火山石/火山灰次轻掺料混凝土性能正交试验研究

Orthogonal Experimental Study on Volcanic Stone and Pozzolan Specified Density Admixture Concrete

摘要: 以云南腾冲火山石和火山灰为原材料，基于正交试验研究了火山石掺量、火山灰掺量和水胶比对次轻掺料混凝土的影响，并通过扫描电子显微镜(SEM)进行了微观表征分析。结果表明：火山石掺量在15%以下时混凝土28 d抗压强度和软化系数下降幅度较小；火山灰最佳掺量介于20%到30%之间；当因素水平组合为：火山石掺量5% + 火山灰掺量20% + 水胶比0.45时，所得的混凝土综合性能最佳；在微观层面最佳试验组混凝土比普通混凝土水化产物数量更多，形状更大，分布更紧密，彼此交错，形成了复杂稳定的三维结构。

Abstract: Using volcanic stone and pozzolan from Tengchong, Yunnan as materials, the effects of volcanic stone content, pozzolan content and water-binder ratio on specified density admixture concrete were studied based on orthogonal experiments, and the microstructures were analyzed by scanning electron microscope (SEM). The results show that when the content of volcanic stone is below 15%, the 28 d compressive strength and softening coefficient of the specified density admixture concrete decrease slightly; the optimal content of pozzolan is between 20% and 30%; when the factor level combination is: volcanic stone content (5%) + pozzolan content (20%) + water-binder ratio (0.45), compared with other test groups, the obtained concrete has the best overall performance; at the microscopic level, the concrete hydration products of the optimal experimental group are more numerous, larger in shape, more closely distributed than those of ordinary concrete, interlaced with each other, forming a complex and stable three-dimensional structure.