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Thermal and Mechanical Characteristics of Mortars Produced with a Binder Containing Two Ashes of Cow Dung and Industrial Fly Ash

Author(s):

Ernesto Cabral HOUEHANOU , Laboratory of materials and Structures (LAMS), Cotonou, Benin National University of Sciences, Technologies, Engineering and Mathematics (UNSTIM), Benin ; Armand A. DJOSSOU, National University of Sciences, Technologies, Engineering and Mathematics (UNSTIM), Benin ; Aristide C. HOUNGAN, National University of Sciences, Technologies, Engineering and Mathematics (UNSTIM), Benin ; Ezechiel I. ALLOBA, National University of Sciences, Technologies, Engineering and Mathematics (UNSTIM), Benin ; Antoine VIANOU, Laboratory of Thermophysical Characterization of Materials and Energy Appropriation (Labo-CTMAE) of the Polytechnic School of Abomey-Calavi (EPAC), 01 BP 2009, Cotonou (Benin)

Keywords:

Cow dung ash, fly ash, thermal conductivity, thermal resistance, compressive strength

Abstract

This work is a comparative study of thermal and mechanical behavior of 04 different mortars including a reference mortar made from commercial binder (Portland cement CEMII / A-LL 42.5 R) and sand, three other mortars made from industrial fly ash (based on bituminous coal), ash obtained by incineration of cow dung in laboratory and ash obtained by artisanal incineration of cow dung. In order to better appreciate the influence of ashes incorporation in mortars, various assays were carried out : 0 %, 5 %, 10 %, 15 %, 20 % and 25 % of each ash. Thermal conductivity and resistance of mortars were measured with FOX200 device, in accordance with ASTM C518-04 (Standard Test Method for Steady-State Thermal Transmission Properties by Heat Flow Meter Apparatus). Compressive strength of mortars was determined with Tecno Test device, in accordance with NF EN 12390-01 standard. The results obtained showed that thermal conductivity and resistance vary from 0.6132 W.m^(-1).K^(-1) to 0.3782 W.m^(-1).K^(-1) respectively, and from 0.0498 m^2.K.W^(-1) to 0.0877 m^2.K.W^(-1). Thermal conductivity decreases and thermal resistance increases as ash content increases. In addition, the lowest thermal conductivity and therefore the highest thermal resistance were obtained with bituminous coal ash mortar. It is also observed that thermal resistance of cow dung ash mortars are very close between 0 and 5 % of ash, but beyond 5 %, thermal resistance of artisanal ash mortar is greater than that of mortar based on laboratory ash. Mechanical results showed that mortars compressive strengths of 28 day and 90 day decrease as the ash content increases. Compressive strength varies from 24.35 MPa to 35.56 MPa at 28 days, and 29.65 MPa to 37.89 MPa at 90 days. Highest compressive strength was obtained with reference mortar, and the lowest with artisanal ash mortar.

Other Details

Paper ID: IJSRDV6I100024
Published in: Volume : 6, Issue : 10
Publication Date: 01/01/2019
Page(s): 109-114

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