养护时间对胶结砂相似材料抗压性能的影响

发布时间：2018-07-05 14:54

本文选题：相似材料 + 胶结砂　；参考：《振动与冲击》2015年13期

【摘要】：为研究相似材料的合理养护时间、缩短物理相似模型试验周期、加快模型试验进度,对4种不同配比的胶结砂相似材料试件实施3种养护时间下的静态单轴压缩试验,并采用分离式Hopkinson压杆装置进行相应养护时间下的单轴冲击压缩试验。研究表明,随着相似材料中胶结材料水化反应的进行,4种配比胶结砂相似材料的静、动态单轴抗压强度和纵波波速均随养护时间的延长而增加;且7 d到14 d增长速率较快,14 d到21 d增长速率较慢,合理的模型材料养护时间为14 d。在本次试验应变率条件下,胶结砂相似材料抗压强度动态增长因子和动态峰值应变随养护时间的延长而逐渐降低。砂灰比越小,相似材料中胶结材料越多,其静、动态单轴抗压强度越高,其抗压强度动态增长因子越小。
[Abstract]:In order to study the reasonable curing time of similar materials, shorten the period of physical similarity model test and accelerate the progress of model test, the static uniaxial compression tests were carried out on the specimens of four kinds of cemented sand similar materials with different proportions under three curing times. The split Hopkinson pressure bar device was used to carry out the uniaxial impact compression test under the corresponding curing time. The results show that the dynamic uniaxial compressive strength and longitudinal wave velocity increase with the prolongation of curing time with the hydration reaction of cementing materials in the similar materials. The growth rate of 7 days to 14 days is faster than that of 14 days to 21 days, and the reasonable curing time of the model materials is 14 days. Under the strain rate condition, the dynamic growth factor of compressive strength and dynamic peak strain of cemented sand similar materials decrease with the increase of curing time. The smaller the ratio of sand to cement, the more cemented materials in similar materials, the higher the static and dynamic uniaxial compressive strength, the smaller the dynamic growth factor of compressive strength.
【作者单位】：安徽理工大学矿山地下工程教育部工程研究中心;安徽理工大学土木建筑学院;
【基金】：国家自然科学基金(51174004)
【分类号】：TU521.1

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