|
|
|
Title: INVESTIGATION OF CRITICAL QUALITY ASSURANCE PARAMETER VARIATIONS FOR CONCRETE
Accession Number: 00743108
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: The Indiana Department of Transportation is involved in preparing statistically sound specifications for strong and durable concrete used in quality assurance programs. Previous laboratory studies relating concrete strength to air content and concrete mix designs dealt with variation in compressive strength. This study searched for a statistically sound relationship between air content, concrete mix designs, and flexural strength. This study also developed a high-pressure method of hardened concrete air content determination. Sixty-four independent batches (combinations) of concrete were produced. Each batch was subjected to a total of 24 tests--4 plastic and 20 hardened. The design factors were aggregate type and gradation, plastic air content, cement and pozzolanic content and testing operator. After plastic testing, three flexural strength beams were cast from each batch of concrete. The experimental design response variables consisted of flexural, compressive, and split tensile strength along with pulse velocity. Analysis of variances, indicated that the optimum flexural strength could be obtained using as-received stone coarse aggregate and an air content of between 6% and 7.9%, with no fly ash. A high-pressure air meter, similar to the meter developed by the Army Corps of Engineers, was used. A strong statistical correlation of determination, r-squared=0.94, was obtained between plastic and the hardened concrete air content using this meter.
Supplemental Notes: This paper appears in Transportation Research Record No. 1575, Construction: Flexible Pavements, Bridges, Quality, and Management.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Smutzer, R KGulen, SBelew, Y KAnderson, V LPagination: p. 92-101
Publication Date: 1997
Serial: ISBN: 0301061601
Features: Figures
(4)
; References
(5)
; Tables
(6)
TRT Terms:
Aggregate gradation; Air content; Analysis of variance; Cement content; Compressive strength; Concrete hardening; Concrete pavements; Concrete tests; Construction; Flexural strength; Mix design; Paving; Polymer concrete; Pulses; Quality assurance; Specifications; State departments of transportation; Tensile strength; Velocity
Uncontrolled Terms: Geographic Terms: Old TRIS Terms: Subject Areas: Construction; Data and Information Technology; Highways; Materials; I32: Concrete; I52: Construction of Pavements and Surfacings
Files: TRIS, TRB, ATRI
Created Date: Nov 13 1997 12:00AM
More Articles from this Serial Issue:
|
