Synergetic Effect of Expansive Agent (KEA) and Superabsorbent Polymers (SAP) on the Shrinkage, Strength and Pore Structures of Mortars
Synergetic Effect of Expansive Agent (KEA) and Superabsorbent Polymers (SAP) on the Shrinkage, Strength and Pore Structures of Mortars
复制标题
DOI：
10.3151/jact.19.26
复制
发表时间：
2021-01-01
影响因子：
2
通讯作者：
Kuang, Yanhua
中科院分区：
文献类型：
--
作者：
Zhang, Meng;Aba, Minoru;Kuang, Yanhua
在这项工作中，单独或混合添加不同剂量（0.1%，0.2%，0.3%，0.6%）的高吸水性聚合物（SAP）和石灰型膨胀剂（KEA）的长度和质量变化，抗压强度和孔结构（MIP）的砂浆的影响进行了研究。结果表明，掺高吸水性树脂（SAP）的砂浆在49 d内的长度变化值均小于基准值，而不考虑KEA的存在。与单独添加SAP相比，SAP和KEA的混合添加增加了试样的初始膨胀，这对于补偿砂浆在干燥条件下的收缩是有益的效果。此外，SAP的添加似乎延迟水泥水化并增加大孔（大于100 nm）的体积，从而降低砂浆的抗压强度。KEA的引入略微促进了微孔的形成，导致抗压强度与不含KEA的样品相比略有增加。此外，在我们看来，它促进毛孔细化，以减少水分蒸发。
In this work, the effects of the individual or hybrid addition of superabsorbent polymers (SAP) with varying dosages (0.1%, 0.2%, 0.3%, and 0.6%) and the lime-type expansive agent (KEA) on the length and mass change, compressive strength, and pore structures (MIP) of mortars were investigated. The results showed that the incorporation of SAP can effectively mitigate its autogenous shrinkage and the length change value of the mortar with SAP smaller than reference until 49 days, regardless of the presence of KEA. The hybrid addition of SAP and KEA increases the initial expansion of the specimens as compared with individual addition of SAP, which is a beneficial effect on compensating for the shrinkage of the mortar under drying conditions. Moreover, the addition of SAP seems to delay cement hydration and increase the volume of macropores (greater than 100 nm), thereby reducing the compressive strength of the mortars. The introduction of KEA slightly promoted the formation of micropores, resulting in a slight increase in compressive strength compared with the samples without KEA. Furthermore, in our view, it promotes pore refinement, so as to reduce moisture evaporation.