the spread for 87Sr/87Sr isotope ratios. However, the combination of both Sr and Nd isotope ratios provides the potential for distinguishing between cements of different production sites. Most of the investigated OPCs have measurable differences in their 87Sr/87Sr and 87Nd/87Nd isotope ratios, which can be employed as a valuable analytical fingerprinting tool. In the case of equivocal results, Divisive Hierarchical Clustering was employed to help overcome this issue. The construction of geochemical profiles allowed computing suitably defined distances between cements and clustering them according to their chemical similarity. By applying this methodology, successful fingerprinting was achieved in 27 out of 29 analysed ordinary Portland cements.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43492288","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

Analysis of the evolution of internal corrosion cracks in RMOCC compared with GLCM and SVM RMOCC内部腐蚀裂纹演化与GLCM和SVM的比较分析

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-05-15 DOI: 10.1680/jadcr.22.00070

Penghui Wang, Hongxia Qiao, Qiong Feng, C. Xue

{"title":"Analysis of the evolution of internal corrosion cracks in RMOCC compared with GLCM and SVM","authors":"Penghui Wang, Hongxia Qiao, Qiong Feng, C. Xue","doi":"10.1680/jadcr.22.00070","DOIUrl":"https://doi.org/10.1680/jadcr.22.00070","url":null,"abstract":"In view of the difficulty of identifying internal micro corrosion-induced cracks in concrete and the poor accuracy of quantitative analysis that results in inaccurate results of the formation law of internal cracks, RMOCC was subjected to a galvanostatic acceleration test, and X-CT technology was combined with the Support Vector Machines (SVM) identification algorithm and Grey-Level Co-Occurrence Matrix (GLCM) theory. Using the SVM algorithm and GLCM theory, the internal average crack width of concrete and the contrast, correlation, angular second moment (ASM), and inverse difference moment (IDM), which characterize the change in slice texture information, were used as degradation parameters, respectively. Using the average internal crack width and IDM as the degradation index, a reliability degradation competition failure analysis was conducted to study RMOCC's internal crack formation law. The results showed that the SVM algorithm had a greater than 95% accuracy in recognizing cracks. In the entire corrosion-induced crack formation process, IDM and the average internal crack width values were consistent with the normal distribution. Through reliability degradation competition failure analysis between IDM and the average crack width value, the average crack width calculated with SVM is more suitable for the degradation analysis of internal corrosion-induced cracks in RMOCC.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44421962","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

Enhancement of geopolymerization reactivity and thermal resistance using mixed types of fly ash 使用混合型粉煤灰提高地质聚合反应性和耐热性

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-05-05 DOI: 10.1680/jadcr.22.00079

Viengsai Phavongkham, S. Wattanasiriwech, D. Wattanasiriwech

引用次数: 0

Cryogenic cooling using liquid nitrogen in production of massive concrete: temperature profile, setting time and compressive strength 大体积混凝土生产中使用液氮的低温冷却：温度分布、凝结时间和抗压强度

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-05-05 DOI: 10.1680/jadcr.23.00003

M. I. Alamayreh, Rana A. M. Alhorani, S. Bazlamit

{"title":"Cryogenic cooling using liquid nitrogen in production of massive concrete: temperature profile, setting time and compressive strength","authors":"M. I. Alamayreh, Rana A. M. Alhorani, S. Bazlamit","doi":"10.1680/jadcr.23.00003","DOIUrl":"https://doi.org/10.1680/jadcr.23.00003","url":null,"abstract":"Various cooling methods of concrete mixtures are used in mass concrete structures to reduce concrete's thermal cracking and enhance the structures’ integrity. In concrete production, mixing cement with water is associated with hydration heat generation, which may cause concrete mixes to dry out and crack. The experimental work aims to evaluate the effects of using liquid nitrogen (LN) in cooling mortar mixes and concrete. LN was used in doses of 0, 25, 50, 75, and 100% by water volume to either cool the mixing water at T = 4 °C or to inject it into concrete mixtures directly. The proportions of concrete mixtures were based on ACI PRC-207.1-21 for mass concrete. Measurements of the mortars’ initial and final setting times and temperatures indicated that more LN% delayed the hardening process, so the peak hardening rates occurred later, exhibiting a slowdown of the cement hydration. LN cooling enhances the mortar and concrete cubes’ compressive strength when VLN/Vwater≤1. However, concrete compressive strength decreased due to the appearance of ice lenses that turn into voids when VLN/Vwater>1. Cooling concrete with chilled water (at T = 4°C) showed a 30% increase in the mortar cubes’ compressive strength and a maximum of 16.45% when injecting LN into the mixes. The concrete compressive strength increased by 34.51% and 12.97% when mixed with cooled water and injected LN into the mixtures, respectively. The slower cooling process promoted better cement hydration in the chilled water method compared to the injection of LN into the concrete mixture.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45488211","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

Improvement of phosphate ester grinding aids on cement grinding and water-reducing performance 磷酸酯助磨剂对水泥粉磨和减水剂性能的改善

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-05-05 DOI: 10.1680/jadcr.23.00017

Li Hu, Fan Yang, Yijia Huang, Kaixuan Yang, Binbin Li

{"title":"Improvement of phosphate ester grinding aids on cement grinding and water-reducing performance","authors":"Li Hu, Fan Yang, Yijia Huang, Kaixuan Yang, Binbin Li","doi":"10.1680/jadcr.23.00017","DOIUrl":"https://doi.org/10.1680/jadcr.23.00017","url":null,"abstract":"Phosphate ester polymers were prepared from phosphate ester monomers for the first time, and their effects on cement grinding and water-reducing as grinding aids were studied. FT-IR, standard viscosity, setting time, mortar fluidity, mortar compressive strength, etc., tested phosphorus series products’ properties. The results show that: (1) Dibutyl hydroxyethyl phosphate can reduce the residue of 45 μm and 80 μm grinding sieves by 68.67% and 98.67%, respectively. (2) By comparing with triethanolamine (TEA). It is found that the grinding effect of hydroxyethyl dibutyl phosphate is not only better, but also the optimal mixing amount is smaller, only 0.167%. Under the same grinding amount, the grinding time can be shortened by 30%, and under the same grinding time, the grinding output can be increased by at least 20%. (3) Polymer grinding aids can significantly improve the fluidity of cement paste by 40.06%, which can make the water-reduction rate of cement mortar reach more than 20%. The experimental results show that as a new generation of grinding aids system, phosphate ester grinding aids not only have a significant grinding effect but also have high molecular designability, which will significantly enrich the grinding aids market and effectively promote energy conservation and emission reduction in the grinding field.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46085484","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

Investigation on water-resistance of basic magnesium sulfate cement containing weak organic acids 含弱有机酸碱性硫酸镁水泥的耐水性研究

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-04-27 DOI: 10.1680/jadcr.22.00192

Xun Xu, Bei Zhu, Tiancheng Lin, Yingjiang Li, Yongtao Sun, B. Yu, Hai-long Hu, Zong-Hai Hu, Qian Dong

引用次数: 1

Rheology of cement-sodium silicate grout containing bentonite and cellulose ether at high temperatures 含膨润土和纤维素醚的水泥-硅酸钠浆液的高温流变性

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-04-27 DOI: 10.1680/jadcr.22.00200

Rentai Liu, Xiuhao Li, Shucai Li, Chunyu Zhang, Mengjun Chen, Canxun Du, Sanlin Du

{"title":"Rheology of cement-sodium silicate grout containing bentonite and cellulose ether at high temperatures","authors":"Rentai Liu, Xiuhao Li, Shucai Li, Chunyu Zhang, Mengjun Chen, Canxun Du, Sanlin Du","doi":"10.1680/jadcr.22.00200","DOIUrl":"https://doi.org/10.1680/jadcr.22.00200","url":null,"abstract":"Cement-sodium silicate (C-S) grout is widely used to control water inrush disasters, and its apparent viscosity considerably impacts its water-plugging effect. However, the traditional grouting materials and methods are inappropriate for high-temperature environments, as high temperatures can affect the grout viscosity. Viscosity-modifying admixtures (VMAs) are used to thicken the grout and increase its apparent viscosity. In this study, two types of bentonite (calcium bentonite, Ca-B, and sodium bentonite, Na-B) and hydroxyethyl methyl cellulose (HEMC) were used to modify the C-S grout, and laboratory tests to evaluate fluidity, gelation time, and rheology were performed. The results showed that both bentonite and HEMC decreased fluidity and prolonged gelation time. HEMC, Ca-B, and Na-B decreased fluidity by 46.8–60.4%, 12.5–31.5%, and 17.7–39.1%, respectively, at different temperatures. HEMC, Ca-B, and Na-B increased gelation time by 23.8–50.1%, 23.3–71.4%, and 20%–57.1%, respectively. Additionally, bentonite can partially resist high temperatures and improve the apparent viscosity of grout owing to its water-absorption capacity. Conversely, HEMC has a negative effect on apparent viscosity, which is attributed to the formation of a complex microstructure resulting from intermolecular crosslinking between the cement particles and HEMC, preventing the connection of sodium silicate.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43507075","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

Utilizing under burnt waste bricks from kilns as supplementary cementitious material 利用窑炉烧成不足的废砖作为辅助胶凝材料

IF 2 4区工程技术

Advances in Cement Research Pub Date : 2023-04-24 DOI: 10.1680/jadcr.22.00170

M. Mohan, Birendra Singh

{"title":"Utilizing under burnt waste bricks from kilns as supplementary cementitious material","authors":"M. Mohan, Birendra Singh","doi":"10.1680/jadcr.22.00170","DOIUrl":"https://doi.org/10.1680/jadcr.22.00170","url":null,"abstract":"This paper studies the pozzolanic performance of Crushed Brick Powder (CBP) obtained by grounding under- burnt waste bricks from a continuous brick kiln. Two different size fractions of CBP considered for cement replacement are CBP1 passing through 150 μm but retained on 75 μm and CBP 2 passing through 75μm. The compressive strength tests on mortar with CBP reveal that strength does not exceed the control; however, 10 - 15% cement replacement by CBP is optimum. A study of the presence of hydrate phases by XRD and quantification of portlandite in the paste samples by TGA up to 90 days confirms the action of pozzolanicity. Further, To determine the feasibility of CBP1 and CBP2 fractions in concrete, M25 grade concrete's strength and carbonation were studied by replacing 45% cement with a combined proportion of CBP1 (20%) and CBP2 (25%). This replacement reduced the concrete grade from M25 to M20 and increased the accelerated carbonation depth. Despite this, the projected natural carbonation coefficient with accelerated carbonation data is determined as low. The utilised CBP is cost-effective as it requires less mechanical processing and is without any chemical activation, and thus it can satisfactorily be used for low-cost housing construction and lower-grade structural and non-structural uses.","PeriodicalId":7299,"journal":{"name":"Advances in Cement Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49335780","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