粉煤灰品质和掺量对公路工程用纤维混凝土综合性能的影响  

Effect of Fly Ash Quality and Dosage on the Comprehensive Performance of Fiber Reinforced Concrete for Highway Engineering

作　　者：甄景新 ZHEN Jingxin(Tiandi Technology Co.,Ltd,Beijing 100013,China;Middling Coal Mining Research Institute Co.,Ltd,Beijing 100013,China)

机构地区：[1]天地科技股份有限公司,北京100013 [2]中煤科工开采研究院有限公司,北京100013

出　　处：《粉煤灰综合利用》2024年第2期22-26,共5页Fly Ash Comprehensive Utilization

摘　　要：为了提高公路工程用纤维混凝土的综合性能,降低施工成本,以不同品质的粉煤灰为研究对象,通过混凝土拌合物工作性能、力学性能、抗氯离子渗透性能以及抗冻性能试验,探究了不同品质和掺量粉煤灰对纤维混凝土综合性能的影响。结果表明:掺入5%~20%不同品质的粉煤灰后,纤维混凝土工作性能均得到了不同程度地改善;随着粉煤灰掺量的增大,纤维混凝土抗压强度先增大后减小,电通量逐渐减小,冻融循环200次后的质量损失率先减小后增大,相对动弹性模量先增大后减小;粉煤灰的掺入能够有效提高纤维混凝土的力学性能、抗氯离子渗透性能和抗冻性能,当粉煤灰掺量为15%时,纤维混凝土的力学性能和抗冻性能达到最佳;Ⅰ级粉煤灰对纤维混凝土综合性能的改善效果略优于Ⅱ级粉煤灰,但综合考虑施工质量及成本等因素,可以考虑采用Ⅱ级粉煤灰代替Ⅰ级粉煤灰。In order to improve the comprehensive performance of fiber reinforced concrete for highway engineering and reduce the construction cost,the effects of different quality and amount of fly ash on the comprehensive performance of fiber reinforced concrete were studied by testing the working performance,mechanical properties,chloride penetration resistance and frost resistance of the concrete mix.The results show that the working performance of fiber reinforced concrete is improved by adding 5%~20% fly ash of different quality.With the increase of fly ash content,the compressive strength of fiber reinforced concrete first increases and then decreases,the electric flux gradually decreases,the mass loss after 200 freeze-thaw cycles first decreases and then increases,and the relative dynamic elastic modulus first increases and then decreases.The addition of fly ash can effectively improve the mechanical properties,chloride ion penetration resistance and freeze resistance of fiber reinforced concrete.When the fly ash content is 15%,the mechanical properties and freeze resistance of fiber reinforced concrete reach the best.The improvement effect of Grade Ⅰ fly ash on the comprehensive performance of fiber reinforced concrete is slightly better than that of grade Ⅱ fly ash,but considering the factors such as construction quality and cost,we can consider using grade Ⅱ fly ash instead of grade Ⅰ fly ash.

关 键 词：粉煤灰 纤维混凝土 工作性能 力学性能 抗冻性能 

分 类 号：TU528[建筑科学—建筑技术科学]