Like peanuts look like building materials, very light and mixed with the use of cement.
You say is the ceramsite,Ceramics ah obviously do the insulation.
Ceramics, generally used in the roof, with heat insulation
Gray color is right (mostly gray, and some red)? This is a ceramic, a light material, the appearance is very hard, there are a lot of holes, so their relatively light Is used to do arbitrage concrete, generally used in the bathroom and other parts, to reduce the weight of the floor. However, now we rarely use this material here, I was in . when seen Chuang cut demolition waste belly sand pesto very useful. From the beginning of . I contacted some of the pipes (concrete, hollow, specific name forgotten, but also poured in the concrete inside to reduce their weight).