含水率对珊瑚砂微生物固化体力学特性影响研究

发布时间：2018-03-27 20:47

本文选题：珊瑚砂　切入点：微生物固化　出处：《工业建筑》2016年12期

【摘要】：对不同含水率及干密度增量的珊瑚砂微生物固化体进行了无侧限抗压强度试验和电镜扫描试验,研究含水率对不同干密度增量固化体的应力-应变曲线特征、无侧限抗压强度、弹性模量和微观结构的影响。结果表明:不同含水率的固化体受压后呈脆性破坏,应力-应变曲线形态类似,均为应变软化型,破坏应变随含水率的增高而减小。固化体的无侧限抗压强度随含水率的增高而减小,含水率从0%增高到15%后固化体强度的减小幅度最高达33.5%,且干密度增量越大,强度的减小幅度越大;弹性模量随含水率的增高呈现先增大后减小的趋势。珊瑚砂颗粒破碎与碳酸钙胶结被水弱化均会降低固化体的强度和弹性模量,不同含水率和干密度增量对结构的强度特性产生了不同的影响,并综合影响了固化体的力学特性。不同含水率的固化体受压破坏后的微观结构具有差异,含水率为0%的固化体颗粒破碎现象较为明显,含水率为15%的固化体碳酸钙胶结的断裂和剥落更严重。
[Abstract]:The unconfined compressive strength test and scanning electron microscope test were carried out on the microorganism solidified body of coral sand with different moisture content and dry density increment. The stress-strain curve characteristics and unconfined compressive strength of different dry density incremental solidified bodies with water content were studied. The results show that the solidified bodies with different moisture content exhibit brittle failure and the stress-strain curves are similar in shape, all of them are strain-softening type. The failure strain decreases with the increase of moisture content, and the unconfined compressive strength decreases with the increase of moisture content. The maximum decrease of strength of solidified body is 33.5% after the increase of moisture content from 0% to 15%, and the increase of dry density is larger. With the increase of moisture content, the modulus of elasticity increases first and then decreases. The breaking of coral sand particles and the weakening of calcium carbonate cement coating will decrease the strength and elastic modulus of the solidified body. Different moisture content and dry density increment have different influence on the strength characteristics of the structure, and have a comprehensive influence on the mechanical properties of the solidified body. The microstructure of the solidified body with different moisture content is different after compression failure. The breakage of solidified particles with water content of 0% is obvious, and the fracture and spalling of Caco _ 3 cemented with 15% water content are more serious.
【作者单位】：后勤工程学院土木工程系;重庆科技学院建筑工程学院;
【基金】：国家自然科学基金项目(51479208;11272354) 总后勤部基建营房部资助项目(CY114C022)
【分类号】：TU411

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