TITLE:
Physico-Mechanical Properties of an Eco-Friendly Compressed Recycled Brick Dust Mortars Based Grog Stabilized Eggshell and Coconut Shell Powder: Effects of Curing Time and Correlations
AUTHORS:
Luc Arnold Liyong, Lekuna Duna Linda, Tchuifon Donald Raoul Tchuifon, Cyrille Ghislain Fotsop, Zangue Henriette Adjia, Jean Luc Nsouandele
KEYWORDS:
Coconut Shell, Curing Time, Eggshell, Grog, Linear Correlation, Physico-Mechanical Properties
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.16 No.1,
March
31,
2026
ABSTRACT: This work aims to investigate the effect of curing time on the Physico-mechanical Properties of an Eco-friendly Compressed Earth Mortars based Grog stabilized with Eggshell and Coconut shell powder at 28, 56 and 90 days for sustainable construction. Samples were cured at room temperature (23˚C ± 3˚C) to obtain a mix of percentages of coconut shell and calcined eggshell as 0.13, 0.26 and 0.4 (wt.%), respectively. The mix design of coconut shell and calcined eggshell were incorporated into the grog powder. The physico-mechanical properties (Moisture content, Water absorption, Apparent porosity, Bulk density, Elastic modulus, Compressive strength) were evaluated. Chemical analysis was investigated to establish the effective stability of samples. Results at 28 and 90 days showed an increase in compressive strength with increasing percentages of coconut shell from 1.52 to 3.01, 2.01 to 4.26, 1.34 to 3.42 MPa, respectively, and calcined eggshell, from 1.38 to 1.87, 2.70 to 4.61, 3.88 to 4.14 MPa, respectively. Bulk density decreases with increasing percentages of coconut shell, calcined eggshell and the percentage of grog decrease. A perfect correlation of
R
1
2
= 0.96 and
R
2
2
= 0.99 were obtained, which revealed a significant effect at different curing time thus suitable for sustainable eco construction.