Title: Engineering Properties of Cement Paste with Fly Ash Substitution and Addition of Alkaline Activator
Abstract: This study investigated engineering properties of blended paste using class F fly ash as partial replacement of cement with addition of sodium silicate as partial replacement of mixing water. Experimental variables water-binder ratio of 0.3, four different fly ash substitutions (0, 10, 30, and 50%), and three different amount of sodium silicate (0, 5, and 10%) were observed. Fresh properties including workability and setting time, and hardened properties including compressive strength and drying shrinkage were examined through this study. From the experimental results, fly ash improved the engineering properties of paste with fly ash substitution up to 30%. At early age, the strength decreased with the increase of fly ash substitutions due to the low hydration rate from the fly ash. With the increase of age, the strength paste specimens increased about 20% with the fly ash replacement up to 30% compared with those of the control specimen at the age of 56 days. However, the application of sodium silicate reduced the engineering properties. It can be concluded that the presence of sodium silicate did not activate the pozzolanic reaction of fly ash as expected.
Publication Year: 2020
Publication Date: 2020-12-22
Language: en
Type: book-chapter
Indexed In: ['crossref']
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