高吸水树脂对水泥性能的影响

The effects of SAP on cement

以N，N-亚甲基双丙烯酰胺为交联剂，过硫酸钾为引发剂，采用溶液聚合法合成了丙烯酸。丙烯酰胺二元共聚高吸水性树脂及AMPS-AA-AM三元共聚高吸水性树脂。研究了单体组成、单体浓度、引发剂用量、交联剂用量、反应温度等因素对产物性能的影响。以自制的高分子吸水树脂（SAP）作为水泥基材料自养护外加剂，利用吸水树脂优良的保水性能，为水泥水化提供较长时间及持续、稳定的水分供应和充分的内部相对湿度，保证水化反应的顺利进行，达到自养护的目的。考察了影响吸水树脂吸水性能的因素以及掺加吸水树脂的水泥试样的强度、流动度等性能。

A super water-absorbent resin was synthesized from the sodium salt of acrylic acid with acrylamide as comonomer, N,N＇-methylenebisacrylamide as crosslinking agent, K2S2O8 as initator, by means of aqueous solution polymerization. The effects of AM content, total monomer concentration, initiator concentration, crosslinker content, bath temperature on the characteristics of products as well as the reaction kinetics and the swelling kinetics of products were investigated. Superabsorbent polymers （SAP） were prepared and used as a novel self-curing admixture in cement-based materials. SAP has good capability of absorbing and retaining water. It can rest-rain the desiccation in the early age of the cement hydration, and can offer sufficient moisture to keep the internal relative humidity in system in a rather long period of time. So the reaction of hydration is improved and the self-curing process thus realized. The effects of water absorbency on SAP and the effects of SAP on the fluidity, strength properties of cement-based materials were discussed.