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目的研究温度对聚丙烯纤维砂浆及测强曲线的影响,为以后工程防火加固选用砂胶比提供依据,从而达到降低成本的目的.方法通过测试不同胶砂质量比的聚丙烯纤维砂浆的初始流动度、终凝时间、抗压强度和抗折强度,研究不同温度下不同碳纤维掺量的聚丙烯纤维砂浆的耐高温性能.结果当碳纤维体积分数为0.3%、胶砂质量比为1.5时,聚丙烯纤维砂浆流动度大于320 mm,终凝时间60 min左右,28 d抗压强度大于80 MPa,1 000℃高温燃烧后,残余50%以上强度,各龄期的测强曲线与实测强度有较好的拟合关系.结论采用普通硅酸盐水泥、铝酸盐水泥、石膏三元体系,通过添加碳纤维、偏高岭土掺合料及多种化学添加剂,可满足工程实际需要,并且具有良好的经济性.
Aim To study the effect of temperature on the strength of polypropylene fiber mortar and its strength curve and to provide a basis for the selection of sand and mortar ratio for fireproofing and reinforcement in future projects so as to reduce the cost.Methods The initial flow of polypropylene fiber mortar Temperature, final setting time, compressive strength and flexural strength of polypropylene mortar with different carbon fiber contents at different temperatures were investigated.Results When the carbon fiber volume fraction was 0.3% and the mortar mass ratio was 1.5, Propylene fiber mortar fluidity greater than 320 mm, the final setting time of 60 min, 28 d compressive strength greater than 80 MPa, 1 000 ℃ high temperature combustion, the residual strength of more than 50%, the measured strength curve of each age and the measured intensity Good fitting relationship.Conclusion The common portland cement, aluminate cement, gypsum ternary system, through the addition of carbon fiber, metakaolin admixture and a variety of chemical additives to meet the actual needs of the project, and has good economy .