WO2019151485 (A1)

Cement composition and cured object obtained therefrom

(22) 01.02.2019

(43) 08.08.2019

(57) The present invention relates to a cement composition which comprises a cement, cellulose nanofibers, and water, wherein the mass ratio of the water to the cement is 0.4 or less. Preferred as the cement is Portland cement. It is preferable that the Portland cement be high-early-strength Portland cement and that the mass ratio of a fine aggregate to the high-early-strength Portland cement be 2.0 or less. It is preferable that the amount of the cellulose nanofibers in the cement composition per unit volume be 0.1-15 kg/m3. The present invention further relates to a cured object obtained from the cement composition, the cement composition giving a cured object sample aged in water and a cured object sample aged in air, the ratio of the splitting tensile strength of the latter sample as measured at a material age of 91 days in accordance with JIS-A-1113 (2006) to that of the former sample as measured likewise being 0.90-1.10.

(71) Daio Seishi KK (JP); Sumitomo Mitsui Construction Co Ltd (JP)

Related articles:

Issue 2018-6 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...

US 2019/0218143 A1

Methods for producing fiber cement products with fiber cement waste

(22) 05.10.2017 (43) 18.07.2019 (57) The present invention relates to methods for the production of fresh cured fiber cement products. More particularly, the present invention provides methods for...

Issue 2019-1-2 HRP20181382 (T1)

Ultra-fast setting cement based on amorphous calcium aluminate

(22) 28.08.2018 (43) 19.10.2018 (57) Summary of the corresponding patent WO2015173525 (A1): The invention relates to an ultra-fast setting cement composition comprising at least amorphous calcium...

Issue 2019-4 WO2019026674 (A1)

Cement admixture, cement composition and production method therefor

(22) 23.07.2018 (43) 07.02.2019 (57) Provided are a cement admixture and a cement composition, which, in a cement concrete cured body, have excellent anti-rust effects on an internal rebar, have...

Issue 2019-1-2 US 2018/0273429 A1

Gypsum-cement dry mix and prefabricated construction parts produced therefrom

(22) 29.09.2016 (45) 27.09.2018 (57) The invention relates to a gypsum-cement dry mix, the use thereof and a method for producing prefabricated construction parts using the gypsum-cement dry mix. For...