玻璃纤维配比优化的再生混凝土改性试验及性能测试

Modified study and performance test of recycled concrete with optimized glass fiber ratio

针对再生混凝土强度和耐久性不足的问题,提出通过玻璃纤维对再生混凝土进行改性。试验对玻璃纤维长度和掺量进行优化,并对优化后再生混凝土的性能进行研究。试验结果表明,玻璃纤维长度为8 mm,掺量为0.4%时,再生混凝土的强度和耐久性最佳。此时,再生混凝土28 d抗压强度和劈裂抗拉强度分别为41.6、3.6 MPa,经过150次氯盐-干湿循环后,抗压强度和劈裂抗拉强度分别为40.5、3.1 MPa,抗氯离子渗透电通量降低至3600 C·m^(2)/s左右,满足JTG 3420—2020规程要求。以上试验证明了玻璃纤维对改善再生混凝土的强度和耐久性均产生积极的影响,可为再生混凝土的后续应用提供参考。

To address the issue of insufficient strength and durability of recycled concrete,it was proposed to modify recycled concrete through glass fiber.The length and content of glass fiber were optimized,and the properties of the optimized recycled concrete were studied.The experimental results showed that when the length of glass fiber was 8mm and the dosage was 0.4%,the strength and durability of recycled concrete were the best.At this point,the compressive strength and splitting tensile strength of recycled concrete at 28 days were 41.6 MPa and 3.6 MPa,respectively.After 150 chloride salt dry wet cycles,the compressive strength and splitting tensile strength were 40.5 MPa and 3.1 MPa,respectively.The resistance to chloride ion penetration electrical flux reduced to around 3600 C·m^(2)/s,meeting the requirements of JTG 3420—2020 regulations.The above experiments have proven that glass fiber has a positive impact on improving the strength and durability of recycled concrete,and can provide reference for the subsequent application of recycled concrete.