Study On The Environmental Impact Assessment And Improvement Of Cement & Concrete System

The content and the concept of Eco-materials is indagated by means of life-circle-assessment(LCA) methods in this paper. The relationship of functionality, economy and environment compatibility is discussed in detail. It is pointed out that the environment impact assessment is the most importment part of LCA during the practical Eco-materials research.It is the first time in this article the environment compatibility assessment method of cement & concrete system is set up .The edge conditions, subregion method, index of environment compatibility assessment system of cement&concrete is studied. The result shows that the pollution of power production and cement manufacture is the main sourece of cement production , the main environment effect aspect is the energy depletion potential and global warming potential. The key to improve the environment property of cement is to increase the energy efficiency, to decrease the carboant raw meal content and to improve the burn technology. It is impossible to improve the environment property with only decreasing the consumption of coal but increasing the consumption of power, which will turn the pollution from the cement manufacture to the power production. The main pollution of burning cement concentrate on the three index which are the energy depletion potential, global warming potential and photochemical oxidant formation.It is also the first time for the article to raise the design of recircuit concrete mix with the component similar as cement raw meal ingredient, and also the practicability, product property and environment impact is indagated by a series of experiments. The result shows that decreasing the cement content in concrete, decreasing the limestone content in raw meal of cement and increasing the recircuit aggregate content in concrete are the main way to improve the environment property. The most effective way to improve the environment property of concrete is to use slag powder in concrete. To use the non-limestone raw meal with higher calcium silicon ratio can get the cement with the same physical and chemicalproperty but better environment property. The synthetic environment property of recircuit concrete is better than ordinary concrete. This kind of concrete made by the design of recircuit concrete mix with the component similar as cement raw meal ingredient can be fully reused but the environment effect is greatly reduced.The recircuit concrete is based on the idea of industrial ecological design.In the view of the whole best design of functionality and environment compatibility.lt changes the extensive resources utilization, wasting and designing it's wasted recircuit property in advance when primitive design is prepared,making the wasting process of concrete changes into the regeneration process of the raw material of cement .It's the specific practice of Ecological philosophy and System theory on cement and concrete industry The results given in this article are significant to value correctly and improve overall the environment impact of cement and concrete system in practical and theory.