【摘要】 将未吸水的高吸水树脂(Super Absorbent Polymer, SAP)材料按胶凝材料质量的0.1%、0.2%、0.3%、0.4%、0.5%掺入混凝土中,测试了混凝土试块的抗压强度。试验结果表明适量的SAP的加入可以提升混凝土的强度,但是当SAP的掺入量过多时混凝土的强度不升反降。使用RapidAir457孔结构测定仪对28d龄期水胶比(W/C)为0.38的混凝土试块进行孔结构分析,混凝土的孔隙主要集中在0～500μm范围内,平均占总孔隙比例的97.17%,加入SAP使得混凝土材料中较小(<100μm)的孔洞占比减少,较大的(>100μm)的孔洞占比增加,平均孔径增加。压汞法试验结果表明SAP的加入使得混凝土内部孔隙率增加。更多还原

【Abstract】 The SAP material without water absorption is mixed into the concrete at 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% of the mass of the cementitious material, and the compressive strength of the concrete tested block is tested. The experimental results show that the addition of an appropriate amount of SAP can increase the strength of the concrete, but when the amount of SAP is too much, the strength of the concrete does not increase but decreases. The RapidAir457 pore structure tester is used to analyze the pore structure of the 28-day-age concrete block with a water-to-binder ratio of 0.38. The pores of the concrete are mainly concentrated in the range of 0-500μm, accounting for 97.17% of the total pore ratio on average. The addition of SAP reduces the proportion of smaller(<100μm) pores in the concrete material, increases the proportion of larger(>100μm) pores, and increases the average pore size. The test results of mercury intrusion method show that the addition of SAP increases the internal porosity of concrete.更多还原