Effect of rice husk ash particle size on the workability, setting time and hardness of rice husk ash geopolymer concrete

Date

12-2015

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

Rice husk ash (RHA) is a by-product which can be used as a substitute or replacement to cement. This study investigated the effect of RHA particle size on the workability, setting time and hardness of geopolymer concrete. RHA together with alkali activators like NaOH and Na₂SiO₃ forms a binder. This binder, combined with the aggregates would create the geopolymer concrete. Amorphous RHA burned at approximately 740°C was sieved no. 100, 200 and 325. Control batch used type 1 Portland cement and water-to-cement ratio of 0.5. For geopolymer concrete, a water-to-binder ratio of 0.5 was used.Alkali activators used were sodium hydroxide (NaOH) and sodium silicate ( Na₂SiO₃) and at a ratio of 2.5. Concrete mixes undergone slump testing and were then casted to 4x4x4 in³ steel molds. All samples were subjected to ambient setting until all the samples have set. After setting, physical properties were notified and samples were subjected to drop-weight test. Results showed that RHA passing at 100 sieve cannot be used as a binder for geopolymer concrete. RHA passing at 325 showed the most promising results which have a setting time of 4 days and failed at two drops of the drop-weight test. The study concluded that as the particle size of RHA gets smaller, it made the setting time shorter but made the concrete harder. Although, in terms of workability, it did not made the geopolymer mix workable.

Language

English

Location

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

Call Number

LG 993.5 2015 E63 /H47

Document Type

Thesis

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