早强型含水不饱和聚氨酯混凝土力学性能
Mechanical property of early-strength water-containing unsaturated polyurethane concrete

为解决普通聚氨酯混凝土和易性差、固化快与成型控制困难等问题,针对常见聚合物混凝土对骨料的高标准要求,提出了一种新型含水不饱和聚氨酯混凝土。应用配比试验、强度试验、掺水量试验、浸泡试验和现场取样试验,研究了含水不饱和聚氨酯混凝土的力学性能,分析了材料性质、材料配比、温度与掺水量等因素对其力学性能的影响。分析结果表明:当温度为10 ℃～20 ℃时,可加不饱和聚氨酯用量15%～20%的水,温度大于20 ℃时,可加不饱和聚氨酯用量20%～30%的水,现场工程应用和浸泡试验证明,这种含水不饱和聚氨酯混凝土1 d抗压强度为22.70 MPa,长期浸泡后未发现软化与崩解现象,因此,含水不饱和聚氨酯混凝土性能稳定,和易性好,成型控制容易,能够满足工程需要; 在15 ℃温度条件下,推荐的基本配比为水泥、沙子、石子、ZK3、水、不饱和聚氨酯、引发剂与促进剂的质量比为1.000:5.700:7.300:1.300:0.080:2.000:0.050:0.025。
To solve the problem of poor workability, fast curing and molding difficulty of common polyurethane concrete, a new water-containing unsaturated polyurethane concrete was proposed according to the requirement of high standards for aggregate in common polymer concrete. The mechanical properties of water-containing unsaturated polyurethane concrete were investigated by ratio test, strength test, water-mixed test, immersion test and field sampling test, and the effects of material properties, material ratio, temperature and moisture content on the mechanical properties were analyzed. Analysis result shows when the added amount of water is 15%-20% of unsaturated polyurethane at 10 ℃-20 ℃, the added amount of water is 20%-30% of unsaturated polyurethane above 20 ℃, the compressive strength of 1 d for the water-containing unsaturated polyurethane concrete is 22.70 MPa in field engineering application and immersion test, and the phenomena of softening and disintegration are not found after long-term immersion. Obviously, the water-containing unsaturated polyurethane concrete has good stability, workability and formability that meet the engineering needs in the construction. At 15 ℃, the recommended mass ratio of cement, sand, stone, ZK3, water, unsaturated polyurethane, initiator, and accelerant is 1.000:5.700:7.300:1.300:0.080:2.000:0.050:0.025. 8 tabs, 8 figs, 25 refs