Title:
CEMENT ADDITIVE AND CEMENT COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2017/179122
Kind Code:
A1
Abstract:
Provided are a cement additive and a cement composition that make it possible to obtain the effects of maintaining the favorable fluidity of cement concrete and reducing autogeneous shrinkage in addition to achieving effects such as immediately effective and long-lasting hexavalent chromium reduction action. (1) A cement additive containing calcium sulfite that is a byproduct of the production of a lime-sulfur mixture. (2) The cement additive indicated in (1), wherein the pH is 9.0 or more. (3) The cement additive indicated in (1) or (2), wherein the oxidation-reduction potential (ORP) is 50 mv or less. (4) One of the cement additives indicated in (1) to (3), wherein the MgO content is 0.5% or more. (5) A cement composition containing cement and one of the cement additives indicated in (1) to (4). (6) The cement composition indicated in (5), wherein 0.05-2 parts of the cement additive are added to 100 parts of cement. (7) The cement composition indicated in (5) or (6), wherein the cement is Portland cement.
Inventors:
USHIRO MASATAKA (JP)
MORIOKA MINORU (JP)
HARA HIROFUMI (JP)
WATANABE MASAAKI (JP)
YASHIMA HIROYUKI (JP)
MORIOKA MINORU (JP)
HARA HIROFUMI (JP)
WATANABE MASAAKI (JP)
YASHIMA HIROYUKI (JP)
Application Number:
PCT/JP2016/061809
Publication Date:
October 19, 2017
Filing Date:
April 12, 2016
Export Citation:
Assignee:
DENKA COMPANY LTD (JP)
International Classes:
C04B22/14; C04B28/02
Foreign References:
| JP2008174436A | 2008-07-31 | |||
| JPS55129211A | 1980-10-06 |
Attorney, Agent or Firm:
SENMYO, Kenji et al. (JP)
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