US 12,391,614 B2
Method of pressure-pumping ready-mixed concrete
Masanari Takeda, Shizuoka (JP)
Assigned to TAKE CITE CO., LTD., Shizuoka (JP)
Filed by TAKE CITE CO., LTD., Shizuoka (JP)
Filed on Apr. 4, 2024, as Appl. No. 18/627,000.
Application 18/627,000 is a continuation of application No. 16/962,321, abandoned, previously published as PCT/JP2019/000615, filed on Jan. 11, 2019.
Claims priority of application No. 2018-004657 (JP), filed on Jan. 16, 2018.
Prior Publication US 2024/0270639 A1, Aug. 15, 2024
Int. Cl. C04B 14/28 (2006.01); B28C 7/16 (2006.01); C04B 14/26 (2006.01); C04B 16/02 (2006.01); C04B 18/24 (2006.01); C04B 111/00 (2006.01); E04G 21/04 (2006.01)
CPC C04B 14/28 (2013.01) [B28C 7/16 (2013.01); C04B 16/02 (2013.01); C04B 18/243 (2013.01); E04G 21/04 (2013.01); C04B 14/26 (2013.01); C04B 2111/00344 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of pressure-pumping a ready-mixed concrete, comprising:
pouring a preceding material for pumping into an outlet of a hopper connected to a pump,
subsequently, pouring the ready-mixed concrete into the outlet of the hopper over the preceding material,
pressure-pumping the preceding material and the ready-mixed concrete together towards a piping connected to an outlet of the pump, so that a lubricant layer comprising the preceding material is formed on an inner surface of a piping,
pressure-pumping a top end portion of the ready-mixed concrete so as to push a rear end of the preceding material inside the piping,
wherein the preceding material comprises calcium carbonate, cellulose nanofibers and erythorobic acid,
wherein the calcium carbonate comprises porous calcium carbonate, hydrotalcite-containing porous calcium carbonate, and sedimentary calcium carbonate,
wherein the porous calcium carbonate and the hydrotalcite-containing porous calcium carbonate are processed by treating the ready-mixed concrete sludge yielded in a ready-mixed concrete plant, for a particle size adjustment and an ingredient adjustment, and the sedimentary calcium carbonate has a uniform particle shape by chemical treatment, and
wherein an amount of the cellulose nanofibers is 0.005 wt % to 0.008 wt %.