Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Kayyali, A."'
Autor:
O. A. Kayyali, M.N. Haque
Publikováno v:
Magazine of Concrete Research. 47:235-242
Chloride-contaminated concretes were produced either by admixing sodium chloride with original mixes or as a result of exposure to external sodium chloride solutions. Free chloride and hydroxyl ion concentrations in the pore solutions of the concrete
Autor:
Stephen R. Yeomans, O.A. Kayyali
Publikováno v:
Construction and Building Materials. 9:219-226
Concrete beams reinforced with black, epoxy coated or galvanized steel were tested to failure in flexure and the slip of the reinforcement was monitored. While there was clear evidence of the influence of bar deformations on the bond capacity of beam
Autor:
O.A. Kayyali, M.N. Haque
Publikováno v:
Cement and Concrete Research. 25:531-542
Two methods were used to determine the ‘free’ and ‘water soluble’ chloride ions concentration in four differing strength grade concretes. Each grade of concrete had varying concentration of Cl− admixed as NaCl. In all 24 different batches o
Autor:
M. Sh. Qasrawi, O.A. Kayyali
Publikováno v:
Journal of Materials in Civil Engineering. 4:16-26
The capacity to bind chloride ions in hydrated cement paste, with and witout fly ash, is studied. Free chloride ions remaining in the pore solution are determined. The hardened pastes are exposed to continuous fog curing, moderate or CO\d2 polluted e
Publikováno v:
Journal of Materials in Civil Engineering. 3:113-124
Chlorides as CaCl2 and NaCl were added in differing dosages to mixes of portland cement and fly ash‐portland cement mortars. Cylindrical mortar specimens were sealed and cured in a fog room for periods varying from one to 28 weeks. Expressed pore s
Autor:
M.N. Haque, O. A. Kayyali
Publikováno v:
Journal of Materials in Civil Engineering. 2:24-34
The concentration of free hydroxyl ions in pore solutions of mortars is studied, and the effects of hot environment on these ions are reported. The influence of fly‐ash addition is observed and discussed. Fog curing decreases free OH- ions in cemen
Autor:
O.A. Kayyali, M.N. Haque
Publikováno v:
ACI Materials Journal. 92
Two methods were employed to determine the "free" and "water-soluble" chloride ion concentrations in concretes of differing strength that were exposed to penetrating sodium chloride solutions of 5,000, 10,000, and 20,000 ppm Cl ion concentration. The
Autor:
O.A. Kayyali
Publikováno v:
Cement and Concrete Research. 13:575-579
Publikováno v:
Cement and Concrete Research. 18:763-773
The influence of an Australian flyash on Cl− and OH− ion concentration of cement mortar pore solutions was investigated by preparing NaCl and CaCl2-bearing mortars with 30% replacement of cement with flyash, and analyzing the pore solutions extra
Autor:
M.N. Haque, O.A. Kayyali
Publikováno v:
Cement and Concrete Research. 18:895-900
Hardened Portland cement paste samples were immersed in sodium chloride solution. Their pore solution was expressed and analysed for Cl − and OH − ions concentrations. The development of free Cl − and of Cl − /OH − ratio is discussed in rel