高岭土-聚丙烯酸钠高吸水性树脂对砂浆性能影响研究摘要高吸水性树脂((SAP)是一种最新的混凝土内养护剂，能够降低混凝土开裂的风险。目前国内外对 SAP 的研究不多，主要还是停留在对其本身结构的分析。本课题提出了无机-有机复合内养护剂的想法，将无机材料高岭土复合到 SAP 中，以探究无机材料是否能影响 SAP 的工作性能。本文针对添加 SAP 的水泥砂浆的性能变化规律展开详细研究。首先通过针对 SAP 的性能试验可以得出，高岭土含量越高，SAP 的吸水性能越强，但最终达到的吸水平衡点越低，并且吸水与失水的速率也越来越慢。其次，在固定粒径下，通过多掺量和不同高岭土含量的组合，对影响水泥砂浆性能的因素进行了全面的分析和探讨。干燥收缩试验结果表明，掺量和 SAP 含量的不同，对混凝土的干燥收缩具有明显的影响。在同等条件下，高岭土的含量对干燥收缩影响的显著性更大。力学性能试验结果表明：SAP 的类型、掺量均会影响砂浆中的自由水量和孔洞数量，进而影响砂浆的力学性能，SAP 中高岭土含量越多、掺量越大，对力学性能的影响就越大。SAP 对砂浆力学性能的不利影响主要体现在水化早期。同时通过比较得出，SAP 对早期抗折强度的不利影响大于对早期抗压强度的影响。关键词:高吸水性树脂；高岭土；砂浆；干燥收缩；力学性能PAGE \* MERGEFORMATIAbstractSuper Absorbent Polymer (SAP) is a new curing agent for concrete, which can reduce the risk of concrete cracking. At present, there are few studies on SAP both at home and abroad, mainly focusing on the analysis of its own structure. In this paper, the idea of inorganic-organic composite internal curing agent was put forward. Inorganic material kaolin was compounded into SAP to explore whether inorganic material could affect the performance of SAP. In this paper, the performance of cement mortar with SAP is studied in detail. Firstly, through the performance test of SAP, it can be concluded that the higher the kaolin content, the stronger the water absorption performance of SAP, but the lower the final equilibrium point of water absorption, and the slower the rate...
