Author(s):
T.R. Jones, T.J. Hirsch
Publication Date
August 1961
Abstract
This portion of the study reported herein was undertaken in order to obtain a better understanding of the physical properties of concrete at an early age. The data presented in this report includes the strength, shrinkage, coefficient of expansion and contraction, and tensile deformation properties of concrete from 12 hours of age to 28 days of age. This research was planned to provide information on hardening and strength increase in concrete pavements or structures during early ages. It was intended, also, to provide information from which stresses could be determined in pavements or structures due to length changes occasioned by shrinkage and temperature changes at different ages. In addition, the data should indicate the ability of the concrete to sustain such length changes which may occur at different ages. This information was desired because most of the problems associated with the design and proper functional performance of concrete structures and pavements can be traced directly to the physical properties of the concrete. It is hoped that the information in this report will help engineers to more accurately predict the behavior of concrete and also to exercise better control in designing mixes and in writing specification to produce the desired properties at the desired time.|Two types of aggregate were used in the concrete mixes; a crushed limestone from the Texas Crushed Stone quarry, near Georgetown, Texas, and a siliceous-calcareous gravel and sand from the Brazos River deposit near Hearne, Texas. Other variables in the concrete batches were cement content, air content, and four different admixes. Specimens were taken from each batch design so that the compressive strength, modulus of rupture, tensile strength, bond strength, modulus of elasticity, ultimate tensile strain, extensibility, and coefficient of expansion and contraction could be determined at 12 hours, 1 day, 2 days, 7 days, and 28 days of age. Shrinkage specimens were also cast, and initial measurements were made when the concrete became hard enough to hold the gage points securely; i. e., usually 12 hours or 24 hours of age.
Report Number:
RP-19(01)
Keywords:
Concrete Properties, Early
Link(s):
Document/Product
http://tti.tamu.edu/documents/RP-19-01.pdf
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