Masters Theses

Abstract

“Seeking an eco-friendly concrete, researchers have conducted studies to fully replace ordinary Portland cement (OPC) with fly ash (FA) producing alkali-activated concrete (AAC). Results showed better performance of AAC in terms of high early compressive strength, and durability compared to conventional concrete. However, much is still unknown about the behavior of AAC. From the type of materials used, the curing procedure, and long-term strength development of these binders; a thorough investigation is needed in order to fill the existing gap from previous studies and thus make a step forward to the safely use of AAC in the construction industry. The present thesis reports results of studies conducted on class C fly ash-based alkali-activated mortars (AACFA). A study was conducted on two-part AACFA mortars subjected to a rest time of 2, 6, 12, 24, 30, or 36 hours; then, cured under ambient curing, and heat curing regimes (oven, and steam) for 9 hours at two different temperatures of 55 ̊C and 80 ̊C. The temporal evolution of the compressive strength at ages of 1, 7, 28, 56, and 90 days was also determined. In addition, in an attempt to produce a user-friendly material similar to OPC, one-part AACFA mortars were synthesized and their behaviors were compared to those of the two-part mortars. It was observed that two-part mortars exhibited better fresh and hardened properties than one-part mortars. For two-part AACFA mortars, a rest time of 12 hours increased the short term strength by approximately 45%, while a considerable change in the long term strength occurred up to 56 days and 90 days depending on the chemical composition of the FA”--Abstract, page iv.

Advisor(s)

ElGawady, Mohamed

Committee Member(s)

Myers, John J.
Kumar, Aditya

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2019

Journal article titles appearing in thesis/dissertation

  • Effects of rest time and curing regime on short and long-term strength of class C fly ash-based alkali activated mortar
  • A comparison between one-part and two-part mixing of class C fly ash-based alkali-activated mortars

Pagination

xiv, 98 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2019 Cedric Chani Kashosi, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 12023

Electronic OCLC #

1313117352

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