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甄景新1,2

（1. 天地科技股份有限公司，北京，100013；2. 中煤科工開采研究院有限公司，北京，100013）

摘  要：為了提高公路工程用纖維混凝土的綜合性能，降低施工成本，以不同品質的粉煤灰為研究對象，通過混凝土拌合物工作性能、力學性能、抗氯離子滲透性能以及抗凍性能試驗，探究了不同品質和摻量粉煤灰對纖維混凝土綜合性能的影響。結果表明：摻入5%~20%不同品質的粉煤灰后，纖維混凝土工作性能均得到了不同程度地改善；隨著粉煤灰摻量的增大，纖維混凝土抗壓強度先增大后減小，電通量逐漸減小，凍融循環200次后的質量損失率先減小后增大，相對動彈性模量先增大后減小；粉煤灰的摻入能夠有效提高纖維混凝土的力學性能、抗氯離子滲透性能和抗凍性能，當粉煤灰的摻量為15%時，纖維混凝土的力學性能和抗凍性能達到最佳；I級粉煤灰對纖維混凝土綜合性能的改善效果略優于II級粉煤灰，但綜合考慮施工質量及成本等因素，可以考慮采用II級粉煤灰代替I級粉煤灰。

關鍵詞：粉煤灰；纖維混凝土；工作性能；力學性能；抗凍性能

中圖分類號：TU528          

文獻標志碼：A      

文章編號：1005-8249（2024）02-0022-05

DOI：10.19860/j.cnki.issn1005-8249.2024.02.005

 

ZHEN Jingxin

（1. Tiandi Technology Co., Ltd., Beijing, 100013, China;

2. Middling Coal Mining Research Institute Co.,Ltd.,Beijing 100013,China）

Abstract：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 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 specimens 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 GradeI fly ash on the comprehensive performance of fiber reinforced concrete is slightly better than that of GradeII 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.

Keywords：fly ash; fiber reinforced concrete; working performance; mechanical properties; frost 

作者簡介：甄景新（1981—），男，本科，高級工程師，研究方向：工業及民用建筑結構設計。

收稿日期：2023-08-27