Guo Yihong, Gao Jianlin, Lv Jianfu
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China.
Materials (Basel). 2024 Sep 19;17(18):4593. doi: 10.3390/ma17184593.
In this paper, the effect of basalt fiber (BF) on the frost resistance of concrete under different curing conditions was investigated, and its frost resistance mechanism was analyzed. Three different curing conditions (normal curing, short-term curing, and seawater curing) were adopted, and concrete with different BF volume contents was designed. Freeze-thaw (FT) tests were carried out using the rapid freezing method to test the frost resistance of basalt fiber reinforced concrete (BFRC). Additionally, the mass loss rate (MLR), relative dynamic modulus of elasticity (RDME) change, and compressive strength reduction of specimens during the freeze-thaw cycles (FTCs) were evaluated. The results show that when the BF content is 0.15%, under normal curing, short-term curing, and seawater curing conditions, the residual compressive strength of BFRC after FTCs was increased by 5.4%, 28.1%, and 30.9%, respectively, compared to plain concrete. By incorporating BF into concrete, the development of microcracks can be effectively retarded, and damage generation during FTCs can be reduced. In addition, the microscopic morphological characteristics and pore structure characteristics of concrete further elucidate the frost resistance mechanism of BFRC from a microscopic perspective.
本文研究了玄武岩纤维（BF）对不同养护条件下混凝土抗冻性的影响，并分析了其抗冻机理。采用了三种不同的养护条件（标准养护、短期养护和海水养护），设计了不同BF体积含量的混凝土。采用快速冻融法进行冻融（FT）试验，以测试玄武岩纤维增强混凝土（BFRC）的抗冻性。此外，还评估了冻融循环（FTCs）过程中试件的质量损失率（MLR）、相对动弹模量（RDME）变化和抗压强度降低情况。结果表明，当BF含量为0.15%时，在标准养护、短期养护和海水养护条件下，与普通混凝土相比，BFRC在FTCs后的残余抗压强度分别提高了5.4%、28.1%和30.9%。通过在混凝土中掺入BF，可以有效延缓微裂纹的发展，并减少FTCs过程中的损伤产生。此外，混凝土的微观形态特征和孔结构特征从微观角度进一步阐明了BFRC的抗冻机理。
