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水泥类型和超吸水性聚合物对可持续超高性能浆料性能的影响。

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste.

作者信息

Xuan Mei-Yu, Wang Yi-Sheng, Wang Xiao-Yong, Lee Han-Seung, Kwon Seung-Jun

机构信息

Department of Architectural Engineering, Kangwon National University, Chuncheon-si 24341, Korea.

Department of Integrated Energy and Infra System, Kangwon National University, Chuncheon-si 24341, Korea.

出版信息

Materials (Basel). 2021 Mar 18;14(6):1497. doi: 10.3390/ma14061497.

DOI:10.3390/ma14061497
PMID:33803837
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8003292/
Abstract

This study focuses on the effects of superabsorbent polymers (SAP) and belite-rich Portland cement (BPC) on the compressive strength, autogenous shrinkage (AS), and micro- and macroscopic performance of sustainable, ultra-high-performance paste (SUHPP). Several experimental studies were conducted, including compressive strength, AS, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), attenuated total reflectance (ATR)-Fourier-transform infrared spectroscopy (FTIR), ultra-sonic pulse velocity (UPV), and electrical resistivity. The following conclusions can be made based on the experimental results: (1) a small amount of SAP has a strength promotion effect during the first 3 days, while BPC can significantly improve the strength over the following 28 days. (2) SAP slows down the internal relative humidity reduction and effectively reduces the development of AS. BPC specimens show a lower AS than other specimens. The AS shows a linear relationship with the internal relative humidity. (3) Specimens with SAP possess higher cumulative hydration heat than control specimens. The slow hydration rate in the BPC effectively reduces the exothermic heat. (4) With the increase in SAP, the calcium hydroxide (CH) and combined water content increases, and SAP thus improves the effect on cement hydration. The contents of CH and combined water in BPC specimens are lower than those in the ordinary Portland cement (OPC) specimen. (5) All samples display rapid hydration of the cement in the first 3 days, with a high rate of UPV development. Strength is an exponential function of UPVs. (6) The electrical resistivity is reduced due to the increase in porosity caused by the release of water from SAP. From 3 to 28 days, BPC specimens show a greater increment in electrical resistivity than other specimens.

摘要

本研究聚焦于高吸水性聚合物（SAP）和富贝利特波特兰水泥（BPC）对可持续超高性能浆料（SUHPP）的抗压强度、自收缩（AS）以及微观和宏观性能的影响。进行了多项实验研究，包括抗压强度、AS、等温量热法、X射线衍射（XRD）、热重分析（TGA）、衰减全反射（ATR）-傅里叶变换红外光谱（FTIR）、超声脉冲速度（UPV）和电阻率。基于实验结果可得出以下结论：（1）少量SAP在最初3天具有强度促进作用，但BPC能在接下来的28天显著提高强度。（2）SAP减缓了内部相对湿度的降低，并有效减少了AS的发展。BPC试件的AS低于其他试件。AS与内部相对湿度呈线性关系。（3）含SAP的试件比对照试件具有更高的累积水化热。BPC中的缓慢水化速率有效降低了放热热量。（4）随着SAP含量的增加，氢氧化钙（CH）和结合水含量增加，因此SAP改善了对水泥水化的影响。BPC试件中CH和结合水的含量低于普通波特兰水泥（OPC）试件。（5）所有样品在最初3天水泥水化迅速，UPV发展速率高。强度是UPV的指数函数。（6）由于SAP释放的水分导致孔隙率增加，电阻率降低。从3天到第28天，BPC试件的电阻率增量比其他试件更大。

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