Effect of temperature on the setting time and hardening 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

Alkali-activated geopolymer concrete is an emerging technology that aims to completely replace ordinary Portland cement-based concrete. By utilizing waste from burnt rice hulls instead of ordinary Portland cement, the negative impacts of cement production to the environment can be reduced. To utilize rice husk ash as a binder for concrete, it is activated using sodium hydroxide and sodium silicate solutions. This study was limited to determining the effect of temperature on setting and hardening of rice husk ash geopolymer concrete. The lack of a standard mix proportion procedure for geopolymer concrete limits this study to the complete replacement of cement in the standard mix proportion of concrete with rice husk ash. Both 75 μm and 45 mμ were used to make the geopolymer concrete samples. The setting time at elevated temperatures of 60°C, 80°C, and 100°C was tested. A modified drop-weight impact test was used to determine the hardness of the geopolymer concrete samples after setting. For both particle size, a setting temperature of 100 °C produced the hardest geopolymer concrete sample after 20 hours, developing the first crack after 1 blow for 75 μm RHA, and 2 blows for 45 μm RHA. Geopolymer concrete samples made with 75 μm RHA failed after 3 blows, while those made with 45 μm RHA failed after 5 blows.

Language

English

Location

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

Call Number

LG 993.5 2015 E63 /P37

Document Type

Thesis

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