CEMENT ADDITIVE AND CEMENT COMPOSITION

WIPO Patent Application WO/2017/179121

A1

Provided are a cement additive and a cement composition that maintain the favorable fluidity of cement concrete, that reduce autogeneous shrinkage, and that exhibit an immediately effective and long-lasting hexavalent chromium reduction effect. (1) A cement additive that comprises a lime-sulfur mixture having a pH of 10 or more and that has an excellent ability to maintain the fluidity of cement concrete and reduce autogeneous shrinkage. (2) The cement additive indicated in (1), wherein the lime-sulfur mixture has an oxidation-reduction potential (ORP) of -450 mv or less. (3) The cement additive indicated in (1) or (2), wherein the lime-sulfur mixture contains 5-10% of Ca in terms of T-Ca, 15-30% of S in terms of T-S, and 0.5-2.0% of Mg in terms of MgO. (4) A cement composition containing cement and one of the cement additives indicated in (1) to (3). (5) The cement composition indicated in (4), wherein the cement additive content is 0.005-1 part with respect to 100 parts of cement. (6) The cement composition indicated in (4) or (5), wherein the cement contains Portland cement.

USHIRO MASATAKA (JP)
MORIOKA MINORU (JP)
HARA HIROFUMI (JP)
WATANABE MASAAKI (JP)

PCT/JP2016/061808

October 19, 2017

April 12, 2016

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DENKA COMPANY LTD (JP)

C04B22/14; C04B28/02

JP2001342461A	2001-12-14
JPS61249586A	1986-11-06
US4193811A	1980-03-18
JPH10231227A	1998-09-02
JP2007204302A	2007-08-16

KAGAKU DAIJITEN 5, 15 April 1961 (1961-04-15), pages 333

SENMYO, Kenji et al. (JP)

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