摘  要：通过对不同煤矸石陶粒掺量（0、20%、40%、60%）的混凝土进行快速冻融循环试验，探究了冻融循环后煤矸石陶粒混凝土的表面劣化、质量损失率和相对动弹性模量的变化规律，以不同冻融循环次数下煤矸石陶粒混凝土的动弹性模量为损伤变量，建立了煤矸石陶粒混凝土冻融损伤劣化模型，并对其在自然冻融环境下的寿命进行了预测。研究结果表明，随着冻融循环次数的增加，煤矸石陶粒混凝土的抗冻性能逐渐降低，但降低幅度有所不同；随着煤矸石陶粒取代率的增加，混凝土的抗冻性能呈现先下降后提高再下降的趋势；建立的煤矸石陶粒混凝土冻融损伤劣化模型与试验结果符合较好，具有较高的精度；当煤矸石陶粒掺量为40%时，混凝土的抗冻性能效果最佳，抗冻耐久性寿命最长。
Abstract: The rapid freeze-thaw cycling tests of concrete blocks with different content of coal gangue ceramsite (0, 20%, 40%, 60%) were carried out to study the variation regularities of surface deterioration, mass loss rate and relative dynamic elastic modulus of coal gangue ceramsite concrete after freeze-thaw cycling, and the dynamic elastic modulus of coal gangue ceramsite concrete with different freeze-thaw cycles was used as the damage variable and the freeze-thaw damage deterioration model of coal gangue ceramsite concrete was established and its life under natural freeze-thaw environment was predicted. The results show that with the increase of freeze-thaw cycles, the frost-resistance of coal gangue ceramsite concrete decreases gradually, but the decreasing range is different. With the increase of the replacement rate of coal gangue ceramsite, the frost-resistance of concrete decreases first, then increases and then decreases. The freeze-thaw damage deterioration model of coal gangue ceramsite concrete is in good agreement with the experimental results and has high accuracy. When the content of coal gangue ceramsite is 40%, the frost-resistance of concrete is the best, and the life of frost-resistance is the longest.