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Research Article
ScienceAsia 26 (2000) : 237-241 |doi: 10.2306/scienceasia1513-1874.2000.26.237
Strength Evaluation of
Aggregate Made from Fly Ash
Somnuk Tangtermsirikula,* and Anil C Wijeyewickremab
ABSTRACT: This paper is aimed to propose a strength estimation method for fly ash aggregate. The pellet
strength is useful for predicting compressive strength of the concrete using the fly ash aggregate. By
adopting the equation for a spherical solid under point load, the tensile strength of fly ash aggregate was
derived from the simple point load test. Then the equation for estimating 30-day tensile strength of the
fly ash aggregate produced from fly ashes with different chemical composition was proposed as a function
of equivalent CaO content of the raw materials ie fly ash and cement. Since the strength of the fly ash
aggregate increases with age, the maturity concept was introduced to compute the time-dependent
tensile strength of the fly ash aggregate pellet based on the 30-day tensile strength equation. It was
found that the tensile strength of the fly ash aggregate was higher when the equivalent CaO content of
the raw materials used to produce the fly ash aggregate increased and the time-dependent tensile strength
of the fly ash aggregate from ages 14 to 91 days could be fairly estimated from the maturity of the
aggregate based on the 30-day tensile strength. This study will be useful as a tool for manufacturing and
quality control of the fly ash aggregate.
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a Department of Civil Engineering and Environmental Technology, Sirindhorn International Institute
of Technology, Thammasat University, Patumthani, Thailand.
b School of Civil Engineering, Asian Institute of Technology, Patumthani, Thailand.
* Corresponding author
Received 26 Sep 1999, Accepted 8 Aug 2000
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