本文選題：礦粉　切入點：膠凝活性　出處：《安徽建筑大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：礦粉與水泥有著相似的化學(xué)組成,具有潛在活性,是綠色環(huán)保、價格低廉的建筑材料之一。用礦粉替代水泥,可降低混凝土生產(chǎn)成本,減少水泥生產(chǎn)所帶來的污染。本課題系統(tǒng)研究了礦粉摻量分別為40%、50%、60%的水泥-礦粉膠凝體系的活性以及高摻礦粉混凝土的氯離子滲透性。分別采用摻加復(fù)合激發(fā)劑Na2CO3和Na2SO4以及提高養(yǎng)護溫度兩種方式來激發(fā)水泥-礦粉膠凝體系的活性,同時研究了高摻礦粉混凝土在不同條件下的強度以及抗氯離子滲透性,并分析了高摻礦粉混凝土的微觀結(jié)構(gòu),主要研究內(nèi)容如下:通過水泥-礦粉膠砂強度來間接評價膠凝體系的活性,確定復(fù)合激發(fā)劑Na2CO3和Na2SO4最佳配比為1:1,最佳摻量為3%。復(fù)合激發(fā)劑Na2CO3和Na2SO4可以提高抗折強度,從而改善砂漿的韌性。分別研究了養(yǎng)護溫度為20℃、30℃、40℃對礦粉活性的激發(fā)效果,結(jié)果發(fā)現(xiàn)最優(yōu)的養(yǎng)護溫度為30℃,且養(yǎng)護溫度為30℃時的活性激發(fā)效果優(yōu)于摻加復(fù)合激發(fā)劑的活性激發(fā)效果。通過測試不同條件下的高摻礦粉混凝土立方體抗壓強度以及電通量試驗,發(fā)現(xiàn)養(yǎng)護溫度為30℃且不添加激發(fā)劑的條件下,混凝土的抗壓強度幾乎沒有損失,并且抗氯離子滲透性較好;添加復(fù)合激發(fā)劑Na2CO3和Na2SO4能提高高摻礦粉混凝土的抗氯離子滲透性能。采用Rapid Air457氣孔結(jié)構(gòu)分析儀研究了高摻礦粉混凝土的微觀結(jié)構(gòu),發(fā)現(xiàn)與不摻礦粉的混凝土相比,摻礦粉混凝土內(nèi)部封閉氣孔含量相對較多,且孔隙之間間距較大。同時發(fā)現(xiàn),高摻礦粉混凝土的孔隙率及孔隙間距系數(shù)均與抗壓強度存在一定的相關(guān)性。
[Abstract]:Mineral powder and cement have similar chemical composition, potential activity, is one of the green and low cost building materials. Replacing cement with mineral powder can reduce the production cost of concrete. In order to reduce the pollution caused by cement production, the activity of cementitious cementitious system with 40% mineral powder and the chloride ion permeability of concrete with high mineral powder content of 40% and 50% respectively were studied systematically in this paper. Na2CO3 and Na2SO4 and raising curing temperature are two ways to stimulate the activity of cement-mineral powder cementitious system. At the same time, the strength and resistance to chloride ion permeability of high mineral powder concrete under different conditions are studied, and the microstructure of high mineral powder concrete is analyzed. The main research contents are as follows: the activity of cementing system is indirectly evaluated by the strength of cement and mineral powder cement sand, the optimum ratio of Na2CO3 and Na2SO4 is 1: 1, the optimum dosage is 3. The composite activator Na2CO3 and Na2SO4 can improve the flexural strength. In order to improve the toughness of mortar, the activation effect of curing temperature of 20 鈩，

本文編號：1570149