Physical and mechanical studies on binary blended Portland cements containing mordenite-rich tuff and limestone filler

Meriem Meziani,Ouali Amiri,Nordine Leklou,Nasser Chelouah

doi:10.1051/mattech/2019021

Abstract

In this research, we made physical and mechanical analyses thanks to which we deduced that the potential of replacing the Portland cement up to 20% by modernite-rich tuff (TM) and limestone filler (LF). The experimental procedure was done in two main stages. The first stage was dedicated to the pastes, including water requirement, setting time, hydration heat and free Ca(OH)2 content. In the second stage, mechanical and physical properties of mortars, water porosity and pore size distribution were studied. The final results show that LF mixtures closest to the control mixtures unlike the MT mixtures which exhibited a high water demand, less free Ca(OH)2, rapid appearance of the maximum thermal effect, an increase in the total and water accessible porosity, there is also a delay in improving of strength.

Highlights

The cement industry has been always among the largest sources of carbon dioxide (CO2) emission making up for 5– 7% of the CO2 emissions worldwide [1]
The setting time decreased when the water demand increased. This acceleration in final setting time can be attributed to the controlled diffusion which occurs during the pozzolanic reaction of Mordenite-rich Tuff (MT)
We show the potential advantages of replacing Portland cement up to 20% by mordenite-rich tuff and limestone filler in cementitious materials

Summary

Introduction

The cement industry has been always among the largest sources of carbon dioxide (CO2) emission making up for 5– 7% of the CO2 emissions worldwide [1]. Taking into consideration the environmental protection and the economical aspect, a large variety of supplementary cementitious materials (SCMs) are used. It is further reported that the demand for cement and concrete will increase from nearly 2 billion tons a year, nowadays to 5.8 billion tons by 2050 [4], much of which should be met through a combination of SCMs and clinker in order to meet environmental restrictions [5]. Since the production of by-products is not expected to increase, there is a great need to explore alternative SCMs to meet the increasing demand. Virtually endless, are some of promising sources of alternative SCMs such as limestone filler and natural pozzolans [5,6]

Objectives

Results

Conclusion