Efficient sound-absorbing lightweight aggregate cellular concrete, method for preparing the same, and application thereof

An efficient sound-absorbing lightweight aggregate cellular concrete, comprising:

• 85-95 parts by weight of sulfur-aluminum-ferric cementitious material, 5-15 parts by weight of supplementary cementitious material, 0.6-1.5 parts by weight of functional admixture, 20-60 parts by weight of non-sintered lightweight aggregate, 0.35-0.45 parts by weight of water, and 0.5-1.5 L of preformed foam;
• wherein the non-sintered lightweight aggregate comprises, based on parts by weight:
• 40-50 parts of sulfur-aluminum-ferric cementitious material, 50-60 parts of byproduct gypsum, 0.7-1.5 parts of chemical foaming agent, 15-22 parts of water, and 5-8 parts of expanded perlite;
• the efficient sound-absorbing lightweight aggregate cellular concrete has a noise reduction coefficient ≥0.80 and a bulk density≤500 kg/m3;
• the functional admixture comprises, based on parts by weight:
• 0.2-0.6 parts of water reducer, 0.1-0.3 parts of thickener, and 0.3-0.6 parts of chopped fiber;
• the efficient sound-absorbing lightweight aggregate cellular concrete constructs a multi-level and multi-scale pore structure system comprising expanded perlite pores, chemical foaming agent foaming pores, and physical foaming pores;
• the supplementary cementitious material comprises slag, fly ash, or silica fume;
• a method for preparing the efficient sound-absorbing lightweight aggregate cellular concrete comprises:
• step 1:
• stirring the sulfur-aluminum-ferric cementitious materials, the supplementary cementitious material, the functional admixture, and water to form a uniformly mixed slurry;
• step 2:
• adding a pre-wetted non-sintered lightweight aggregate into the uniformly mixed slurry, and continuing to stir;
• and
• step 3:
• adding the preformed foam, and stirring until no white foam remains, then casting in a mold for solidification, which can be demolded after 6-8 hours, thus completing the preparation of the efficient sound-absorbing lightweight aggregate cellular concrete;
• in step 2, a method for preparing the non-sintered lightweight aggregate comprises:
• mixing the sulfur-aluminum-ferric cementitious materials and the by-product gypsum in dry form uniformly to form a mixture;
• using the expanded perlite as a seed particle, and in a granulator, spraying the mixture while simultaneously spraying a mixture of chemical foaming agent and water, to complete the preparation of the non-sintered lightweight aggregate.