01025045

Component

Through an extensive experiment, the feasibility of using nondestructive testing (NDT) techniques for assessing the early age properties of Portland cement concrete was investigated. In this investigation, the laboratory tests on concrete specimens were carried out with the resonant frequency method and the field tests on concrete slabs with the seismic methods. The measured quantity with these methods is the dynamic modulus of elasticity or seismic modulus. In all instances, the maturity of the concrete as a function of curing time and temperature was measured. The maturity or seismic modulus or both of them were then related to the strength parameters and static modulus obtained from conventional testing on the same specimens. A database containing results from specimens made from a large number of different concrete mixes cured under different conditions has been established. Global relationships between the seismic modulus and the strength parameters as well as the static modulus are proposed on the basis of the type of coarse aggregates. With appropriate calibrations, such relationships can be readily used to estimate the early age properties of the concrete in structure and to determine the time required to open a repaired or newly constructed concrete pavement to traffic. Unlike a maturity-based relationship that is usually very specific to a particular mix under a particular curing condition, a seismic modulus-based relationship is mainly affected by the nature of the coarse aggregates and, to a lesser extent, by other parameters such as curing condition, admixture and water-cement ratio.

01020180

06-2725

English

24p

2006

Transportation Research Board 85th Annual Meeting

CD-ROM

Figures (13) ; References; Tables (1)

Admixtures; Concrete; Concrete curing; Dynamic modulus of elasticity; Nondestructive tests; Portland cement concrete; Resonance frequency

Dynamic modulus test; Early age concrete; Seismic modulus; Seismic test methods

Highways; Materials; I32: Concrete

Transportation Research Board Annual Meeting 2006 Paper #06-2725

TRIS, TRB

Mar 3 2006 11:06AM