Utilizing high calcium fly ash in cementless precast concrete construction with emphasis on early mechanical strength

  • Pattanapong Topark-Ngarm College of Local Administration, Khon Kaen University
  • Prinya Chindaprasir Department of Civil Engineering, Faculty of Engineering, Khon Kaen University
Keywords: agricultural waste, industrial waste, early strength, geopolymer concrete

Abstract

Precast concrete has been proven to help speed up many construction projects. Using Portland cement in precast concrete is continuing to put CO2 emissions into the atmosphere from the production of Portland cement. Geopolymer concrete is produced from many types of agricultural and industrial waste in Thailand such as fly ash activated by alkaline solution; it is known as green concrete and can be used in precast concrete production and reduces the use of Portland cement. Geopolymer concrete produced from high calcium fly ash, sodium hydroxide and sodium silicate was used to study early strengths after it had been cured at 60°C for 24 hours. The average compressive strengths of all geopolymer concrete mixes after curing for 24 hours ranged from 29.68 to 38.48 MPa which were above the typical precast concrete release strength of 28 MPa. The average modulus of rupture was 120% higher than that calculated with the standard design code at the same compressive strength. The average bond strengths were in the range between 7.49 to 11.03 MPa.

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Published
2017-10-31
How to Cite
Topark-Ngarm, P., & Chindaprasir, P. (2017). Utilizing high calcium fly ash in cementless precast concrete construction with emphasis on early mechanical strength. Social Science Asia, 3(4), 97-110. Retrieved from https://socialscienceasia.nrct.go.th/index.php/SSAsia/article/view/32
Section
Research Article