Method for production of concrete precast elements particularly the railway sleepers

(10) WO 2021/023360 Al

(22) 06.08.2019

(43) 11.02.2021

(57) A method for production of concrete precast elements made of prestressed concrete, wherein concrete elements are formed of a concrete mixture containing 220 kg to 500 kg/m3 of sulphate-free cement having less than 0.5% by mass of sulphates (expressed as SO3) and an admixture of 0.2% - 4% by mass of cement of sodium or potassium carbonates or phosphates and 0.5% - 3% by mass of cement of lignosulphonates (advantageously sodium or potassium). The mixture may include also 5 - 8% of silica fume. Specific surface area of the cement may be higher than 3900 cm2 / g. The mixture with immersed prestressing steel bars undergoes thermal treatment at temperature of 69 - 98°C, preferably 80 - 85°C in a humid atmosphere for a time of 240 to 375 minutes.

(71) Applicant: PAWLUK, Jaroslaw Jerzy [PL/PL]; ul. Omankowskiej 11, 44-105 Gliwice (PL).

(84) Designated States (unless otherwise indicated, for every kind of regional protection available): 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, EE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM,

Related articles:

Issue 2021-04

Method for producing construction element

(10) WO 2021/001597 A1 (22) 24.06.2020 (43) 07.01.2021 (57) The present invention relates to methods for producing construction elements which outermost surfaces are coated with coating elements (101,...

more
Issue 2021-04

Method for manufacturing layered concrete parts

(11) EP 3 760 404 A1 (22) 03.07.2019 (43) 06.01.2021 Bulletin 2021/01 (57) Method for  layered concrete parts (1), comprising a)providing a first kind of concrete and a second kind of concrete...

more
Issue 2019-08

Methods for building precast concrete construction

(10) WO 2019/118563 A1 (22) 12.12.2018  (43) 20.06.2019 (57) A method of building a precast concrete construction includes lifting one or more precast elements from a trailer load to respective...

more
Issue 2019-02 New findings on the fatigue behavior of precast elements

Behavior of prestressed concrete girders

For prestressed precast concrete elements used in structures with predominantly cyclic loading, for example craneway girders in industrial structures or precast girders in bridge constructions, design...

more
Issue 2019-06

Method for joining two elements

(10) WO 2019/064250 Al (22) 28.09.2018 (43) (04.04.2019 (57) In a method for joining two elements (1, 2), such as reinforced concrete elements or steel elements, with each other along a vertical...

more