本文選題：泡沫混凝土　切入點(diǎn)：穩(wěn)定性　出處：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：近年來,泡沫混凝土得到了越來越廣泛的應(yīng)用。但實(shí)際運(yùn)用中常出現(xiàn)塌陷、沉降大等漿體不穩(wěn)定現(xiàn)象;此外,對(duì)泡沫混凝土穩(wěn)定性的認(rèn)識(shí)也不盡一致。本文的目的是探討泡沫混凝土穩(wěn)定的概念和表示方法,分析影響穩(wěn)定性的主要因素,配制出穩(wěn)定性良好的泡沫混凝土。本文首先從泡沫混凝土硬化成型的角度明確了泡沫混凝土穩(wěn)定性的概念,認(rèn)為穩(wěn)定性即泡沫混凝土硬化后在豎向保持具有細(xì)小、均勻、封閉的孔結(jié)構(gòu)且澆筑表面無沉降或沉降較小狀態(tài)的性質(zhì)。新拌混凝土的狀態(tài)和硬化泡沫混凝土的結(jié)構(gòu)可以反映穩(wěn)定性的大小,提出了定量表示泡沫混凝土穩(wěn)定性的指標(biāo)體系,即泡沫混凝土的沉降率、動(dòng)態(tài)體積吸水率比、平均孔徑比、圓度值分布等。在上述工作的基礎(chǔ)上,研究了發(fā)泡劑濃度、水灰比、聚羧酸減水劑、增稠劑HPMC等參數(shù)對(duì)泡沫混凝土穩(wěn)定性的影響,測(cè)定相應(yīng)的指標(biāo)參數(shù)并分析各因素對(duì)泡沫混凝土穩(wěn)定性的規(guī)律。結(jié)果表明,所提出的指標(biāo)泡沫混凝土的沉降率、動(dòng)態(tài)體積吸水率比、平均孔徑比等用于表示穩(wěn)定性是合適的;同時(shí),得到了這些因素對(duì)穩(wěn)定性影響的規(guī)律性,即隨著發(fā)泡劑稀釋濃度的增加,水灰比的增大,減水劑摻量和HPMC摻量的提高,泡沫混凝土穩(wěn)定性均呈現(xiàn)先提高后降低的作用,這些因素對(duì)泡沫混凝土的穩(wěn)定性均具有一個(gè)最佳值。按照本文確定的各因素最佳值,即發(fā)泡劑稀釋30倍,水灰比0.45,聚羧酸減水劑和HPMC摻量為水泥質(zhì)量的0.03%配制成干密度等級(jí)為500kg/m3的泡沫混凝土,物理力學(xué)性能優(yōu)良,其流動(dòng)度為180mm,干密度為514 kg/m3,28天抗壓強(qiáng)度為2.3MPa,導(dǎo)熱系數(shù)為0.118W/(m.K)。該混凝土的沉降率為1.5%,平均孔徑比為1.02且上部平均孔徑為150μm,具有良好的穩(wěn)定性。
[Abstract]:In recent years, foam concrete has been more and more widely used.However, collapse and large settlement are often found in practical application, and the understanding of the stability of foamed concrete is not consistent.The purpose of this paper is to discuss the concept and expression method of foam concrete stability, to analyze the main factors affecting the stability, and to prepare the foam concrete with good stability.In this paper, the concept of stability of foamed concrete is defined from the point of view of hardening and forming of foamed concrete. It is considered that the stability of foamed concrete is fine and uniform in the vertical direction after hardening.The property of a closed hole structure with no settlement or smaller settlement on the cast surface.The state of fresh concrete and the structure of hardened foam concrete can reflect the magnitude of stability. A quantitative index system for the stability of foam concrete is put forward, that is, the settlement rate of foam concrete, the dynamic volume water absorption ratio, and the average pore size ratio.Roundness distribution, etc.Based on the above work, the effects of foaming agent concentration, water-cement ratio, polycarboxylic acid water reducer and thickener HPMC on the stability of foamed concrete are studied.The corresponding index parameters were measured and the law of the stability of foamed concrete was analyzed.The results show that the proposed index, such as settlement rate, dynamic volumetric water absorption ratio and average pore diameter ratio, are suitable to express stability, and the regularity of the influence of these factors on stability is obtained.That is, with the increase of dilute concentration of foaming agent, the increase of water-cement ratio, the increase of water reducer and HPMC content, the stability of foamed concrete increases first and then decreases.These factors have an optimum value for the stability of foamed concrete.According to the optimum value of various factors determined in this paper, foaming agent diluted 30 times, water-cement ratio 0.45, polycarboxylic acid water-reducing agent and HPMC content 0.03% of cement mass, foamed concrete with dry density grade 500kg/m3 has good physical and mechanical properties.The flowability is 180 mm, the dry density is 514 kg / m ~ (3) and the compressive strength is 2.3 MPA for 28 days, and the thermal conductivity is 0.118 W / m ~ (3) 路K ~ (-1) 路m ~ (-1) 路m ~ (-1) 路m ~ (-1).The settlement rate of the concrete is 1.5, the average pore diameter ratio is 1.02 and the upper average pore diameter is 150 渭 m. The concrete has good stability.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 何順愛;朱曉燕;;憎水劑對(duì)超輕發(fā)泡混凝土性能的影響研究[J];混凝土與水泥制品;2016年03期

2 蘇謙;王亞威;趙文輝;朱俊杰;劉杰;;早強(qiáng)劑對(duì)泡沫輕質(zhì)混凝土抗壓強(qiáng)度及彈性模量的影響試驗(yàn)研究[J];鐵道建筑;2015年12期

3 李馳;方從啟;;料漿流動(dòng)度對(duì)雙氧水泡沫混凝土漿體穩(wěn)定性的影響[J];新型建筑材料;2015年08期

4 桑國(guó)臣;朱軼韻;楊崗;張浩博;;水灰比對(duì)輕質(zhì)水泥基泡沫材料性能的影響[J];材料科學(xué)與工程學(xué)報(bào);2015年03期

5 崔玉理;賀鴻珠;;溫度對(duì)泡沫混凝土性能影響[J];建筑材料學(xué)報(bào);2015年05期

6 趙懷霞;楊雷;羅樹瓊;管學(xué)茂;;外加劑對(duì)超輕質(zhì)泡沫混凝土性能的影響[J];新型建筑材料;2015年01期

7 胡曙光;關(guān)凌岳;王發(fā)洲;楊露;齊廣華;張旭龍;;泡間水對(duì)泡沫混凝土抗壓強(qiáng)度影響規(guī)律研究[J];功能材料;2013年S2期

8 徐婷婷;蔣寧山;劉連新;郭琳;王鵬;;外加劑對(duì)泡沫混凝土強(qiáng)度和干密度的影響研究[J];青海大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年06期

9 謝慧東;郭中光;于寧;張?jiān)骑w;楊云超;;早強(qiáng)劑對(duì)化學(xué)發(fā)泡泡沫混凝土性能影響的研究[J];新型建筑材料;2013年08期

10 喬歡歡;;泡沫混凝土的正交試驗(yàn)研究[J];墻材革新與建筑節(jié)能;2013年08期

相關(guān)碩士學(xué)位論文 前5條

1 關(guān)凌岳;泡沫混凝土孔結(jié)構(gòu)表征與調(diào)控方法及其性能研究[D];武漢理工大學(xué);2014年

2 李浩然;高穩(wěn)定發(fā)泡劑與泡沫混凝土的優(yōu)化設(shè)計(jì)及性能研究[D];南京航空航天大學(xué);2014年

3 趙春新;聚合物改性水泥基泡沫混凝土的試驗(yàn)研究[D];重慶大學(xué);2012年

4 申繪芳;復(fù)合自保溫混凝土砌塊砌體的試驗(yàn)研究[D];浙江工業(yè)大學(xué);2010年

5 張艷鋒;聚丙烯纖維增強(qiáng)粉煤灰泡沫混凝土的工藝研究[D];長(zhǎng)安大學(xué);2007年

，

本文編號(hào)：1721640