00796892

Component

https://doi.org/10.3141/1698-06

http://scholar.google.com...taba&publication_year=2000

The short-term effects of pumping on concrete are well documented, although the long-term effects on concrete durability are not known. Pumping of concrete is widely used in large highway projects because of its convenience and economy of placement. Both types of effects were studied through collection and testing of 73 concrete samples from the Florida Department of Transportation (FDOT) bridge construction sites before and after pumping. The tests performed were air content, slump, unit weight, compressive strength, rapid chloride permeability, and water permeability. The air content and the slump of concrete decreased by about 1% and 13 mm (0.5 in.) on average, respectively, due to pumping. The unit weight and compressive strength of concrete increased by about 24 kg/cu m (1.5 pcf) and 1.83 MPa (255 psi), respectively, due to pumping. Pumping decreased the water and chloride ion permeabilities in the majority of tested samples. Results show that pumping does not have detrimental effects on concrete properties; in fact, in many cases, it results in stronger, denser, and more durable concrete. Results indicate that pumping can be continued with confidence as a means of concrete placement in FDOT projects.

This paper appears in Transportation Research Record No. 1698, Concrete 2000.

English

p. 36-44

2000

Transportation Research Record

030906676X

Figures (6) ; Photos (3) ; References (9) ; Tables (2)

Air content; Bridges; Compressive strength; Concrete placing; Construction; Durability; Permeability; Pumped concrete; Slump test; Weight

Bridges and other structures; Construction; Highways; Materials; I32: Concrete

TRIS, TRB, ATRI

Aug 3 2000 12:00AM

• 92-MPA AIR-ENTRAINED HIGH-PERFORMANCE CONCRETE USING TENNESSEE MATERIALS
• ACCELERATED ALKALI-SILICA REACTIVITY TESTING OF RECYCLED CONCRETE PAVEMENT
• DETECTING THE EXTENT OF CORROSION WITH ACOUSTIC EMISSION
• EARLY STRENGTH OF SELF-COMPACTING CONCRETE
• HIGH-PERFORMANCE CONCRETE IN THE RICHLANDS BRIDGE IN VIRGINIA
• MITIGATION OF ALKALI-SILICA REACTIVITY IN NEW MEXICO
• OPTIMIZATION OF AMOUNT AND BLENDING OF CEMENTITIOUS MATERIALS IN HIGH-PERFORMANCE CONCRETE
• THIN CONDUCTIVE CONCRETE OVERLAY FOR BRIDGE DECK DEICING AND ANTI-ICING