Mechanism analysis and effect of styrene–acrylate copolymer powder on cement hydrates
Mechanism analysis and effect of styrene–acrylate copolymer powder on cement hydrates
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DOI：
10.1016/j.conbuildmat.2012.12.028
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发表时间：
2013-04
影响因子：
7.4
通讯作者：
Ru Wang;L. Yao;Pei-ming Wang
中科院分区：
文献类型：
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作者：
Ru Wang;L. Yao;Pei-ming Wang
采用苯乙烯-丙烯酸酯共聚物（SAE）粉体对波特兰水泥浆体进行改性。使用X射线衍射（XRD）研究了水化产物的浓度。并利用傅里叶变换红外光谱仪（FTIR）研究了改性过程中发生的物理化学作用。结果表明，SAE粉末的加入促进了钙矾石（AFt）的形成。7 d后水泥浆体中开始出现水化产物水合铝酸四钙（C4 AH 13），其生成量随SAE粉灰比（mp/mc）的增加而略有减少。7天后水泥浆体中也开始出现单硫水化硫铝酸钙（AFm），但其含量很少。此外，随着mp/mcis增加，水合水泥浆中氢氧化钙（Ca（OH）2）的量减少，这种效果在早期更加明显。FTIR分析表明，含SAE粉的水泥浆体在水化过程中形成了Ca 2 +-羧基络合物。
In this paper a styrene–acrylate copolymer (SAE) powder was used to modify Portland cement paste. The concentration of the products of hydration was investigated using X-ray diffraction (XRD). Also the physical and chemical interactions occurring in the modification process were studied using Fourier-transform infrared spectrometer (FTIR). The results show that the addition of SAE powder facilitates the formation of ettringite (AFt). The hydration product tetracalcium aluminate hydrate (C4AH13) begins to appear in the cement paste after 7days, its formation slightly decreases with an increase in the SAE powder–cement ratio (mp/mc). Single-sulfur hydrated calcium sulphoaluminate (AFm) is also found in the cement paste beginning after 7days; however its content is very small. Also as the mp/mcis increased the amount of calcium hydroxide (Ca(OH)2) in the hydrating cement paste decreases, this effect is more pronounced at earlier ages. FTIR analysis indicates that Ca2+–carboxyl complexes form during the hydration of cement paste containing SAE powder.