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Effect of microwave curing on the hydration properties of cement-based material containing glass powder

机译：微波固化对含玻璃粉水泥基材料水化性能的影响

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摘要

The effects of microwave curing on the hydration of cement-based materials containing coarse glass powder were studied by performing compressive strength, XRD, TG-DSC, SEM-EDS and MIP analysis. The results showed that microwave curing could effectively improve the early-age compressive strength of mortar prepared with composite binder containing coarse glass powder. Microwave curing accelerated the hydration of cement particles by dissolution of Na+ from glass powder and thermal effect. Although microwave curing increased the porosity slightly at the early age, the porosity of pores larger than 50 nm did not increase, which has little effect on the decrease of compressive strength. Additionally, microwave curing increased the connection of aggregate, CH, hydrated glass powder and cement particles by reticular C-S-H, leading to a denser microstructure of the interfacial transition zone of mortar. The adsorption of Na+ by alkali-silica reaction gel under microwave curing reduced the adverse effect of Na+ on the late hydration of cement and the compressive strength. But the total porosity of mortar under microwave curing was increased by the increase of pores in the range of 50-100 nm, which goes against the improvement of compressive strength. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通过进行抗压强度，XRD，TG-DSC，SEM-EDS和MIP分析，研究了微波固化对含粗玻璃粉的水泥基材料水化的影响。结果表明，微波固化能有效提高含粗玻璃粉复合粘结剂制备砂浆的早期抗压强度。微波固化通过玻璃粉中Na +的溶解和热效应加速了水泥颗粒的水合作用。尽管微波固化在早期使孔隙率略有增加，但是大于50 nm的孔的孔隙率并未增加，这对降低抗压强度几乎没有影响。此外，微波固化通过网状C-S-H增加了骨料，CH，水合玻璃粉和水泥颗粒的连接，从而导致砂浆界面过渡区的致密微观结构。微波固化下碱-硅反应凝胶对Na +的吸附减少了Na +对水泥后期水化和抗压强度的不利影响。但是，随着50-100nm范围内孔隙的增加，砂浆在微波固化下的总孔隙率增加，这不利于抗压强度的提高。 （C）2017 Elsevier Ltd.保留所有权利。

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