發(fā)布時(shí)間：2018-05-13 19:12

  本文選題：水泥土 + 納米CaO��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：水泥土由于其所具有的施工方便、對(duì)周圍環(huán)境影響較小、價(jià)格低廉和加固效果顯著等特點(diǎn)被廣泛應(yīng)用于各類軟土加固工程中。水泥土是一種人工改良軟土的材料，將需要處理的軟土經(jīng)過與水泥攪拌而形成的水泥土具有整體性、低壓縮性、水穩(wěn)定性。但后期經(jīng)過驗(yàn)證發(fā)現(xiàn)水泥土由于強(qiáng)度不高、變形較大在很多應(yīng)用上也會(huì)受到限制。 論文根據(jù)納米材料所具有的優(yōu)異性能，將納米CaO摻入到水泥土中，通過正交設(shè)計(jì)試驗(yàn)和全面試驗(yàn)，分析納米CaO水泥土在不同水泥摻入比與不同納米CaO摻入比的條件下，水泥土的無側(cè)限抗壓強(qiáng)度變化規(guī)律；將納米CaO水泥土進(jìn)行不同養(yǎng)護(hù)齡期后通過聲波測(cè)速試驗(yàn)觀察其波速的變化情況而比較水泥土的強(qiáng)度改變；分析了納米CaO水泥土的應(yīng)力-應(yīng)變關(guān)系特征和強(qiáng)度增長規(guī)律，并采用了純水泥土與納米CaO水泥土的電鏡照片，分析了的微觀結(jié)構(gòu)特征和結(jié)構(gòu)的變化。研究認(rèn)為： （1）在正交設(shè)計(jì)試驗(yàn)中發(fā)現(xiàn)水泥摻量為20%，納米CaO摻入比為10‰，水灰比0.35時(shí)水泥土的無側(cè)限抗壓強(qiáng)度最高，這個(gè)組合為正交設(shè)計(jì)中的最佳配比。 （2）通過全面試驗(yàn)中在四個(gè)水泥摻入比中當(dāng)納米CaO含量為10‰時(shí)在同一養(yǎng)護(hù)齡期時(shí)無側(cè)限抗壓強(qiáng)度最高，也驗(yàn)證了正交試驗(yàn)設(shè)計(jì)結(jié)果的可靠性。 （3）通過掃描電鏡能夠看到水泥土與納米CaO水泥土相對(duì)原狀土大孔隙減小，結(jié)構(gòu)更加密實(shí)；納米CaO作為水泥土外摻劑在水泥土中將土團(tuán)粒能夠相對(duì)更加緊密膠結(jié)的同時(shí)，也細(xì)化了孔隙。 （4）摻加納米CaO的水泥土的應(yīng)力-應(yīng)變關(guān)系上升段時(shí)似彈性變形階段的曲線斜率要與同養(yǎng)護(hù)齡期同水泥摻入比的斜率大。 （5）經(jīng)過擬合得到水泥土變形模量與抗壓強(qiáng)度關(guān)系式為：E50=64qu，，納米CaO水泥土變形模量與抗壓強(qiáng)度關(guān)系式為：E50=73qu。
[Abstract]:Cement soil is widely used in all kinds of soft soil reinforcement projects because of its convenient construction, small impact on the surrounding environment, low price and remarkable reinforcement effect. Cement soil is a kind of artificial improved soft soil material. The cement soil which needs to be treated by mixing with cement has the characteristics of integrity, low compressibility and water stability. But after later verification, it is found that the large deformation of cement soil is limited in many applications because of its low strength. According to the excellent properties of nanomaterials, nanometer CaO was mixed into cement soil. Through orthogonal design and comprehensive test, the paper analyzed the conditions of different cement blending ratio and different nano-CaO blending ratio of nano-CaO cement soil. The change rule of unconfined compressive strength of cement-soil is obtained, and the change of cement-soil strength is compared by sonic velocimetry test after different curing age of CaO cement soil. The stress-strain relationship and strength growth of nanometer CaO cement soil were analyzed, and the microstructure characteristics and structural changes of pure cement soil and nano-CaO cement soil were analyzed by electron microscope. The study found that: 1) in the orthogonal design experiment, it is found that the cement content is 20, the ratio of nanometer CaO is 10 鈥

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