为探究粉煤灰替代率和细集料类型对高强混凝土冲击压缩性能的影响，以粉煤灰替代水泥比例为0、10%、15%、20%、25%为胶凝材料，玄武岩机制砂和天然砂为细集料配制C80高强混凝土，利用分离式霍普金森杆对其开展冲击压缩试验，计算破碎体分形维数量化混凝土破碎特征，并借助扫描电镜（SEM）分析混凝土微观形貌。结果表明：机制砂混凝土（MSC）的峰值应力和韧性均高于天然砂混凝土（NSC）；随着粉煤灰替代率增加，混凝土峰值应变逐渐降低；当粉煤灰替代率10%时，混凝土的峰值应力和韧性均达到最高值，且破碎体分形维数最小、平均块径最大、综合表现的破碎特征最简单；与未掺粉煤灰组混凝土相比，粉煤灰替代率10%时混凝土的微观形貌致密，孔隙数量减少，整体密实度提升。
Abstract
In order to explore the influence of the replacement rate of fly ash and the type of fine aggregate on the impact compression performance of high-strength concrete, C80 high-strength concrete was prepared with the proportion of fly ash replacing cement as 0, 10%, 15%, 20% and 25% as cementitious materials, basalt manufactured sand and natural sand as fine aggregate, and the split Hopkinson pressure bar was used to carry out impact compression tests on it, and calculate the Fractal dimension of the broken body to quantify the crushing characteristics of concrete, And analyze the microstructure of concrete using scanning electron microscopy (SEM). The results show that the peak stress and toughness of manufactured sand concrete (MSC) are higher than those of natural sand concrete (NSC); As the replacement rate of fly ash increases, the peak strain of concrete gradually decreases; When the replacement rate of fly ash is 10%, the peak stress and toughness of concrete reach the highest value, and the Fractal dimension of the broken body is the smallest, the average block diameter is the largest, and the comprehensive broken characteristics are the simplest; Compared with the concrete without fly ash, when the fly ash substitution rate is 10%, the microstructure of the concrete is dense, the number of pores is reduced, and the overall compactness is improved.
关键词
粉煤灰 /
玄武岩机制砂 /
高强混凝土 /
分离式霍普金森压杆 /
冲击压缩 /
分形维数
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Key words
fly ash /
Basalt manufactured sand /
high-strength concrete /
split Hopkinson pressure bar /
impact compression；fractal dimension
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