WO 2017/179121 A1

Cement additive and cement composition

(22) 12.04.2016

(43) 19.10.2017

(57) 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.

(71) Denka Company Limited, Tokyo (JP)

(84) ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)

Related articles:

4/2018 WO2018025431 (A1)

Cement additive and cement composition

(22) 22.02.2017 (43) 08.02.2018 (57) The purpose of the invention is to provide a cement additive and a cement composition which have excellent solution stability, achieve a good fluidity holding...

more
6/2018 WO 2018/056124 A1

Additive for cement composition and cement composition

(22) 12.09.2017 (43) 29.03.2018 (57) The present invention is an additive for a cement composition, said additive containing a powdered cellulose, and addressing the problem of providing an additive...

more
3/2017 WO 2017/006995 A1

Cement additive, cement composition, raw material for cement additive

(22) 07.07.2016 (43) 12.01.2017 (57) Provided is a cement additive which can significantly improve strength of a cured product of a cement composition for a prolonged period of time. Also provided is...

more
10/2016 US 2016/0221872 A1

Cement kiln fuel treatment

(22) 29.01.2016 (43) 04.08.2016 (57) A method of treating cement kiln fuel includes introducing an additive to a fuel component to form a fuel mixture. The fuel component includes a sulfur-generating...

more
1-2/2018 EP3250661 (A1)

Cement kiln fuel treatment

(22) 29.01.2016 (43) 06.12.2017 (57) Summary of the corresponding patent WO2016123524 (A1): A method of treating cement kiln fuel includes introducing an additive to a fuel component to form a fuel...

more