Permeability of high-strength concrete containing low cement factor

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Energy Engineering

DOI:https://doi.org/10.1061/(ASCE)0733-9402(1996)122:1(21)· OSTI ID:218576

Naik, T R; Singh, S S; Hossain, M M ^[1]

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1. Univ. of Wisconsin, Milwaukee, WI (United States)

Coal-burning powerplants generate about 72,000,000 t (80,000,000 ton) of combustion by-products per year in the US. Each ton (1.1 ton) of by-products used in lieu of portland cement in concrete saves about 7,600,000 kJ (7,150,000 Btu) of energy, and prevents 1 t (1.1 ton) of CO{sub 2} released in the air due to avoided cement manufacture. This specific project was directed toward studying the influence of ASTM Class C fly ash on concrete permeability. A plain portland cement concrete mixture was proportioned to have a 28-day compressive strength of 40 MPa. Concrete mixtures were also proportioned to have cement replacement with Class C fly ash in the range of 0--70% by weight. Each concrete mixture was tested for compressive strength, air permeability, water permeability, and chloride ion permeability. Air and water permeabilities were evaluated by using the Figg method. Chloride ion permeability was measured in accordance with ASTM C 1202. Air permeability of plain portland cement concrete was lower than that for concrete containing fly ash at the age of 14 and 28 d. At the age of 91 d, the 55% fly ash mixture exhibited the highest resistance to air permeability. All the concrete mixtures showed fair resistance to water permeability at ages up to about 40 d. The maximum resistance to water permeability was observed for the 35% fly ash mixture at ages of 28 and 91 d. At the 2 month age, chloride ion permeability of all mixtures except the 74% fly ash mixture were rated as moderate to very low in accordance with ASTM C 1202 criteria. When duration of curing was increased to three months, the fly ash concrete mixtures with fly ash to cementitious materials in the range of 18--55% showed lower chloride ion permeability than the concrete without fly ash. The same trend was observed at the age of 1 yr.

• Sponsoring Organization: USDOE
• OSTI ID: 218576
• Journal Information: Journal of Energy Engineering, Journal Name: Journal of Energy Engineering Journal Issue: 1 Vol. 122; ISSN JLEED9; ISSN 0733-9402
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
AGE DEPENDENCE
AIR
CHLORIDES
COAL
COMBUSTION
COMPRESSION STRENGTH
CONCRETES
DIFFUSION
FLY ASH
FOSSIL-FUEL POWER PLANTS
PERMEABILITY
WASTE MANAGEMENT
WASTE PRODUCT UTILIZATION
WATER