Effect pf Gypsu on the compressive strenght of cement
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Date
2011
Authors
Sanjeewa, K. B. K.
Journal Title
Journal ISSN
Volume Title
Publisher
University of Peradeniya
Abstract
Gypsum (CaSO₄2H₂0) has been ground into cement in small percentage (0 - 10%) to regulate its setting time. It prevents flash setting and makes the concrete workable for hours. The gypsum influences not only the setting but also other properties of cement such as grindability, sensitivity to storage, volume stability and strength.
Experimental investigation was conducted on strength variation of Cement for different gypsum amounts. For this purpose, a number of experiments were performed on several cement samples of Ordinary Portland Cement (OPC) and Portland Limestone Cement (PLC) manufactured from same clinker.
Cement mortar for compressive strength was prepared and tested as per SLS ISO 679: 2008. Percentage of gypsum (as SO₃) and other chemical compound present in the cements were determined by using X-ray fluorescence (XRF) analysis. In addition, phase formation of cement and hydrated cement was studied by using X-ray powder diffraction (XRD) analysis.
he average values of test results obtained in this research were recorded and analysed. The experimental results show that the strength varies with the increment of gypsum. It was revealed that the optimum SO; content for OPC is about 1.7 % and for PLC is about 1.6 %.
Description
Keywords
Physics , Gypsum , Cement , XRD analysis