动力试验模型用微粒混凝土的初步试验研究

在微粒混凝土中添加陶粒、粉煤灰、浮石等不同的骨料，养护7d和28d后对其进行弹性模量的测试，对无添加骨料和添加不同骨料的微粒混凝土的弹性模量进行了对比分析．对同一种添加骨料不同含量的微粒混凝土的弹性模量进行了对比分析，发现随添加骨料含量的增加，其弹性模量近似呈一定规律降低，其中浮石效果最好．对未添加骨料微粒混凝土，含水量的增加可有效降低其弹性模量．此外还对微粒混凝土28ci和7d弹性模量比值进行了统计分析，对有添加骨料微粒混凝土，其比值可近似取1．5，对无添加骨料微粒混凝土，其值可近似取1．7．从微粒混凝土最后破坏裂缝来看，裂缝以斜裂缝的剪切破坏为主，未发现骨料裂缝．

Experimental research on mircroconcrete used in dynamic test model

Some additional materials such as ceramsite, powder coal ash, or pumice were placed in microconcrete, the Young's modules of microconcretes, that were maintained for 7 days and for 28 days, were measured and compared. After the Young's modules of microconcrete with various amount for one additional material were analysed, it concluded that it would reduce approximately as a certain law when the amount of additional material increased, especially pumice. To the mincoconcrete without additional material, the water increase is helpful to reduce the Young's Modulus of it. The ratio value of the Young's module of mircoconcrete maintained for 28 days and that maintained for 7 days was statistically analysed: the ratio value is 1.5 to the mincroconcrete with additional materials, 1.7 to that without additional materials. The damage crack of mircoconcrete was researched. It mainly occurs by inclined cracks, and no adhibition crack can be found.