The influence of fly ash on obtaining quality plastic and hardened properties of portland cement concrete

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6859121

Mohamad, A B

An experimental test burn was done substituting coal with Refuse-Derived-Fuel(RDF) consisting mainly of waste paper and plastic with heating value of 6000 to 8000 BTU/lb. Twelve test burn days were run with 4 days of 5% RDF and 8 days of 10% RDF. The effect of RDF on the chemical and physical properties of fly ash and the effect of coal-RDF fly ash on the properties of plastic and hardened concrete were investigated. Coal fly ash from Merrimack Power Station was classified as an ASTM class F complying to the chemical and physical properties of ASTM C-618 specifications. Coal-RDF fly ash produced during the test burn showed chemical and physical properties comparable to coal fly ash. The average chemical and physical properties of coal-RDF fly ash complied to ASTM C-618 specifications. Concrete made with coal fly ash and coal-RDF fly ash showed increased slump in high paste mixes and decreased slump in low paste mixes. Air content decreased with increased fly ash at a constant dosage of air entrainment. Compressive strength the fly ash concrete at and beyond 28 days were comparable to ordinary portland cement concrete. Heavy metals were not leached from coal fly ash and coal-RDF fly ash concrete during a column test using a synthetic acid rain of pH 4.5 even though small quantities of cadmium and lead were found to leach from coal fly ash and coal-RDF fly ash during the beginning of the test. The volume of the acid rain was approximately equivalent to 7 years of precipitation, assuming 36 inches of rain per year. A microscopic investigation comparing the structure of pastes made with coal fly ash, coal-RDF fly ash, incinerator fly ash and incinerator bottom ash was conducted.

• Research Organization: New Hampshire Univ., Durham, NH (USA)
• OSTI ID: 6859121
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
010800* -- Coal
Lignite
& Peat-- Waste Management
09 BIOMASS FUELS
091000 -- Biomass Fuels-- Properties & Composition-- (1990-)
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
ACID RAIN
AEROSOL WASTES
ASHES
ATMOSPHERIC PRECIPITATIONS
BUILDING MATERIALS
CADMIUM
CALORIFIC VALUE
CARBONACEOUS MATERIALS
CEMENTS
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
COAL
COCOMBUSTION
COMBUSTION
COMBUSTION PROPERTIES
COMPARATIVE EVALUATIONS
COMPRESSION STRENGTH
CONCRETES
DISSOLUTION
ELEMENTS
ENERGY SOURCES
FEDERAL REGION I
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
INCINERATORS
LEACHING
LEAD
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
NEW HAMPSHIRE
NORTH AMERICA
OXIDATION
PAPER
PETROCHEMICALS
PETROLEUM PRODUCTS
PH VALUE
PHYSICAL PROPERTIES
PLASTICS
POROSITY
PORTLAND CEMENT
POWER PLANTS
QUANTITY RATIO
RAIN
REFUSE DERIVED FUELS
REFUSE-FUELED POWER PLANTS
RESIDUES
SEPARATION PROCESSES
SIMULATION
SYNTHETIC MATERIALS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
USA
WASTE PRODUCT UTILIZATION
WASTES