本文關(guān)鍵詞： 粉煤灰 纖維 水膠比 強(qiáng)度 導(dǎo)熱系數(shù)　出處：《石家莊鐵道大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本論文在選擇優(yōu)異發(fā)泡劑的基礎(chǔ)上,研究了水膠比、粉煤灰、纖維等因素對(duì)泡沫混凝土性能的影響及影響規(guī)律,研制出一系列不同容重的高強(qiáng)、低導(dǎo)熱系數(shù)的泡沫混凝土。試驗(yàn)結(jié)果表明:(1)在相同容重下,隨著粉煤灰摻量的增加,其28天抗壓強(qiáng)度呈上升趨勢(shì),而且在設(shè)計(jì)容重越大的情況下強(qiáng)度受水膠比影響越小。當(dāng)容重為700kg·m-3時(shí),粉煤灰摻量為30%時(shí)28天抗壓強(qiáng)度最高可達(dá)5.75MPa,比普通泡沫混凝土抗壓強(qiáng)度(0.5~2.0 MPa)至少要高187.5%。(2)當(dāng)粉煤灰摻量為30%時(shí),可明顯降低泡沫混凝土的導(dǎo)熱系數(shù),最小僅為0.08W/(m·K)。這比普通泡沫混凝土導(dǎo)熱系數(shù)0.2~0.5W/(m·K)至少要降低60%。(3)纖維可以顯著提高泡沫混凝土的28d抗壓強(qiáng)度,并且隨著聚丙烯纖維摻量的增加,泡沫混凝土28d的抗壓強(qiáng)度呈增大趨勢(shì),本實(shí)驗(yàn)條件下纖維的最佳摻量為1‰。(4)本實(shí)驗(yàn)條件下,用硫鋁酸鹽水泥取代普通硅酸鹽水泥的15%,粉煤灰摻量為干粉料總量的30%,水膠比為0.44,外加劑(減水劑)為膠材總量的5‰,纖維為膠材總量的1‰時(shí),泡沫混凝土的抗壓強(qiáng)度、導(dǎo)熱系數(shù)、流動(dòng)性能最佳,制得的新型高強(qiáng)泡沫混凝土強(qiáng)度分別達(dá)到了1.48 MPa(400 kg·m-3),2.1 MPa(500 kg·m-3),3.87MPa(600 kg·m-3)和5.75MPa(700 kg·m-3)。
[Abstract]:On the basis of selecting excellent foaming agent, the influence of water / binder ratio, fly ash, fiber and other factors on the properties of foamed concrete is studied in this paper. A series of high strength with different bulk density are developed. Foam concrete with low thermal conductivity. The experimental results show that under the same bulk density, with the increase of the content of fly ash, the compressive strength of the concrete increases at 28 days. And the greater the bulk density of the design is, the less the strength is affected by the water-binder ratio. When the bulk density is 700kg 路m-3, The compressive strength of the foamed concrete is up to 5.75 MPa in 28 days, which is at least 187.5% higher than that of ordinary foamed concrete (0.5 ~ 2.0 MPa).) when the content of fly ash is 30, the thermal conductivity of foamed concrete can be significantly reduced. The minimum value is only 0.08W / / m 路Kn.This is at least 60.1% lower than ordinary foamed concrete's thermal conductivity (0.2W / m 路K). The 28d compressive strength of foamed concrete can be increased significantly by the addition of polypropylene fiber, and the compressive strength of foamed concrete increases with the increase of polypropylene fiber content. Under this experimental condition, the optimum fiber content is 1 鈥，

本文編號(hào)：1506699