Studying the Properties of Concrete by Replacing Part of Cement with Municipal Solid Waste Incinerated Ash

Abstract

Ultra-high performance concrete is a recent and important advancement in composite. It has a number of important properties, especially its high strength shows that the material will be beneficial for things which require less dead load, large spans, and even in areas which are prone to seismic activity, and it surpasses normal concrete. A very important and potential application for ultra high performance concrete is that it can be used for defence structures like in underground bunkers. The underground bunkers should be blast resistant which is a very important aspect. The materials should be ductile enough and able to absorb energy generated from a blast source and prevent the structures from collapsing. Ultra-high performance concrete can be very useful in this aspect as it has high strength, high ductility and high fracture energy. It has a very important use of blocking & stabilization of containment of nuclear waste. Trials were made by selecting binary combination of cementitious materials and their mix designs were verified by the EMMA software to get the maximum packing density. Poly Carboxylate ether was used as a high range water reducer and accordingly optimization of PCE was done. Samples were casted in form of cubes of size 7.04 x 7.04 x 7.04 cm3. Compression test were done at the end of 3 days of hot water curing and strength of 89.98 MPa was achieved. Incinerated ash of municipal solid waste accounts for a great portion of the matter in landfills, and minimization of resource consumption and recycling of waste are important factors for ensuring the future welfare of humankind. Hence the results of the treatment of the ash from a municipal solid waste incinerator (MSWI) by melting are described and studied. This MSWI fly ash slag was found to be comprised mainly of SiO2 and CaO, which can be substituted for up to 20% of the cement content in mortar, without sacrificing the quality of the resultant concrete. In fact, the concrete thus produced has greater compressive strength, 10% higher than that without the substitution. The aggregates retained on the 90 microns sieve were considered for investigation .The setting time of the fresh mortar becomes lengthens as increasing amounts of cement are replaced, while the spread flow value increases with the increasing percentage of cement substitution. According to the results of the toxic characteristic leaching procedure analysis, MSWI fly ash slag should be classified as general non-hazardous industrial waste that meets the effluent standard. Therefore, the reuse of MSWI fly ash slag is feasible, and will not result in pollution due to the leaching of heavy metals.