本文選題：玄武巖纖維 + 再生混凝土　； 參考：《遼寧工業(yè)大學(xué)》2017年碩士論文

【摘要】：再生混凝土是一種將廢棄混凝土破碎、篩分及沖洗后,部分或全部替代天然骨料重新配制而成的新型混凝土材料,實(shí)現(xiàn)了建筑材料資源的循環(huán)可持續(xù)利用,對促進(jìn)生態(tài)協(xié)調(diào)具有重要的意義。為了滿足日益增加的人口住房需求,高層、超高層、大跨度建筑應(yīng)運(yùn)而生,而火災(zāi)嚴(yán)重威脅著建筑物的安全性,一旦建筑火災(zāi)發(fā)生造成結(jié)構(gòu)坍塌,將會(huì)對人民群眾的生命及財(cái)產(chǎn)帶來巨大的損失,提高結(jié)構(gòu)的抗火性能成為我們關(guān)注的焦點(diǎn)。在再生混凝土中加入玄武巖纖維,利用纖維的耐高溫、強(qiáng)度高及化學(xué)穩(wěn)定性好等特性提高再生混凝土高溫后力學(xué)性能,因此對玄武巖纖維再生混凝土高溫后力學(xué)性能的研究是非常必要的。本文首先研究了C40再生混凝土在配合比不變的條件下,玄武巖纖維摻入方式、摻入體積率對高溫(200℃、400℃、600℃)作用后玄武巖纖維再生混凝土的質(zhì)量損失率、基本力學(xué)性能及各個(gè)力學(xué)性能之間相互關(guān)系的影響。摻入方式為水泥漿包裹纖維摻入及纖維直接摻入;摻入體積率為0.1%、0.15%、0.2%;力學(xué)性能有立方體抗壓強(qiáng)度、劈裂抗拉強(qiáng)度、軸心抗壓強(qiáng)度、靜彈性模量。其次研究了纖維摻入率對25次慢速凍融及高溫疊加作用后的纖維再生混凝土立方體抗壓、劈拉強(qiáng)度及其拉壓比的影響。最后給出了不同情況下各個(gè)力學(xué)性能與溫度的擬合曲線公式。試驗(yàn)結(jié)果表明:玄武巖纖維的加入可以降低高溫后再生混凝土的質(zhì)量損失率;高溫后玄武巖纖維再生混凝土的立方體抗壓、軸心抗壓強(qiáng)度在溫度為200℃時(shí)達(dá)到峰值,彈性模量、劈拉強(qiáng)度隨溫度上升則一直呈下降趨勢;玄武巖纖維對立方體抗壓強(qiáng)度、劈拉強(qiáng)度的提高幅度大于軸心抗壓強(qiáng)度、靜彈性模量,摻量為0.15%時(shí)表現(xiàn)最為明顯;水泥漿包裹纖維摻入方式優(yōu)于纖維直接摻入方式;25次慢速凍融及高溫疊加作用對纖維再生混凝土造成的強(qiáng)度損傷大于其分別作用的強(qiáng)度損傷之和。
[Abstract]:Recycled concrete is a new kind of concrete material, which is made up of broken, sifted and washed waste concrete, partly or completely replaced by natural aggregate, and realizes the sustainable utilization of building material resources.It is of great significance to promote ecological coordination.In order to meet the increasing housing needs of the population, high-rise, super-high-rise and long-span buildings emerged as the times require, and fire seriously threatened the safety of buildings. Once the building fire occurred, the structure collapsed.It will bring great loss to the lives and property of the people, and improve the fire resistance of the structure becomes the focus of our attention.By adding basalt fiber into recycled concrete, the mechanical properties of recycled concrete after high temperature can be improved by using the properties of high temperature resistance, high strength and good chemical stability.Therefore, it is necessary to study the mechanical properties of basalt fiber recycled concrete after high temperature.In this paper, the mass loss rate of recycled concrete of basalt fiber under the condition of constant mix ratio and volume ratio of basalt fiber is studied after the action of C40 recycled concrete at high temperature of 200 鈩，

本文編號(hào)：1747631