00727338

Component

https://doi.org/10.3141/1532-11

http://scholar.google.com...wski&publication_year=1996

The water-cement ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-cement ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-cement ratio in the field. A prototype device has been developed to measure the water-cement ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-cement ratio of fresh concrete with an accuracy of +/-0.01 on the water-cement ratio scale for a single test at a 90% confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accurate determination of water-cement ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.

This paper appears in Transportation Research Record No. 1532, Advancements in Concrete Materials Technology.

English

p. 73-79

1996

Transportation Research Record

0309059046

Figures (12) ; References (8) ; Tables (2)

Accuracy; Concrete; Concrete construction; Costs; Equipment; Field tests; Fresh concrete; Measuring instruments; Prototypes; Quality control; Statistical analysis; Strength of materials; Turbidity; Water cement ratio

Concrete strength; Field measurements

Bridges and other structures; Construction; Data and Information Technology; Finance; Highways; Materials; I32: Concrete; I50: Construction and Supervision of Construction

TRIS, TRB

Oct 22 1996 12:00AM

• DEVELOPING HIGH-PERFORMANCE CONCRETE MIX FOR NEW YORK STATE BRIDGE DECKS
• EFFECT OF AGGREGATE CONTAMINATION ON CONCRETE PAVEMENT DURABILITY
• EFFECT OF PUMPING ON AIR CHARACTERISTICS OF CONVENTIONAL CONCRETE
• HIGH DOSAGE TYPE-C FLY ASH AND LIMESTONE IN SAND-GRAVEL CONCRETE
• IMPACT OF CONCRETE PLACING METHOD ON AIR CONTENT, AIR-VOID SYSTEM PARAMETERS, AND FREEZE-THAW DURABILITY
• MECHANICAL PROPERTIES OF CONCRETE WITH GROUND WASTE TIRE RUBBER
• NEURAL NETWORK INTERPRETATION OF ULTRASONIC RESPONSE FOR CONCRETE CONDITION ASSESSMENT
• PERMEABILITY OF CONCRETE SUBJECTED TO CYCLIC LOADING
• PROPERTIES OF POLYMERIC FIBER-REINFORCED CONCRETE
• SYNTHETIC FIBER-REINFORCED CONCRETE BRIDGE DECKS: REDEFINING BRIDGE DECK DESIGN AND BEHAVIOR
• ULTRA-THIN, FIBER-REINFORCED CONCRETE OVERLAYS FOR URBAN INTERSECTIONS