| Traditional organic flammable thermal insulation material is a huge fire hazard to buildings, and it will produce toxic substances after the decomposition, which has harmful effect on human health. Foamed concrete as a kind of inorganic thermal insulation material, has advantages of withstanding high temperatures and non-toxic after decomposition for replacing traditional organic flammable thermal insulation material, and makes it become an important research direction. But foamed concrete also has many disadvantages, for example, its strength is low, drying shrinkage and thermal conductivity are large. To solve these problems, this paper uses HCSA expanders, glycol and a compound of ordinary Portland cement and Sulphoaluminate cement to reduce drying shrinkage. The result shows that the set time of compound cement is rather short while its early stage strength is rather high, and it shows good economic benefits; increased HCSA expanders is most obvious to reduce drying shrinkage of foamed concrete.This paper adds aerogel to foamed concrete to improve its thermal insulation property. The result shows that with adding cellulose ethers and glycol, the insulation property is best when aerogel content is2%.This test also uses X-ray diffractometry and infrared spectrum analyzer to analyze changes in performance from the micro-level.Orthogonal experiment was used to study the influencing factors of compressive strength, water absorption rate, thermal conductivity and other properties of foamed concrete. It was found after analysis that the appropriate mixing amount of silica fume is around7%; aerogel needs to combine with cellulose ether and glycol; the diluted SBRL can be used for surface treatment; the appropriate mixing amount of early strength agent is2.75%; and the optimal mixing amount of HCSA expanders is1%.On the basis of the orthogonal test, the dispensation is further improved. The result shows that the proportion of foamed concrete after optimization performance can achieve or exceed the current standards. |
