本文選題：珊瑚砂　切入點(diǎn)：微生物固化　出處：《工業(yè)建筑》2016年12期

【摘要】：對(duì)不同含水率及干密度增量的珊瑚砂微生物固化體進(jìn)行了無側(cè)限抗壓強(qiáng)度試驗(yàn)和電鏡掃描試驗(yàn),研究含水率對(duì)不同干密度增量固化體的應(yīng)力-應(yīng)變曲線特征、無側(cè)限抗壓強(qiáng)度、彈性模量和微觀結(jié)構(gòu)的影響。結(jié)果表明:不同含水率的固化體受壓后呈脆性破壞,應(yīng)力-應(yīng)變曲線形態(tài)類似,均為應(yīng)變軟化型,破壞應(yīng)變隨含水率的增高而減小。固化體的無側(cè)限抗壓強(qiáng)度隨含水率的增高而減小,含水率從0%增高到15%后固化體強(qiáng)度的減小幅度最高達(dá)33.5%,且干密度增量越大,強(qiáng)度的減小幅度越大;彈性模量隨含水率的增高呈現(xiàn)先增大后減小的趨勢(shì)。珊瑚砂顆粒破碎與碳酸鈣膠結(jié)被水弱化均會(huì)降低固化體的強(qiáng)度和彈性模量,不同含水率和干密度增量對(duì)結(jié)構(gòu)的強(qiáng)度特性產(chǎn)生了不同的影響,并綜合影響了固化體的力學(xué)特性。不同含水率的固化體受壓破壞后的微觀結(jié)構(gòu)具有差異,含水率為0%的固化體顆粒破碎現(xiàn)象較為明顯,含水率為15%的固化體碳酸鈣膠結(jié)的斷裂和剝落更嚴(yán)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.
【作者單位】： 后勤工程學(xué)院土木工程系;重慶科技學(xué)院建筑工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51479208;11272354) 總后勤部基建營(yíng)房部資助項(xiàng)目(CY114C022)
【分類號(hào)】：TU411

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