混杂纤维对活性粉末混凝土高温后抗压强度的影响

对混杂纤维活性粉末混凝土(RPC)不同温度等级作用并烧透(试件中心内置热电偶达到目标温度)后抗压强度进行了测试,研究了钢纤维和聚丙烯掺量对RPC抗压强度的影响.结果表明,RPC混凝土的抗压强度随着作用温度的升高总体呈下降趋势,钢纤维可以有效提高RPC混凝土抗压强度,而聚丙烯纤维可以改善RPC高温后性能和抑制爆裂,混杂纤维可优势互补.基于实验结果,给出了在钢纤维体积掺量2％,同时混掺聚丙烯体积掺量0、0.1％和0.2％下的RPC平均抗压强度与受火温度的关系式.

Hybrid Fiber on the Influence of the Reactive Powder Concrete Compressive Strength after High Temperature

Hybrid fiber reactive powder concrete (RPC) for different temperature levels and burn through built-in thermocouple (specimens center reach the target temperature) of compressive strength were tested, dosage of fiber and polypropylene to the influence of the compressive strength of RPC was studied.The results show that the compressive strength of RPC concrete as the rise of temperature is in general on the decline,steel fiber can improve the concrete compressive strength of RPC, and polypropylene fiber can improve the RPC after high temperature performance and suppress blowout, hybrid fiber can be complementary advantages.Based on the experimental results ,suggest while the steel fiber volume content is 2％, mixed with polypropylene content volume and 0, 0.1％ and 0.2％, the relationship between the average compressive strength of RPC and the temperature of fire.