Foundry Dust - Cement-based Composites And Applied Research

With the development of economy and industry in our country.the dumping and collection of waste powder are very large. Waste powder not only covers many arrable lands, but also pollute the environment seriously so that it has become a great burden for economy, society and environment. This paper is to systematically discuss physical and chemical property, harm, the hygiene standard, dumping standard, and to introduce the advantages of cement-based composite, also to introduce the principle and compatibility of grain-strengthened composite.In this paper, wastes powder is used as thin framework material in concrete and made use of waste powder as much as possible under the condition that meet the demand of using. In experiment, several prescriptions are designed. Boiling water is adopted to accelerate hardening in order to assess the strength of sample earlier, and at last a viable and economic prescription is gained. Based on the optimized prescription, how to affect the property of cement-based composite by raw materials, technological condition, additives, etc, is studied. At the same time, concerned properties of sample are tested, and micro surface property is analyzed by use of SEM. Finally the optimized prescription is used to make road brick.The resulting optimized prescription of waste powder addition is: 15%(fly ash),25%(used sand powder from the first vehicle manufactory). Experimental results show that the adequate prescription is: for surface material, cement: sand: water=l: 1.5: 0.3; for bottom material, cement: fly ash: used sand powder: shattered stone=18: 15: 25: 42, and the addition of water in bottom material is appropriate. The properties of product made of this prescription are: tensile strength resistance, 30.4 MPa; deflecting strength resistance, 4.1 MPa; density, 1880 kg s/m3; rate of water containing,3.7%; rate of water absorbing, 11.1%.Compared with normal road brick, this product has the advantages of great usage of waste, low producing cost, etc. Waste powder is used as bottom material of road brick to make product, which is a way of dealing waste powder. This way not only save resources, but also decrease the pollution of powder to environment ,and have high economic and social profit.