Effect of Superabsorbent Polymer (SAP) Internal Curing Agent on Carbonation Resistance and Hydration Performance of Cement Concrete
Effect of Superabsorbent Polymer (SAP) Internal Curing Agent on Carbonation Resistance and Hydration Performance of Cement Concrete
复制标题
高吸水性聚合物（SAP）内固化剂对水泥混凝土抗碳化及水化性能的影响
DOI：
10.1155/2022/3485373
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发表时间：
2022-05-29
影响因子：
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通讯作者：
Xie, Zhengzhuan
中科院分区：
文献类型：
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作者：
Xu, Jieting;Qin, Xiao;Xie, Zhengzhuan
为明确高吸水性聚合物（SAP）内固化剂对水泥混凝土抗碳化性能的影响机理，进行了加速碳化试验，探讨SAP粒径和掺量对碳化深度的影响。采用傅里叶变换红外光谱（FTIR）和x射线衍射（XRD）试验研究了不同龄期内养护混凝土的水化性能。结合扫描电镜（SEM）试验，分析了内部养护对混凝土微观结构的水化填充效应；同时揭示了SAP对抗碳化性能的影响机理。结果表明：(1)当SAP粒径为100目、掺量为0.200%时，第28天内固化混凝土碳化深度仅为对照组的56.5%；（ii）在FTIR光谱中，sap混凝土的Ca(OH)2吸收峰面积比对照组增加了3.38倍，更多的C2S和C3S被转化为Ca(OH)2，有助于提高水泥混凝土的水化程度；（iii）第56天水化产物显著增加，SAP凝胶形成的剩余孔隙逐渐被水化产物填充，增强了水泥混凝土的密实度和抗碳化性能。
To clarify the influencing mechanism of superabsorbent polymer (SAP) internal curing agent on the carbonation resistance of cement concrete, accelerated carbonation experiment was conducted to explore the effect of particle size and dosage of SAP on carbonation depth. The hydration performance of internally cured concrete at different ages was studied by Fourier transform infrared spectroscopy (FTIR) test and X-ray diffraction (XRD) test. Combined with the scanning electron microscope (SEM) test, the hydration filling effect of internal curing on the microstructure of concrete was analyzed; meanwhile, the influence mechanism of SAP on carbonation resistance was revealed. The results showed that (i) when the particle size and dosage of SAP were 100 mesh and 0.200%, the carbonation depth of internally cured concrete was only 56.5% of the control group on day 28; (ii) the Ca(OH)2 absorption peak area of SAP-concrete in the FTIR spectra could be increased by 3.38 times than that of the control group, and more C2S and C3S were translated into Ca(OH)2, which helped to improve the hydration degree of cement concrete; (iii) the hydration products of day 56 were increased significantly and the remaining pores formed by SAP gels were gradually filled by hydration products, which enhanced the compactness and carbonation resistance of cement concrete.