新型高强泡沫混凝土的制备及其性能研究

发布时间：2018-02-12 22:25

  本文关键词： 粉煤灰 纤维 水胶比 强度 导热系数　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文在选择优异发泡剂的基础上,研究了水胶比、粉煤灰、纤维等因素对泡沫混凝土性能的影响及影响规律,研制出一系列不同容重的高强、低导热系数的泡沫混凝土。试验结果表明:(1)在相同容重下,随着粉煤灰掺量的增加,其28天抗压强度呈上升趋势,而且在设计容重越大的情况下强度受水胶比影响越小。当容重为700kg·m-3时,粉煤灰掺量为30%时28天抗压强度最高可达5.75MPa,比普通泡沫混凝土抗压强度(0.5~2.0 MPa)至少要高187.5%。(2)当粉煤灰掺量为30%时,可明显降低泡沫混凝土的导热系数,最小仅为0.08W/(m·K)。这比普通泡沫混凝土导热系数0.2~0.5W/(m·K)至少要降低60%。(3)纤维可以显著提高泡沫混凝土的28d抗压强度,并且随着聚丙烯纤维掺量的增加,泡沫混凝土28d的抗压强度呈增大趋势,本实验条件下纤维的最佳掺量为1‰。(4)本实验条件下,用硫铝酸盐水泥取代普通硅酸盐水泥的15%,粉煤灰掺量为干粉料总量的30%,水胶比为0.44,外加剂(减水剂)为胶材总量的5‰,纤维为胶材总量的1‰时,泡沫混凝土的抗压强度、导热系数、流动性能最佳,制得的新型高强泡沫混凝土强度分别达到了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，

本文编号：1506699