The lightweight aggregate concrete cushion is composed of lightweight aggregates (such as ceramsite, expanded perlite, foamed plastic particles, etc., and the bulk density is less than1100kg/m³）、 A lightweight structural layer made of cement, water, and additives, laid below the building structure layer. Its core performance includes:lightweightThe dry bulk density is generally800-1900kg/m³， Only 1/3-2/3 of ordinary concrete)thermal insulation(Thermal conductivity)0.08-0.25W/Superior to ordinary concrete)sound insulation and vibration damping(Air sound insulation)40-50dB， Can effectively reduce the transmission of impact sound)Good crack resistance(Low elastic modulus, strong deformation adaptability).

The main applicable scenarios are:ground/Floor cushion layer(Used for residential, office buildings, hospitals and other buildings to reduce floor loads and improve sound insulation in lower level spaces)Roof insulation layer(doubles as a cushion layer and is used in conjunction with waterproof structures)Soft foundation treatment(Reduce the requirement for foundation bearing capacity and prevent uneven settlement).

Key points to be noted during construction:1. Pre wetting treatment of lightweight aggregate (watering 24 hours in advance, drying the surface before use to avoid water absorption and loss of concrete fluidity); 2. Mix proportion control (cement dosage is generally 200-300kg/m ³, sand ratio is 30% -40%, slump is 50-100mm); 3. Laying and vibration (using flat plate vibrators or rollers for light pressure to avoid excessive vibration causing light aggregates to float and layer); 4. Maintenance (covering and moisturizing within 12 hours after pouring, with a maintenance time of not less than 7 days to prevent surface cracking).

Its advantages lie in:Reduce structural load(Especially suitable for high-rise buildings or weak foundations)Improve thermal performance(Reduce air conditioning energy consumption)Easy construction(No heavy equipment required, can be mixed on-site). It should be noted that lightweight aggregate concrete has lower strength (compressive strength is generally1.5-10MPa）， Not suitable for floors that can withstand heavy loads (such as warehouses and workshops).