The effect of seawater curing on properties of magnesium potassium phosphate cement
The effect of seawater curing on properties of magnesium potassium phosphate cement
复制标题
海水养护对磷酸镁钾水泥性能的影响
DOI：
10.1016/j.conbuildmat.2017.02.057
复制
发表时间：
2017-06-15
影响因子：
7.4
通讯作者：
Sun, Zhixiang
中科院分区：
文献类型：
--
作者：
Yang, Jianming;Tang, Qingqing;Sun, Zhixiang
研究了早期海水养护对磷酸镁钾水泥(MKPC)浆体性能的影响。首先，将过烧氧化镁粉、磷酸二氢钾、复合缓凝剂(CR)和水按一定比例混合制成MKPC浆体。然后，测定了不同养护条件下混凝土的抗压强度、干缩变形和质量变化。研究结果如下：在海水养护条件下，MKPC浆体试件在海水中浸泡前的水化龄期对其抗压强度、干缩和质量增长有显著影响。在海水中养护3d的MKPC浆体试件，其28d和60d的抗压强度分别是相同水化龄期的天然养护条件下MKPC浆体试件的112.8%和105.4%。此外，在自然养护条件下，它们的60d收缩应变(0.82x10(-4))明显小于相同水化龄期的MKPC浆体试件(5.14x10(-4))。此外，它们还具有较高的质量增长率(1.23%)。这是由于在海水中浸泡3d的MKPC样品中MKP晶体的产率、结晶度和缺陷较少，并且孔径分布更理想。(C)2017爱思唯尔有限公司。保留所有权利。
This paper investigated the effect of early seawater curing on properties of magnesium potassium phosphate cement (MKPC) paste. First, the MKPC paste was prepared by mixing overburning MgO powders, KH2PO4, the composite retarder (CR) and water in a certain proportion. Then, we measured the compressive strength, drying shrinkage deformation, and mass change of it under different curing conditions. The results were as follows. For MKPC paste specimens under seawater curing condition, the hydration ages before they were soaked in seawater had a significant effect on their compressive strength, drying shrinkage and mass increase. For MKPC paste specimens cured in seawater after 3-day natural curing, their 28 day and 60-day compressive strengths were 112.8% and 105.4% of those of MKPC paste specimens with same hydration ages under natural curing condition, respectively. In addition, the 60-day shrinkage strain of them (0.82 x 10(-4)) was significantly less than that of MKPC paste specimens with the same hydration age under natural curing condition (5.14 x 10(-4)). Moreover, they had higher mass increase ratio (1.23%). These were due to higher production, higher degree of crystallinity and less defects of MKP crystals, and more perfect pore size distribution in MKPC specimens soaked in seawater after 3-day natural curing. (C) 2017 Elsevier Ltd. All rights reserved.