Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Correlation Studies of Fundamental Aggregate Properties with Freeze-Thaw Durability of Structural Lightweight Concrete
The scope of the study was to correlate durability of structural light-weight concrete with (a) type of lightweight coarse aggregate, (b) cement factor and (c) freeze-thaw durability of selected concretes. Also determine if types of lightweight aggregate could be described according to fundamental properties. This included absorption bulk specific gravity, dry unit weight, sieve analysis, petrographic analysis, X-ray diffraction pattern and resistance to freeze-thaw. Concrete specimens were subjected to rapid freezing in air and thawing in water. Also the compressive and splitting tensile strengths were determined. The results of tests on five lightweight aggregates and the concretes suggest the following conclusions: (1) Wide differences were found in the engineering properties; (2) Lightweight aggregates are composed largely of porous glass in amorphous form; (3) Wide variation exists in pore size, pore spacing, and extent of crystallinity; (4) Type of lightweight aggregate influenced the resistance to freezing and thawing of non-air-entrained concrete; (5) No correlation was obtained between aggregate absorption and concrete durability. Further research is recommended.
Correlation Studies of Fundamental Aggregate Properties with Freeze-Thaw Durability of Structural Lightweight Concrete
The scope of the study was to correlate durability of structural light-weight concrete with (a) type of lightweight coarse aggregate, (b) cement factor and (c) freeze-thaw durability of selected concretes. Also determine if types of lightweight aggregate could be described according to fundamental properties. This included absorption bulk specific gravity, dry unit weight, sieve analysis, petrographic analysis, X-ray diffraction pattern and resistance to freeze-thaw. Concrete specimens were subjected to rapid freezing in air and thawing in water. Also the compressive and splitting tensile strengths were determined. The results of tests on five lightweight aggregates and the concretes suggest the following conclusions: (1) Wide differences were found in the engineering properties; (2) Lightweight aggregates are composed largely of porous glass in amorphous form; (3) Wide variation exists in pore size, pore spacing, and extent of crystallinity; (4) Type of lightweight aggregate influenced the resistance to freezing and thawing of non-air-entrained concrete; (5) No correlation was obtained between aggregate absorption and concrete durability. Further research is recommended.
Correlation Studies of Fundamental Aggregate Properties with Freeze-Thaw Durability of Structural Lightweight Concrete
W. B. Ledbetter (Autor:in)
1965
16 pages
Report
Keine Angabe
Englisch
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