基于声发射的蒸养混凝土受压损伤特性试验研究

为研究矿物掺合料对蒸养混凝土抗压性能的影响，对不同养护制度和配合比混凝土进行了单轴压缩声发射试验，利用声发射信号参数和高斯混合模型探究混凝土的损伤演化特性。试验结果表明：蒸养混凝土抗压强度普遍低于标养混凝土，矿物掺合料的加入能够补偿蒸汽养护导致的强度损失，且复掺粉煤灰和矿粉的补偿效果更好；受压全程中张拉破坏始终占据主导，而剪切破坏占比随加载时间呈递增趋势；声发射参数中，累计振铃计数、b值变化幅度和剪切破坏形式占比均与抗压强度呈负相关关系，可作为评价混凝土抗压性能的重要参数。

Experimental study on compressive damage characteristics of steam-cured concrete based on acoustic emission

In order to study the effect of mineral admixtures on the compressive properties of steam-cured concrete, the acoustic emission test under uniaxial compression was carried out for concrete with different curing regimes and mix ratios, and the damage evolution characteristics of concrete were explored by using acoustic emission signal parameters and Gaussian mixture model. The research shows that the compressive strength of steam-cured concrete is generally lower than that of standard-cured concrete. The addition of mineral admixtures can compensate for the strength loss caused by steam curing, and the compensation effect of adding fly ash and mineral powder is the best. The tension failure always dominates the whole compression process, while the shear failure proportion increases with the loading time. Among the acoustic emission parameters, the accumulative ringing count, the change range of b value and the proportion of shear failure forms are all negatively correlated with the compressive strength value, which can be used as important parameters to evaluate the compressive performance of concretes.