Study on the preparation and properties of high-porosity foamed concretes based on ordinary Portland cement

摘要: Abstract Fire-resistant, low-cost, high-porosity foamed concretes, which have desirable thermal-insulation properties and can be cast in-place, were prepared by adding preformed foam to ordinary Portland-cement slurries. The air-void structure, hardened properties, curing method, stability of the fresh concrete investigated. results indicated that concretes with porosities 88.5%–95.4%, compressive strengths 0.12 MPa–0.75 MPa, low thermal conductivities 0.036 W m − 1  K 0.063 W m could obtained addition foam. Moreover, an accelerator dosages a superplasticizer, as well reduction in water-to-cement ratio prevented collapse concrete. Small sizes narrow distributions these increasing apparent density, suitable superplasticizer. In addition, humidity-insulated enhanced strength