Efffect of varying curing period on the compressive strength of rice husk ash based geopolymer composite

Date

6-2016

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Nimfa Maren S. Tabucal

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The cement industry leaves a large ecological footprint by using significant amount of natural resources such as calcium carbonate, silica, alumina, and iron ore. Today, as the demand for concrete continuously increase, innovations such as geopolymer materials are being studied. Geopolymer materials utilize the reaction of an alkaline liquid with a source material that is rich in silica and alumina producing the binder in a geopolymer material instead of cement. With this, geopolymer materials can replace concrete in the future, This study investigated the effect of varying curing period on the compressive strength of rice husk ask (RHA) based geopolymer composite. The geopolymer composite is composed of RHA, fine and coarse aggregates, sodium hydroxide, sodium silicate, and water. Three sets of specimens with the same mix proportion of RHA to activator ratio of 0.35 were cured for 7 days, 14 days, and 28 days respectively. The compressive strength of the specimens was obtained in accordance with ASTM C39 Standard Test Method for COmpressive Strength of Cylindrical Concrete Specimen. The average compressive strength obtained were 0.461 MPa, 0.341 MPa, and 0.197 MPa for specimens cured at 7 days, 14 days, and 28 days. It can be composites decrease as the curing period increases. With the low values of compressive strength obtained, it can be concluded that the geopolymer composite with RHA to activator ratio of 0.35 is not for structural purposes. A complete chemical analysis of the RHA is recommended to further determine the compatibility of the RHA with the alkali activators. Moreover, the curing period can be extended up to 90 days to fully determine the relationship between the compressive strength and the curing period.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2016 E63 D59

Document Type

Thesis

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