Date of Publication

1-10-2024

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering with Specialization in Structural Engineering

Subject Categories

Civil Engineering | Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Advisor

Dr. Bernardo A. Lejano

Engr. Kenneth Jae T. Elevado

Defense Panel Chair

Dr. Lessandro Estelito O. Garciano

Defense Panel Member

Engr. Richard M. De Jesus

Engr. Marion Ryan A. Vicencio

Abstract/Summary

There is a growing interest in exploring the viability of wastes from the agriculture industry as a potential substitute for concrete parts. The study explores these wastes as potential replacement for concrete by using coconut shell ash (CSA) and coconut shell granules (CSG) as partial replacement for cement and fine concrete aggregates, respectively. Coconut coir (CC) is used as fiber reinforcements to utilize more coconut waste. The experiment involved 15 mix designs with changing percentages of CSA and CSG (0% to 20%) and CC (0% to 2% by cement weight). Tests for fresh concrete included slump and unit weight, while 28-day cured samples were tested for tensile and compressive strength. Response Surface Methodology (RSM) was used to model the relationship between factors and responses and find the best mix design. The modified concrete showed a decrease in slump for fresh concrete. The recommended combination for optimal strength was 2% CC content, achieving a compressive strength of 23.046 MPa and tensile strength of 3.315 MPa. This suggests that CSGCSA coconut coir reinforced concrete is suitable for structures not requiring compressive strength above 28 MPa. The microscopic bonding of aggregates was assessed using Scanning Electron Microscope (SEM), revealing that including CC prevented the continuation of the interfacial transition zone.

Abstract Format

html

Language

English

Format

Electronic

Keywords

Sustainable construction—Philippines; Waste products as building materials—Philippines

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Embargo Period

8-2025

Available for download on Friday, August 01, 2025

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