贝灰是以沿海地区的贝壳锻烧而成的一种建筑材料。用贝灰为胶结材料,加上一定比例的黄泥和河沙,拌和使用,这种材料叫贝灰三合土。汕头地区沿海各县,有许多贝壳资源。当地群众历来都有使用贝灰三合土建造民房、粪池,厕所和农田水利设施等的 Shell ash is a building material made from the shells of the coastal area. Shell ash for cementing materials, coupled with a certain percentage of yellow mud and river sand, mixing and use, this material is called lime-clay. Shantou coastal counties, there are many shells resources. The local people have always been using limestone and limestone tribe to build houses, septic tanks, toilets and farmland water conservancy facilities