Durability of steel embedded in structural lightweight concrete
Tóm tắt
Interim results of a long-term investigation on the durability of steel reinforcement embedded in expanded slate structural lightweight concrete are reported. The influence of concrete cover, cement content and of partial replacement of lightweight fines with natural sand was studied. Surface crazing was found to increase with cement content and increasing fine particles. The carbonation depth, and the relative permeability measured by alcohol absorption, were found to decrease with increasing cement content. Inclusion of natural sand in the mix reduced the permeability and the penetration of the carbonation front into the concrete. No instance of damage due to corsosion was found in embedded steel reinforcement after two year's exposure to industrial atmosphere.
Tài liệu tham khảo
Kinnersly, P.—Aggregates: the coming crisis. New Civil Engineer, 5th April. 1973, pp. 5–13.
Grimer, F. J.—The durability of steel embedded in lightweight concrete. Concrete, Vol. 1, April. 1967, pp. 125–131.
Short, A.—The use of lightweight concrete for reinforced concrete construction. Reinforced concrete Review, Vol. 5, September 1959, pp. 141–188.
Broms, B. B.—Crack width and crack spacing in reinforced concrete members. J. Am. Conc. Inst. Proc., Vol. 62, Oct. 1965, pp. 1237–1255.
Mazor, J. D., Bianchini, A. C., andKesler, C. E.—Corrosion of reinforcing bars in concrete. J. Am. Conc. Inst. Proc. Vol. 62, August 1965, pp. 909–932.
British Standards Institution, BS: 3797,Specification for lightweight aggregates for concrete, London, 1964. p. 8.
British Standards Institution, BS 882 & 1201,Specification for aggregates from natural sources for concrete. London, 1965, p. 22.
Maule, A. W.—Private communication.
Nesbit, J. K.—Structural lightweight-aggregate concrete, Concrete Publication Limited, p. 280.
British Standards Institution, CP 110: 1972,The structural use of concrete. Part 1, design, materials and workmanship, London, p. 154.
Everett, L. H.—Steel in concrete with blast furnace slag aggregate. Mag. of Concrete Research, Vol. 19, No. 59, June 1967, pp. 83–94.
Schulze, W., Günzler, J.—Corrosion protection of the reinforcement in lightweight concrete. Proc. of the Fist International Congress on Lightweight Concrete, Vol. 1, May, 1968, pp. 111–122.