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基于双气氛TG-DSC的EVA改性水泥浆体氢氧化钙含量定量分析

Quantitative Analysis of the Calcium Hydroxide Content of EVA-Modified Cement Paste Based on TG-DSC in a Dual Atmosphere.

作者信息

Zhang Zhenlei, Du Jiang, Shi Meilun

机构信息

Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai 201804, China.

School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.

出版信息

Materials (Basel). 2022 Apr 4;15(7):2660. doi: 10.3390/ma15072660.

DOI:10.3390/ma15072660
PMID:35407992
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9000620/
Abstract

The calcium hydroxide (Ca(OH)) content is one of the main indices of cement hydration degree. In order to accurately determine the calcium hydroxide content of ethylene and vinyl acetate (EVA) copolymer-modified cement paste, a dual atmosphere thermogravimetric method (first in an oxidizing atmosphere and then in an inert atmosphere) was used to track the mass loss and change in enthalpy by TG-DSC (simultaneous thermogravimetry and differential scanning calorimetry). The results showed that using the dual atmosphere thermogravimetric method, the source of mass loss can be distinguished. The exothermic peaks in an oxidizing atmosphere show the oxidation reactions of EVA, while the endothermic peak in an inert atmosphere is due to the pyrolysis reaction of EVA and the decomposition of the calcium hydroxide. The influence of EVA on cement hydration was investigated. The results showed that the polymer powder can be dispersed in water, forming a kind of composite membrane. The test method of dual atmosphere thermogravimetry to measure the calcium hydroxide content of polymer-modified cement pastes is more accurate and convenient than those previously applied.

摘要

氢氧化钙（Ca(OH)）含量是水泥水化程度的主要指标之一。为了准确测定乙烯-醋酸乙烯酯（EVA）共聚物改性水泥浆体中的氢氧化钙含量，采用双气氛热重法（先在氧化气氛中，然后在惰性气氛中）通过TG-DSC（同步热重分析和差示扫描量热法）跟踪质量损失和焓变。结果表明，采用双气氛热重法可以区分质量损失的来源。氧化气氛中的放热峰表明EVA的氧化反应，而惰性气氛中的吸热峰是由于EVA的热解反应和氢氧化钙的分解。研究了EVA对水泥水化的影响。结果表明，聚合物粉末可分散在水中，形成一种复合膜。双气氛热重法测量聚合物改性水泥浆体中氢氧化钙含量的测试方法比以前应用的方法更准确、方便。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/4dbd7f557567/materials-15-02660-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/b515ddb32119/materials-15-02660-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/e51e2bb80295/materials-15-02660-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/9b8c5f07d474/materials-15-02660-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/671f11466eed/materials-15-02660-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/3c0bc79f1676/materials-15-02660-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/bbbfb3107f86/materials-15-02660-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/7f30e7be74e8/materials-15-02660-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/4dbd7f557567/materials-15-02660-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/b515ddb32119/materials-15-02660-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/e51e2bb80295/materials-15-02660-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/ce13320a40d7/materials-15-02660-g003a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/9b8c5f07d474/materials-15-02660-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/671f11466eed/materials-15-02660-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/3c0bc79f1676/materials-15-02660-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/bbbfb3107f86/materials-15-02660-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/7f30e7be74e8/materials-15-02660-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a01c/9000620/4dbd7f557567/materials-15-02660-g009.jpg

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