Details:

Creators:
Tia, Mang ; Muszynski, Larry ; Kwon, Ohhoon
Tia, Mang ; Muszynski, Larry ; Kwon, Ohhoon Less -
Corporate Creators:
University of Florida. Dept. of Civil and Coastal Engineering
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Compressive Strength Concrete Concrete Curing Laboratory Studies Mathematical Prediction Moisture Content Slabs Test Procedures
Publication/ Report Number:
BDK75-977-62 ; 98299
BDK75-977-62 ; 98299 Less -
Resource Type:
Tech Report
Geographical Coverage:
Florida
Corporate Publisher:
Florida. Dept. of Transportation
Abstract:
This study investigated the use of maturity method to determine early age strength of concrete in slab

replacement application. Specific objectives were (1) to evaluate effects of various factors on the compressive

maturity-strength relationship of concrete at early age, (2) to develop appropriate test procedures for applying

maturity method to predict early age strength of concrete, and (3) to validate the accuracy of the prediction of

maturity method using the proposed test procedures.

The maturity method using the Arrhenius maturity function was found to be quite reliable and convenient for use

in predicting the early-age compressive strength of concrete in replacement slab application. Some limitations of

maturity-strength prediction, such as the strength loss due to high curing temperature and insufficient moisture,

supply were observed in the laboratory studies. However, these limitations were observed at the later age of the

concrete when the compressive strength reached around 3,000 to 3,500 psi, and thus the observed limitations did not

have any negative effect on the early-age-strength prediction of the concrete in the replacement slab.

Using the strength of the protection specimens as strength determination of the in-place concrete is unreliable and

may result in over-prediction of its strength. The maturity method using the Arrhenius maturity function is

recommended for use to estimate the early-age compressive strength of concrete in slab replacement application. A

testing protocol for the generation of maturity-strength curve for prediction of early-age compressive strength of

concrete was recommended. The concrete used in the replacement lab must have exactly the same water-cement

ratio, mix ingredients, and fresh concrete properties as those of the laboratory concrete used to develop the maturity

curve. In the event that differences in fresh concrete properties, with more than ±1 inch in slump and/or ±1 % in air

contents, are observed between the actual concrete used at the project site and the concrete which has been used to

develop the maturity-strength curve, the maturity-strength curve should not be used to make strength predictions

without proper adjustments of the predicted strengths due to effects of the variations in the fresh concrete properties.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:efbc1d9046e6f144eead7556278284b974e4611568f04a807d60ea23678216bf
Download URL:
https://rosap.ntl.bts.gov/view/dot/27236/dot_27236_DS1.pdf
File Type:

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