A Low Temperature Manufactured Portland Cement Clinker from Pulverized Waste of Fly Ash

Hassan Hassanien Mohamed Darweesh

doi:10.11648/j.ijmsa.20200902.12

Abstract

The possibility to produce both environmentally and friendly cement exclusively or solely from industrial byproducts such as pulverized fly ash (PFa) was investigated. A low clinkering temperature was attained or acquired to produce cement. It is capable to gain high early and late strength on hydration. The optimum quantities of PFa and clinkering temperature were detected. The results indicated that the higher the clinkering temperature, the higher hydration reactivity of the cement. The optimum PFa content and clinkering temperature for synthesizing cement were found to be 35 wt. % and 1350°C, respectively. The production of cement with PFa at a low clinkering temperature can save energy and natural resources consumption, landfills disposal cost and also can reduce CO<sub>2</sub>↑ emission. The formed major phases in presence of PFa are more or less the same as those of the blank as experimentally achieved and approved by the compressive strength. As the PFa content increased, the free lime contents decreased, and also the firing or clinkering temperature decreased. The optimum PFa content must not exceed than 35 wt. %, and any further increase of Pfa resulted in adverse effects on all characteristics of the produced clinker.

Highlights

It is well known that the production of Portland cement is very expensive and the current study aims to determine whether pulverized fly ash (PFa) can be utilized as a component in the raw meal for the production of Portland cement clinker or not
Due to ASTM C618-05, 2005 [27], which is based on the sum of SiO2, Al2O3 and Fe2O3, the used PFa can be classified as a high calcium Fa
By its chemical composition of Fa sample is similar to The raw materials are clay (TCY) to a large extent, so it could be successfully used as a raw component in the raw meal during the manufacture of Portland cement clinker

Summary

Introduction

The pulverized fly ash (PFa) from coal combustion that fired in the thermal power plants is one of such solid wastes. PFa is a fine powder that is mainly composed of spherical glassy particles of silica and depending upon the types of boiler and coal, siliceous, silico-calcareous and calcareous fly ashes with pozzolanic reactivity are produced [1,2,3]. Fly ash may be used for other purposes such as traditional ceramics, glass ceramics [4], as the material for land consolidation in road construction [4,5,6,7,8], land stabilization in mining areas [6], sorbents for the flue gas desulphurization [7], a filling material in making various products [8], and synthesis of zeolites [6,7,8,9,10]

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Conclusion