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许   昊 ，王晓磊 ， 刘历波

（ 河北工程大学 土木工程学院 ，河北 邯郸 056038)

摘   要 ：为了研究高温损伤后不同掺量玄武岩纤维混凝土的孔隙结构和力学性能的变化规律 ， 以及高温后 孔隙结构对宏观力学性能的影响 。对不同体积掺量  (0. 5% 、1% 、1 . 5%)   的玄武岩纤维混凝土进行 200 ~ 800 ℃ 高温处理 ，运用饱和水法测量其在不同高温后的孔隙率 ，并对不同高温后的玄武岩纤维混凝土试块进行抗压强 度试验 。结果表明 ：随着温度的升高 ，玄武岩纤维混凝土的孔隙率不断增大 ，200 ℃ 高温作用后孔隙率增长缓 慢 ，超过400 ℃ 高温作用后孔隙率则迅速增大 ；抗压强度先增大后降低 ，经过 200 ℃ 高温作用后抗压强度达到峰 值 ，经过 800 ℃ 高温作用后抗压强度急剧下降。

关键词 ：混凝土 ；玄武岩纤维 ；高温损伤 ；孔隙结构

中图分类号 ：TU541           

文献标志码 ：A            

       文章编号 ：1005- 8249  (2024)   01- 0077- 06

DOI : 10. 19860/j . cnki . issn1005- 8249. 2024. 01 . 014

 

XU Hao ,  WANG Xiaolei ,  LIU Libo

( College of Civil Engineering Hebei University of Engineering ,   Handan 056038 ,   China)

Abstract :So as to check the pore structure and mechanical properties of volcanic rock fiber concrete when extreme temperature injury, and therefore the influence of pore structure on large mechanical properties when extreme temperature. during this paper, volcanic rock fiber concrete with totally different volume content ( 0%, 0.5 %, 1 %, 1.5% ) was treated at 200-800℃. At the same time , saturated water methodology was accustomed live the porosity when totally different high temperatures, and therefore the compressive strength of volcanic rock fiber concrete blocks when totally different high temperatures was tested. The results show that the porosity of volcanic rock fiber concrete will increase with the rise of temperature. The porosity will increase slowly when 200℃ extreme temperature, and will increase quickly when 400℃ extreme temperature. The compressive strength initial enhanced then diminished. when 200℃ extreme temperature, the compressive strength reached the height, and when 800℃ extreme temperature, the compressive strength diminished sharply.

Keywords :  concrete ;   basalt fiber;   high temperature damage ;  pore structure

 

作者简介 ：许昊  ( 1995—) ,   男 ，硕士研究生 ，主要研究方向 ：结构工程。

通信作者 ：王晓磊  ( 1983—) ,   男 ，博士 ，教授 ， 主要研究方向 ：新型建筑材料。

收稿日期 ：2023- 1 - 10