主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2021, Vol. 40 ›› Issue (6): 805-808.

• • 上一篇    下一篇

橡胶粉对C60 HPC高温后力学性能的影响

樊祺，杜红秀，成聪慧，宋佳佳   

  1. 太原理工大学土木工程学院，山西太原030024
  • 出版日期:2021-06-15 发布日期:2021-06-15
  • 通讯作者: 杜红秀，太原理工大学土木工程学院博士，教授，博导。
  • 作者简介:：樊祺（1996-），男，太原理工大学土木工程学院硕士研究生，主要从事建筑材料防火研究，山西省太原市万柏林区迎泽西大街79 号，030024。
  • 基金资助:
    山西省重点研发计划项目（201903D21113）

Effect of rubber powder on the fracture properties of C60 HPC after high temperature

FAN Qi，DU Hong-xiu，CHENG Cong-hui， SONG Jia-jia   

  1. College of Civil Engineering, Taiyuan University of Technology, Shanxi Taiyuan 030024, China
  • Online:2021-06-15 Published:2021-06-15

摘要： 为研究橡胶粉对C60 高性能混凝土高温后断裂性能的影响，对橡胶粉掺量为5%和8%的C60 HPC 进行高温试验，测定不同高温后试件的抗压强度及劈裂抗拉强度，并基于双K 断裂理论对试件进行三点弯曲断裂试验，计算断裂参数，绘制起裂韧度、失稳韧度随温度的变化曲线。结果表明，随着温度上升，C60HPC 抗压强度和劈裂抗拉强度呈下降趋势，掺加橡胶粉会降低C60 HPC 的力学性能。400 ℃内C60 HPC 的起裂韧度和失稳韧度降幅为8.7%和12.2%，400~600 ℃时，起裂韧度和失稳韧度降幅均超过50%。拟合结果表明，掺加橡胶粉C60 HPC 的起裂韧度和失稳韧度损失阈值分别为400 ℃和500 ℃。

关键词: 高性能混凝土, 高温, 橡胶粉, 力学性能, 断裂参数

Abstract: In order to study the effect of rubber powder on the fracture performance of C60 high performance concrete after high temperature, high temperature tests were carried out on C60 HPC with rubber powder content of 5% and 8% to determine the compressive strength and splitting tensile strength, and based on the double- K fracture theory, a three- point bending fracture test was performed on the specimen, the fracture parameters were calculated, and the initiation toughness and instability toughness were plotted against temperature. The results show that as the temperature increases, the compressive strength and splitting tensile strength of C60 HPC show a downward trend, and the addition of rubber powder will reduce the mechanical properties of C60 HPC. The initiation toughness and instability toughness of C60 HPC mixed with rubber powder at 400 ℃ decreased by 8.7% and 12.2%. At 400~600 ℃, the initiation toughness and instability toughness decreased by more than 50%. Analysis and fit curve shows that the thresholds for the initiation toughness and instability toughness loss of C60 HPC blended with rubber powder are 400 °C and 500 °C separately.

Key words: high performance concrete, high temperature, rubber powder, mechanical properties, fracture parameters