Strength properties of road base materials blended with waste limestones

Date of Publication

3-2012

Document Type

Master's Thesis

Degree Name

Master of Science in Civil Engineering

Subject Categories

Structural Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

Jonathan R. Dungca

Defense Panel Chair

Ronaldo S. Gallardo

Defense Panel Member

Alexis M. Fillone
Mary Ann Q. Adajar

Abstract/Summary

Road construction is one of the mostly developed infrastructures in the Philippines considering that it is the common inland transport in the country. Important factors that give quality to the road’s performance are the underlying soil layers of the road known as the subgrade, subbase and base. These soil layers play vital roles in the structural stability of the roads. However, it was noticed that there are constraints in the availability of the suitable materials making the construction costly. Most of the materials found in the site are substandard. This problem paved the opportunity to find potential use of waste limestones as blend to the conventional road base materials. The geotechnical properties of conventional road base materials blended with limestone at different proportions have been established, including specific gravities, particle size analyses, Atterberg limits, index densities, compaction characteristics, California bearing ratio (CBR) and unconfined compressive strength (UCS). In addition, Scanning Electon Microsocopy (SEM) photomicrographs were generated illustrating the micro fabric of the materials. Moreover, X-ray Diffraction (XRD) Analyses were obtained indicating the presence of minerals in the materials. The additional iv characterizations made from the SEM and XRD analyses helped in thoroughly examining the strength behavior of the controlled and blended mixtures. As a result, analysis showed correlations of limestone content to the index properties and strength characteristics of the materials. The results confirmed that the optimum strength can be produced at 50% blend of limestone which increased the unsoaked CBR, soaked CBR and UCS values up to 30%, 100% and 40%, respectively.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG005123

Shelf Location

Archives, The Learning Commons, 12F Henry Sy, Sr. Hall

Keywords

Roads—Base courses; Roads—Foundations; Limestone

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Embargo Period

9-12-2023

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