本文選題：輕混凝土 + 原位發(fā)泡��； 參考：《安徽工業(yè)大學》2014年碩士論文

【摘要】：輕混凝土在減輕建筑地基載荷,建筑節(jié)能和建筑抗震方面具有突出的意義,而通過發(fā)泡方法獲得輕混凝土是一個非常有效的手段,本文以過氧化氫溶液(質(zhì)量濃度為30%)為化學發(fā)泡劑,污泥燒脹陶粒(簡稱“陶粒”)和膨脹珍珠巖為輕集料,通過普通化學發(fā)泡法(將H2O2直接加入水泥料漿中發(fā)泡)和對化學發(fā)泡過程控制的原位發(fā)泡法制備出一系列輕混凝土試樣,并對其性能進行了系統(tǒng)的表征。在普通化學發(fā)泡法制備輕混凝土的研究中發(fā)現(xiàn):1)輕混凝土試樣的容重、力學強度和導熱系數(shù)均隨發(fā)泡劑量的增加而降低,當發(fā)泡劑加入量為膠凝材料質(zhì)量的2%和4%時,試樣的容重分別為950 kg/m3和600 kg/m3,試樣的導熱系數(shù)分別為0.22 W·m-1·K-1和0.18 W·m-1·K-1,比不加發(fā)泡劑的試樣分別降低了25%和40%。發(fā)泡劑量為膠凝材料質(zhì)量2%試樣的抗壓強度接近13 MPa。2)輕混凝土的干縮率隨著發(fā)泡劑含量的增加而增大,當發(fā)泡劑量?膠凝材料質(zhì)量的2%時,其干縮率?460×10-6。和普通化學方法相比,原位化學發(fā)泡法是先將H2O2加載在膨脹珍珠巖載體中,再通過載體間接進入輕集料之間的水泥料漿中后發(fā)泡,發(fā)泡過程和氣泡分布可以被控制,為獲得精細結(jié)構(gòu)的輕混凝土提供了可能,文中首先制備了以膨脹珍珠巖為輕細集料,明膠為穩(wěn)泡劑的原位發(fā)泡輕混凝土試樣,研究中發(fā)現(xiàn):1)輕混凝土試樣的容重、力學強度和導熱系數(shù)隨發(fā)泡劑量的增加而降低;隨穩(wěn)泡劑量的增加而增加。當穩(wěn)泡劑濃度為1.5%時,含1.4%發(fā)泡劑的試樣28 d抗壓強度可以高達21 MPa,2.8%發(fā)泡劑試樣28 d抗壓強度可高達15 MPa,其容重僅為800kg/m3。2)試樣的吸水率隨發(fā)泡劑量的增加而增加,隨穩(wěn)泡劑量的增加而降低。發(fā)泡劑為2.8%的試樣,穩(wěn)泡劑由1%增加到1.5%,其吸水率由26%降低到13%。另外,文中還以陶粒作輕粗集料,HPMC為增稠劑,化學發(fā)泡劑的量設(shè)定為2.8%,制備出一系列原位發(fā)泡陶粒輕混凝土試樣,研究中發(fā)現(xiàn)增稠劑對原位發(fā)泡輕混凝土性能的影響較大。1)當增稠劑量在0.05%~0.125%范圍內(nèi)時,試樣的容重、力學強度和導熱系數(shù)隨增稠劑量的增加而增加,干縮率和吸水率隨增稠劑量的增加而降低。2)當增稠劑量為0.125%時,試樣的28 d抗壓強度為31 MPa,容重為1245 kg/m3;試樣的吸水率僅為6.1%。與增稠劑量為0.05%的試樣相比,增稠劑量為0.125%的試樣吸水率降低了21%;干縮率降低了42%。3)增稠劑量為0.05%試樣的導熱系數(shù)為0.27 W·m-1·K-1。
[Abstract]:Light concrete is of great significance in reducing the load of building foundation, building energy saving and building aseismic, and obtaining light concrete by foaming method is a very effective means. In this paper, hydrogen peroxide solution (mass concentration is 30) is used as chemical foaming agent, sludge is burned expanded ceramsite ("ceramsite") and expanded perlite is used as light aggregate. A series of lightweight concrete samples were prepared by chemical foaming method (adding H2O2 directly into cement slurry) and in situ foaming method which controlled the chemical foaming process. The properties of the samples were systematically characterized. In the study of preparing light concrete by chemical foaming method, it was found that the bulk density, mechanical strength and thermal conductivity of lightweight concrete samples decreased with the increase of foaming agent content, and when the foaming agent was added to the mass of cementing material, the content of foaming agent was 2% and 4% respectively. The bulk weight of the sample is 950 kg/m3 and 600kg / m3, and the thermal conductivity of the sample is 0.22 W m-1 K-1 and 0.18 W m-1 K-1, which is 25% and 40% lower than that of the sample without foaming agent, respectively. The dry shrinkage rate of lightweight concrete increases with the increase of foaming agent content, when the amount of foaming agent is increased, when the content of foaming agent is increased, the compressive strength of the sample is close to 13MPa.2. The dry shrinkage rate of cementitious material is 460 脳 10 ~ (-6). Compared with the conventional chemical method, the in-situ chemical foaming method first loads H2O2 in the expanded perlite carrier, then indirectly enters the cement slurry between lightweight aggregates through the carrier, and then foams. The foaming process and bubble distribution can be controlled. In order to obtain the possibility of light concrete with fine structure, in this paper, the sample of in-situ foamed light concrete with expanded perlite as light fine aggregate and gelatin as foam stabilizer is first prepared. It is found in the study that the bulk weight of lightweight concrete specimen is 1: 1. The mechanical strength and thermal conductivity decreased with the increase of the amount of foaming agent, and increased with the increase of foam stabilization dose. When the concentration of foaming agent is 1.5, the 28d compressive strength of the sample containing 1.4% foaming agent can be as high as 21 MPA / 2. 8% foaming agent sample 28 days compressive strength can be up to 15 MPA, and its bulk weight is only 800 kg / m ~ (3.2) the water absorbency of the sample increases with the increase of foaming agent content. With the increase of the stable bubble dose, it decreases. When the foaming agent is 2.8%, the foam stabilizer increases from 1% to 1.5%, and the water absorption rate decreases from 26% to 13%. In addition, a series of in-situ foamed ceramic lightweight concrete samples were prepared by using ceramsite as light coarse aggregate and HPMC as thickener and chemical foaming agent as 2.8. It is found that thickener has a great influence on the properties of in-situ foamed lightweight concrete. 1) when the thickener content is in the range of 0.050.125%, the bulk density, mechanical strength and thermal conductivity of the sample increase with the increase of the thickener content. When the thickener content is 0.125, the compressive strength of the sample is 31 MPA, the bulk weight is 1245 kg / m ~ (3), and the water absorption of the sample is only 6.1 / m ~ (3). Compared with the sample with 0.05% thickener, the water absorption of the sample with 0.125% thickener decreased 21, and the dry shrinkage decreased 42%. 3) the thermal conductivity of 0.05% thickener was 0.27 W m-1 K-1.
【學位授予單位】：安徽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

【參考文獻】

相關(guān)期刊論文 前1條

1 周杰;安風華;凌天清;;輕集料混凝土的研究與應用現(xiàn)狀分析[J];山西建筑;2006年13期

，

本文編號：1882333