冷却方式对高温后RPC力学性能和超声波速的影响  

Effect of cooling method on the mechanical properties and ultrasonic velocity of RPC after high temperature

作　　者：孙磊[1] 杜红秀[1] SUN Lei;DU Hongxiu(Institute of Building Materials and Disaster Prevention,College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院建筑材料与防灾研究所,山西太原030024

出　　处：《混凝土》2022年第10期34-37,共4页Concrete

基　　金：国家自然科学基金资助(51478290);山西省重点研发计划项目(201903D321113)。

摘　　要：为探究冷却方式对混掺纤维RPC高温后强度损伤的影响,对混掺聚丙烯纤维和玄武岩纤维的RPC试件进行高温处理,研究其在自然冷却和喷水冷却两种方式下力学性能、超声波速与受火温度的关系,结果表明:随受火温度升高,RPC的抗压强度、抗折强度、超声波速呈下降趋势,平均孔径、孔隙率呈上升趋势;相同受火温度下,自然冷却后RPC抗压强度、抗折强度、超声波速均高于喷水冷却后的相应值,平均孔径和孔隙率有所降低;随着聚丙烯纤维掺量的增加,高温后RPC抗折强度呈上升趋势,抗压强度及超声波速呈下降趋势;玄武岩纤维可改善RPC力学性能。In order to explore the influence of cooling method on the strength damage of mixed fiber RPC after high temperature,high temperature treatment was performed on the RPC sample mixed with polypropylene fiber and basalt fiber,and the mechanical properties and ultrasonic wave were studied under natural cooling and water spray cooling.The results show that the compressive strength,flexural strength,and ultrasonic velocity of RPC show a downward trend as the fire temperature increases,while the average pore diameter and porosity show an upward trend.Under the same fire temperature,the natural after cooling,the RPC compressive strength,flexural strength,and ultrasonic velocity are all higher than the corresponding values after water spray cooling,and the average pore size and porosity are reduced.With the increase of polypropylene fiber content,the RPC flexural strength becomes ascending trend,compressive strength and ultrasonic velocity are descending.Basalt fiber can improve the mechanical properties of RPC.

关 键 词：活性粉末混凝土 混掺纤维 力学性能 超声检测 孔结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]