Liu Kuisheng, Ma Shanliang, Zhang Zengqi, Han Fanghui
Beijing Urban Construction Group Co., Ltd., Beijing 100084, China.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel). 2022 Jan 25;15(3):918. doi: 10.3390/ma15030918.
Magnesium potassium phosphate cement (MKPC) is an excellent rapid repair material for concrete, and many mineral admixtures have been applied to promote its performance. This study focuses on the quantitative characterization of the physical and chemical contributions of granulated blast-furnace slag with various finenesses to the performance development of MKPC. It was found that the addition of slag could increase the setting time, which is mainly due to the dilution of cement. Fine slag tends to decrease the fluidity of MKPC mortar. The physical contributions of ordinary and ultrafine slag to the early performance of MKPC mortar are 23% and 30%, while the chemical contributions are only 6%~10%. At late ages, the physical contribution is less than 10% and the chemical contribution of slag is even slightly negative. The addition of slag is beneficial to the compact packing of MKPC, which is the main reason for the physical contribution. Slag could react in the MKPC system, and increasing the fineness significantly promotes the reaction kinetics.
磷酸镁钾水泥（MKPC）是一种优异的混凝土快速修复材料，许多矿物掺合料已被用于改善其性能。本研究重点对不同细度的粒化高炉矿渣对MKPC性能发展的物理和化学贡献进行定量表征。研究发现，矿渣的加入会延长凝结时间，这主要是由于对水泥的稀释作用。细矿渣往往会降低MKPC砂浆的流动性。普通矿渣和超细矿渣对MKPC砂浆早期性能的物理贡献分别为23%和30%，而化学贡献仅为6%~10%。在后期，物理贡献小于10%，矿渣的化学贡献甚至略显负值。矿渣的加入有利于MKPC的紧密堆积，这是物理贡献的主要原因。矿渣可在MKPC体系中发生反应，提高细度可显著促进反应动力学。
