ABSTRACT
The idea of producing macroporous concrete (MPC) that has a structure characterized by a considerable volume of intergranular cavities, was first proposed in 1912 by N. A. Zhitkevich. Macroporous concrete is a non-sand material that is usually obtained from a mixture of dense or porous gravel or crushed stone, cement and water with a limited content of cement paste. The size of aggregates grains for concrete is usually within the range of 5 40 mm. Using more homogeneous and relatively fine aggregate reduces the MPC density and thermal conductivity coefficient as well as its air permeability. Analyzing mathematical models and graphic dependences on their basis, it can be concluded that the MPC strength depends on the cement stone strength. The MPC strength is also affected by addition of superplasticizer. Thus, macro-porous concrete obtained using fraction of 2.5 to 5 mm of granite siftings is quite competitive compared to"classic" wall materials. Its thermal resistance is similar to ceramic and silicate bricks.
