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Title: Compressive strength-maturity relationships of mortar containing fly ash
Authors: Ragan, Steven A.
Keywords: Cement
Fly ash
Mortar additives
Mortar strength
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-84-13.
Description: Miscellaneous Paper
Abstract: The relationships between the compressive strength and maturity of four mortar mixtures containing fly ash were evaluated. The maturity of the mortar was determined using both the traditional maturity method proposed by Saul and the maturity-age procedure proposed by Freisleben-Hansen and Pedersen. Two mortar mixtures had 25 percent of the cement by absolute volume replaced with Class F fly ash, and two mixtures had 35 percent by the cement of absolute volume replaced with Class F fly ash. Twenty-four compressive strength specimens and three temperature monitoring specimens were fabricated from each batch and cured at the temperature of interest. The curing temperatures investigated included 40°, 73°, and 85° F, and a daily fluctuating temperature ranging from 40° to 80° F. The temperature-age history of the specimens was monitored continuously and compressive strength tests were conducted at various ages up to 28 days. Both the classical maturity method proposed by Saul and the maturity-age procedure proposed by Freisleben-Hansen and Pedersen estimated the compressive strength of the test specimens with a degree of success. The maturity-age procedure resulted in less scatter about the regression lines than the classical method for mortar cured at 85° F and 40°-80° F. Less scatter of the classical maturity data was noted for mortar cured at 40° F. Additional research is needed to determine if the maturity-age method for estimating compressive strength can be extended from mortar specimens to concrete test specimens and then to concrete in place in a structure.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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