Mechanical and Structural Characteristics of Cement Mortars Blended with Locust Bean Pod Ash

Authors

  • Timothy Denen Akpenpuun Department of Agricultural and Bio-systems Engineering, University of Ilorin, Ilorin
  • Banjo Akinyemi Landmark University, Omu-Aran, Kwara State
  • Olamide Olawale Department of Agricultural and Bio-systems Engineering, Landmark University Omuaran
  • Oluwasegun Joshua Aladegboye
  • Olalere Israel Adesina Department of Agricultural and Bio-systems Engineering, University of Ilorin, Ilorin

Keywords:

compressive, strength, agro-waste, pod, ash

Abstract

This study looks at the effect of cement replacement with locust bean pod ash (LBPA) as a supplementary cementitious material on compressive strength of mortars. The fresh properties (workability, initial and final setting times), compressive strength at 7, 14, 21 and 28 days and microstructural analysis (SEM, EDS and XRD) were evaluated. LBPA were considered at replacement levels of 0, 10, 15, 20 and 30% of cement mass for preparation of the mortar samples. Workability of the cement mortars reduced as the content of LBPA increases while initial and final setting times increased in relation to increase in LBPA content in the matrix. An increase of about 79% in compressive strength at 7 days, 100% at 14 days, 147% at 21 days and 136% at 28 days were recorded with LBPA content of 15% LBPA being the optimum level when compared to control mix. Maximum compressive strength ranged between 38.3 and 65MPa after 7 to 28 days curing. Microstructural analysis revealed less voids and pores, and the presence of dense CSH gels which helped to maintain the optimum compressive strength at 15% LBPA cement replacement level of the mortar.

Author Biographies

Timothy Denen Akpenpuun, Department of Agricultural and Bio-systems Engineering, University of Ilorin, Ilorin

Department of Agricultural and Bio-systems Engineering, University of Ilorin, Ilorin /  Lecturer I

Banjo Akinyemi, Landmark University, Omu-Aran, Kwara State

Department of Agricultural and Biosystems Engineering /Lecture I

Olamide Olawale, Department of Agricultural and Bio-systems Engineering, Landmark University Omuaran

Department of Chemical Engineering / Senior Lecturer

Oluwasegun Joshua Aladegboye

Department of Agricultural and Bio-systems Engineering / Lecturer I

Olalere Israel Adesina, Department of Agricultural and Bio-systems Engineering, University of Ilorin, Ilorin

Department of Agricultural and Bio-systems Engineering

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Published

2019-12-16

Issue

Section

II-Farm Buildings and Construction