首页|高温后冷却方式对玄武岩纤维混凝土力学性能的影响

高温后冷却方式对玄武岩纤维混凝土力学性能的影响

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
高温处理后混凝土力学性能是工程建设中评价混凝土结构安全性能的重要指标之一。对不同玄武岩纤维(BF)掺量混凝土的力学性能进行了测试，将最优掺量的玄武岩纤维混凝土(BFRC)与普通混凝土(OC)进行高温处理(200、400、600、800℃)，研究不同冷却方式(自然冷却和喷水冷却)对高温后BFRC性能劣化的影响，分析BFRC在不同温度和冷却方式下的力学性能变化规律。结果表明，当BF掺量为0。05％(体积分数)时，BFRC抗压强度、劈裂抗拉强度达到最大值，分别为50。2、3。5 MPa，较OC分别提高了 14。87％、34。62％。BF的掺入能够有效增加混凝土的韧性以及抵抗开裂变形的能力。随着温度增加，BFRC试件的弹性模量减小但始终大于OC试件。同一冷却方式下OC的峰值应变均大于BFRC，不同冷却方式下的延性指数较常温均有所提高。
Effect of Cooling Method after High Temperature on Mechanical Properties of Basalt Fiber Reinforced Concrete
The mechanical property of concrete after high temperature treatment is one of the important indexes to evaluate the safety performance of concrete structure in engineering construction.The mechanical properties of concrete with different basalt fiber(BF)content were tested.The optimal basalt fiber reinforced concrete(BFRC)and ordinary concrete(OC)were subjected to high temperature treatment(200,400,600,800 ℃).The effects of different cooling methods(natural cooling and spray cooling)on the performance degradation of BFRC after high temperature were studied,and the mechanical properties of BFRC under different temperatures and cooling methods were analyzed.The results show that when the content of BF is 0.05％(volume fraction),the compressive strength and splitting tensile strength of BFRC reach the maximum values of 50.2 and 3.5 MPa,which are 14.87％and 34.62％higher than those of OC,respectively.The incorporation of BF can effectively increase the toughness of concrete and the ability to resist cracking.With the increase of temperature,the elastic modulus of BFRC specimen decreases,but the elastic modulus of BFRC specimen is always greater than that of OC specimen.The peak strain of OC is greater than that of BFRC under the same cooling method,and the ductility index under different cooling methods is higher than that under normal temperature.

concretehigh temperature coolingbasalt fibermechanical propertyelastic modulusductility indextoughness

庞建勇、郑瑞琪、胡秀月、孙健、徐国平、苏永强

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安徽理工大学土木建筑学院,淮南 232001

混凝土 高温冷却 玄武岩纤维 力学性能 弹性模量 延性指数 韧性

煤炭资源与安全开采国家重点实验室基金矿山建设工程安徽省高校重点实验室开放基金安徽省高校自然科学研究项目安徽理工大学研究生创新基金

SKLCRSM23KF007GXZDSYS20221062023AH0512192022CX2038

2024

硅酸盐通报
中国硅酸盐学会 中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心
影响因子：0.698
ISSN：1001-1625
年,卷(期)：2024.43(1)
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