Experimental Investigations of Partial Replacement of OPC with PFA and GGBS in cement mortar

Abdullah Bin Quraya,Dhiya Al-Jumeily,Abbas Al-Ameeri,Anas Y Al-Hayawi,Jamila Mustafina,Ali Shubbar,Raad Hashim,David Yeboah

doi:10.1088/1757-899x/1058/1/012004

Abstract

Production of cement has been identified as a major source of carbon dioxide, particulates, and other gases, where it was reported that the production of one ton of OPC could produce one ton of CO2. These gases and particulates exert significant effects on human health and the environment. Therefore, the supplementary cementitious materials (SCMs) are becoming sustainable concrete in comparison with ordinary Portland cement (OPC) by decreasing the consumption of cement and carbon dioxide emissions. This experimental study is to focus on the effect of partial replacement in cement by pulverized fly ash (PFA) and ground granulated blast furnace slag (GGBS). Four mixes were used with different values of PFA and GGBS and they tested at 1, 2, and 4 weeks. The compressive strength of these specimens was carried out by a compression test. The test results revealed that increasing the ratios of PFA and GGBS replacement results in a decrease in the compressive strength of specimens. The decrease in compressive strength of SCMs mortar ranged from 20 to 30%, and they could be an acceptable value.

Highlights

In today’s world, concrete plays a vital role in the construction industry, and the most important ingredient of the concrete is ordinary Portland cement (OPC) [1, 2]
The results of the compressive strength tests of cement mortar with partial replacement of pulverized fly ash (PFA) and ground granulated blast furnace slag (GGBS) at various percentages at different curing periods are presented in Tables (1) and Figures 1 and
At 1 week of curing, the reduction of compressive strength for the three mixes in comparison with the first mix was 10%, 44%, and 50 % respectively (Figure 2). It can be noticed, for example, that using 50% a partial replacement material dropped the compressive strength of mortar by around half at 1 week, but this ratio decreased to be 20% at 28 curings. This means that PFA and GGBS are inactive material at an early age and they need time to interact with the components of a cement

Summary

Introduction

In today’s world, concrete plays a vital role in the construction industry, and the most important ingredient of the concrete is ordinary Portland cement (OPC) [1, 2]. It is estimated that producing one ton of OPC could produce one ton of CO2 These gases and particulates caused severe changes in the average weather temperature, and the climate in general, where it has been proved that the produced gases from the cement industry contribute to climate change and global warming. The latter phenomena threaten public health through maximining water pollution [8,9,10,11,12], and the lack of rain in some parts of the world [13,14,15,16]. The negative impacts of the cement and concrete industries on the public health and the environment, efficient management plans along with expressive wastewater treatments, such as filtration [22,23,24,25,26], combined methods [27,28,29,30], coagulation [31,32,33,34,35,36,37,38,39,40], and electro-chemical methods [41,42,43,44,45,46] and disposal options [47,48,49]

Objectives

Results

Conclusion