1．前言建筑业是一个巨大的市场，成为我国新的经济增长点，每年新建住宅近10亿m2，墙体材料需要10亿吨。至1998年全国的墙体材料84％仍是粘土砖，新型建材仅占16％，这与我国地少人多。限制取土烧砖的基本国策形成尖锐矛盾，尤其在经济较发达的沿海城市，建筑业发展迅猛，一般 1. Foreword The construction industry is a huge market and has become China’s new economic growth point. Every year, nearly 1 billion m2 of new residential buildings are built, and the wall material needs 1 billion tons. By 1998, 84% of the country’s wall materials were still clay bricks, and new building materials accounted for only 16%, which is more than the number of people in China. The basic national policy of restricting the borrowing and burning of bricks creates a sharp contradiction, especially in the more economically developed coastal cities, the construction industry is developing rapidly, generally