Date of Publication

4-2014

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Chemical Engineering

Subject Categories

Chemical Engineering

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Thesis Adviser

Michael Angelo B. Promentilla

Defense Panel Chair

Luis F. Razon

Defense Panel Member

Cheryl Roxas
Laurence Gan Lim

Abstract/Summary

Pore structure, tortuosity and permeability are considered as key properties of porous materials such as cement pastes in understanding its durability. As such, image analysis techniques were used in this study to quantify pore size, effective porosity, tortuosity, and permeability from the microtomographic images of deteriorated pastes that were subjected to accelerated leaching. At a spatial resolution of 0.5 μm/voxel, the effective porosity (ϴe) was found to be in the ranges of 0.037 to 0.328. The characteristic pore size (d) using local thickness algorithm was found to be in the ranges of 1.406 to 3.589 microns. The geometric tortuosity (τ) based on random walk simulation in the percolating pore space was found to be in the ranges of 2.007 to 7.454. The permeability values (K) using NIST Permeability Stokes Solver ranges from magnitudes 10-14 to 10-17 m2. The results showed that as there is an increase in the effective porosity, geometric tortuosity decreases and water permeability increases. It is also observed that as the geometric tortuosity increases, the permeability decreases. These relationships are in agreement with previous reported literatures that use experimental and image analysis techniques. To model the relationship, the proposed mathematical model obtained is , with a correlation coefficient of 0.948.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTU017690

Shelf Location

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

Physical Description

1 computer optical disc ; 4 3/4 in.

Keywords

Lightweight concrete—Fracture; Concrete— Deterioration; Frost resistant concrete

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