HARDENING ACCELERATOR FOR CEMENT CONTAINING INCINERATION ASH OF SEWERAGE SLUDGE AND CEMENT COMPOSITION

摘要

PPROBLEM TO BE SOLVED: To provide a hardening accelerator for cement with the incineration ash of sewerage sludge added in which the increase of the unit water content of the cement is suppressed, and the reduction of the initial and long term strength of the cement is improved, and to provide a cement composition. PSOLUTION: The hardening accelerator for cement containing the incineration ash of sewerage sludge essentially consists of quicklime and/or slaked lime. The cement composition is obtained by blending the incineration ash of sewerage sludge in 10 to 50 pts. and a quicklime and/or slaked lime-containing material in 1 to 15 pts. by an amount expressed in terms of free lime (f-CaO) (the total of the content of the f-CaO content and a value obtained by converting Ca(OH)SB2/SBinto an f-CaO content) to 100 pts. of cement. PCOPYRIGHT: (C)2003,JPO