本文選題：高鋁水泥　切入點(diǎn)：泡沫混凝土　出處：《西南科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：高鋁水泥具有早期強(qiáng)度高、耐高溫、抗硫酸鹽侵蝕的特點(diǎn),但是其后期強(qiáng)度易倒縮,限制了高鋁水泥的應(yīng)用范圍。泡沫混凝土作為一種輕質(zhì)、保溫隔熱的多孔材料備受親耐,但其氣孔率高、易干縮等問題也不容忽視。在高鋁水泥中摻入礦物摻和料來制作泡沫混凝土,既解決了高鋁水泥后期強(qiáng)度倒縮問題,又達(dá)到節(jié)能利廢的目的,使泡沫混凝土更加綠色、環(huán)保。本文通過性能測試、微觀分析等研究了四種礦物摻和料(石灰石、石膏、粉煤灰、礦渣)對高鋁水泥物理力學(xué)性能的影響,同時研究了在最佳摻量下制作的泡沫混凝土的力學(xué)性能、保溫隔熱性能等。研究結(jié)果表明:(1)石灰石、石膏、粉煤灰、礦渣均能抑制高鋁水泥后期強(qiáng)度倒縮;(2)石灰石、石膏、粉煤灰、礦渣的最佳摻量分別是10%、15%、5%、5%,在此范圍,石灰石、石膏、粉煤灰的摻入對高鋁水泥各齡期強(qiáng)度提升起到一定作用,礦渣沒有貢獻(xiàn)。(3)當(dāng)摻量都為10%時,石灰石、石膏、粉煤灰、礦渣都能加速高鋁水泥早期水化,釋放大量熱量。(4)在水灰比為0.5、聚丙烯纖維摻量為0.02%的前提下,摻入10%石灰石制作泡沫混凝土,由于石灰石與高鋁水泥水化產(chǎn)物發(fā)生反應(yīng)生成穩(wěn)定的單碳型水化碳鋁酸鈣(C3A·CaC03·11H20),使其強(qiáng)度及導(dǎo)熱系數(shù)增大,吸水率、干燥收縮值減小;當(dāng)泡沫混凝土干密度為500Kg/m3時,7d、28d抗壓強(qiáng)度和抗折強(qiáng)度為 1.57MPa、1.80MPa 和 1.O1MPa、1.49MPa;7d、28d 干縮值為 1190×10-6、1280×10-6;導(dǎo)熱系數(shù)為 0.1390 W/(m·K)。(5)摻入15%石膏制作泡沫混凝土,由于石膏改變了高鋁水泥的水化路徑,生成穩(wěn)定的鈣礬石(Aft),使其強(qiáng)度及導(dǎo)熱系數(shù)增大,吸水率、干燥收縮值減小;當(dāng)泡沫混凝土干密度為500Kg/m3時,7d、28d抗壓強(qiáng)度和抗折強(qiáng)度為1.56MPa、1.98MPa和0.99MPa、1.54MPa,分別提高2.63%、13.79%和 2.02%、4.19%;吸水率為 21.04%,降低 7.02%;7d、28d 干縮值為,1160×10-6、1270×10-6 分別降低 10.08%、7.79%;導(dǎo)熱系數(shù)為 0.1393W/(m·K),升高7.98%。(6)摻入5%粉煤灰制作泡沫混凝土,粉煤灰的填充效應(yīng)、火山灰效應(yīng)以及C-H-S凝膠與高鋁水泥水化產(chǎn)物反應(yīng)生成水化鈣黃長石(C2ASH8),使其強(qiáng)度增大,吸水率、干燥收縮值減小。當(dāng)泡沫混凝土干密度為500Kg/m3時,28d抗壓強(qiáng)度和抗折強(qiáng)度為1.90MPa、1.51MPa,分別提高9.20%、5.78%,7d、28d 干縮值為 1280×10-6、1370×10-6 降低 6.45%、6.05%。
[Abstract]:High alumina cement has the characteristics of high early strength, high temperature resistance and sulfate erosion resistance, but its later strength is easy to shrink, which limits the application scope of high aluminum cement. However, the problems of high porosity and easy drying and shrinkage can not be ignored. Adding mineral admixture to make foamed concrete can not only solve the problem of shrinkage of strength in the later stage of high aluminum cement, but also achieve the purpose of saving energy and making waste. In this paper, the effects of four mineral admixtures (limestone, gypsum, fly ash, slag) on the physical and mechanical properties of high alumina cement are studied by means of performance test and microscopic analysis. At the same time, the mechanical properties and thermal insulation properties of foamed concrete made under the optimum content are studied. The results show that the limestone, gypsum, fly ash and slag can all restrain the later strength of high aluminum cement from collapsing to 2) limestone and gypsum. The optimum amount of fly ash and slag is 10 / 15 / 55 respectively. In this range, the addition of limestone, gypsum, and fly ash plays a certain role in enhancing the strength of high alumina cement at all ages. The slag has no contribution.) when the addition is 10%, limestone, gypsum, Fly ash and slag can accelerate the early hydration of high alumina cement and release a great deal of heat. At the premise of water / cement ratio of 0.5 and polypropylene fiber of 0.02%, 10% limestone is added to make foam concrete. Due to the reaction between limestone and hydration products of high alumina cement, stable single carbon calcium carbonate hydrate (C3A 路CaC03 路11H20) is formed, which increases its strength and thermal conductivity, decreases its water absorption and drying shrinkage. When the dry density of foamed concrete is 500kg / m ~ 3, the compressive strength and flexural strength of foamed concrete are 1.57 MPA and 1.49 MPA / 28d respectively when the dry density of foamed concrete is 500kg / m ~ (3) and the dry shrinkage value is 1190 脳 10 ~ (-6) m 路K ~ (-1) and the thermal conductivity is 0.1390 W / m 路K ~ (-5) / m ~ (-1) / m ~ (-1) / m ~ (-1) / m ~ (-1) / m ~ (-1). 15% gypsum is added into the foam concrete to make foam concrete, because gypsum has changed the hydration path of high aluminum cement. A stable ettringite is formed, which increases its strength and thermal conductivity, decreases its water absorption and drying shrinkage. When the dry density of foamed concrete is 500 kg / m ~ 3, the compressive strength and flexural strength are 1.56 MPA and 0.99 MPA and 1.54 MPA, respectively, which increase by 2.63 ~ 13.79% and 2.022 ~ (4.19) respectively; the water absorption rate is 21.04, and the dry shrinkage value of 7.027 days is reduced to 11.60 脳 10 ~ (-6) ~ 1270 脳 10 ~ (-6); the thermal conductivity is 0.1393 W / m 路K ~ (-1) and 7.98%. 6) the dry shrinkage value of 7.027 days is reduced to 10.087.79; and the thermal conductivity is 0.1393 W / m 路K ~ (-1) and 7.98%. Ash to make foam concrete, The filling effect of fly ash, the pozzolanic effect and the reaction of C-H-S gel with the hydration product of high aluminum cement gave hydrated calcium feldspar C2ASH8, which increased its strength and water absorption. When the dry density of foamed concrete is 500 kg / m ~ 3, the compressive strength and flexural strength of foamed concrete are 1.90 MPA / m ~ 3 for 28 days and 1.51 MPa for 1.90 MPA / m ~ 3, respectively, and the dry shrinkage value of 9.20 ~ 5.78 ~ 5.78 days is increased to 1280 脳 10 ~ (-6) ~ (-1) 脳 10 ~ (-6) 脳 10 ~ (-6) m ~ (-6), and 6.45 ~ (-5) m ~ (-5) is decreased respectively.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

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