Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 226, Issue -, Pages 280-287Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.07.302
Keywords
Alkali-activated slag cement; Foamed concrete; Foaming agent; Pore structure; Foam stability
Categories
Funding
- Natural Science Foundation of Shaanxi Province [2018JM5169, Z20180149]
- Science and Technology Development Project of Department of Construction of Shaanxi Province [2015-K87]
Ask authors/readers for more resources
Alkali-activated slag cement has the characteristics of high viscosity, quick hydration, setting and hardening, and high strength, which are suitable for the preparation of foamed concrete. Three foaming agents of sodium alpha-olefin sulfonate (AOS), sodium dodecyl sulfate (K12) and sodium alcohol ether sulphate (AES) with the same foam stabilizer of silicone resin polyether emulsion FM-500 (MPS) were used to prepare foam. The three foam properties are similar and foam stability of AOS and K12 is better than that of AES. Effective foam ratio is put forward to express stability of foam in paste slurry. Effective foam ratio and porosity has a great effect on dry apparent density of water glass-activated slag foamed concrete. With the increase of foam content, effective foam ratio of AES decreases obviously, while that of K12 and AOS show a slight decrease. At low foam content, AES can better reduce the dry apparent density. Increase foam content of AOS and K12 appropriately may reduce dry apparent density. R-sd and compressive strength of foamed concrete with AOS foam is the highest. When porosity is similar, average pore size and pore size distribution has a great effect on thermal conductivity and mechanical properties of AAS foamed concrete. Average pore size of O3 is smaller than that of K3 and E3. O3 also shows the narrowest air-void size distribution with the majority of the voids smaller than 400 mu m. Average roundness of three type foam is much the same. Foam stability is the main factor affecting pore structure of AAS foamed concrete. AOS can be preferred to prepare AAS foamed concrete. (C) 2019 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available