Date of Publication

12-14-2022

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering with specialization in Geotechnical Engineering

Subject Categories

Civil Engineering | Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Advisor

Mary Ann Q. Adajar

Defense Panel Chair

Jonathan R. Dungca

Defense Panel Member

Erica Elise S. Uy
Joenel G. Galupino

Abstract/Summary

Dolomite byproducts are waste spillages obtained from nearby areas in its mining site in Cebu, Philippines. The transportation of this material has destroyed corals in its neighboring water body. There is also a concern about the volume of these wastes in the mining site which prompted the researchers to conduct a study that aims to identify the geotechnical characteristics of the dolomite byproducts and to assess its suitability as an alternative construction material for road construction. Laboratory tests following ASTM standards were conducted on the sample to determine its microfabric structure, chemical composition, particle distribution, plasticity, void ratio, relative density, compaction behavior, and hydraulic conductivity. Test results showed that the dolomite byproduct is a well-graded sand with silt and has low plasticity. The microstructure of the dolomite byproduct shows that its particles range from small to large sizes, have minimal to no voids, and angular blocky in shape with sharp angles that go in random directions. The dominant elemental compositions are Oxygen and Carbon together with Calcium, Nitrogen, a very small amount of Magnesium and traces of Iron. The low percentage of calcium and magnesium in the dolomite byproducts proves that the sample obtained from the mining site is of “low-grade” quality. The presence of Carbon and Oxygen suggests that the dolomite byproducts as a construction material could influence soil stability and may serve as a hydrator or accelerator for concrete. Its compaction behavior was assessed and bearing ratio values vii were obtained for different conditions to which the sample could be subjected for construction purposes. The dolomite byproducts have an anticipated embankment performance of good to excellent based on the AASHTO Classification System while it has a value of reasonably stable when dense to very stable based on the USCS. The load bearing capacity as described by the CBR values ranges from 14.33% to 16.80% with a general rating of fair to good as subgrade material. Hydraulic conductivity test was performed with samples at void ratio taken four different relative compactions; 60%, 70%, 80%, and 90%, in consideration of the possible relative compaction on site. The hydraulic conductivity of the dolomite by-products ranges from 0.0417 cm/sec to 0.0187 cm/sec which can be described as a medium degree of permeability. An analytical model to predict the hydraulic conductivity as a function of void ratio was also generated. The study concluded that dolomite byproducts have the potential as an embankment material and have a fair-to-good rating for subbase use in road pavements. The load-bearing capacity of the sample can also be considered competent to withstand deflection under traffic loading conditions.

Abstract Format

html

Language

English

Format

Electronic

Keywords

Dolomite—Philippines—Cebu; Waste products as building materials—Philippines—Cebu

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Embargo Period

12-14-2022

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