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Effect of foam volume on penetration parameters of foamed concrete
Magazine of Concrete Research ( IF 2.7 ) Pub Date : 2022-05-31 , DOI: 10.1680/jmacr.21.00247
Mohammad Mahdi Rastegar 1 , Alireza Bagheri 2
Affiliation  

In this research, the effect of porosity owing to foam on the penetration parameters of foamed concrete, including absorption and chloride ingress, is evaluated. The penetration parameters of foamed concrete are determined using a water/cement (w/c) ratio of 0.5 and foam contents of 20, 35 and 50%, and then compared with the base mix without foam and with an equal w/c ratio. In addition, the penetration parameters of the structural-grade foam concrete with a w/c ratio of 0.4 and foam volume of 20% are determined and compared with a conventional concrete of equal strength. The results show that, with an increase in foam porosity, the volumetric absorption and the capillary absorption coefficient are decreased, and that therefore chloride diffusion is increased. The discrepancy is owing to the presentation of absorption results based on a total concrete volume. By considering these results based on paste volume, which is the penetrable phase, absorption results show the same trend as the chloride diffusion results. Increased foam volume results in larger and more connected air voids. Meanwhile, the structural-grade foam concrete has a similar performance to the base mix, and also shows less penetrability relative to conventional concrete of equal strength.

中文翻译:

泡沫体积对泡沫混凝土渗透参数的影响

在这项研究中,评估了由泡沫引起的孔隙率对泡沫混凝土渗透参数的影响,包括吸收和氯化物进入。使用 0.5 的水/水泥 (w/c) 比和 20、35 和 50% 的泡沫含量来确定泡沫混凝土的渗透参数,然后与不含泡沫和相同 w/c 比的基础混合物进行比较。此外,确定了水灰比为0.4、泡沫体积为20%的结构级泡沫混凝土的渗透参数,并与同等强度的常规混凝土进行了比较。结果表明,随着泡沫孔隙率的增加,体积吸收和毛细吸收系数降低,因此氯化物扩散增加。差异是由于基于总混凝土体积的吸收结果的呈现。通过考虑基于浆料体积(即可渗透相)的这些结果,吸收结果显示出与氯化物扩散结果相同的趋势。增加的泡沫体积导致更大和更多连接的空气空隙。同时,结构级泡沫混凝土具有与基础混合料相似的性能,并且相对于同等强度的常规混凝土,其渗透性也较低。
更新日期:2022-05-31
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