US 11,753,339 B2
High-strength concrete and preparation method thereof
Ke Wu, Jinan (CN); Tao Yang, Jinan (CN); Cao Wang, Jinan (CN); Guodong Li, Jinan (CN); Rong Chen, Jinan (CN); Jiahui Zhao, Jinan (CN); Dongxue Hao, Jinan (CN); Mingyue Ma, Jinan (CN); and Hongna Yang, Jinan (CN)
Assigned to Shandong University, Jinan (CN); China Power Construction Municipal Construction Group Co., Ltd, Tianjin (CN); Northeast Electric Power University, Jilin (CN); and Shandong Boshuo Geotechnical Engineering Design Consulting Co., Ltd, Jinan (CN)
Filed by Shandong University, Jinan (CN); China Power Construction Municipal Construction Group Co., Ltd, Tianjin (CN); Northeast Electric Power University, Jilin (CN); and Shandong Boshuo Geotechnical Engineering Design Consulting Co., Ltd, Jinan (CN)
Filed on Jan. 9, 2023, as Appl. No. 18/152,145.
Application 18/152,145 is a continuation of application No. PCT/CN2021/095049, filed on May 21, 2021.
Claims priority of application No. 202010770750.2 (CN), filed on Aug. 4, 2020.
Prior Publication US 2023/0159391 A1, May 25, 2023
Int. Cl. C04B 18/16 (2023.01); C04B 28/04 (2006.01); C04B 26/00 (2006.01)
CPC C04B 18/16 (2013.01) [C04B 26/006 (2013.01); C04B 28/04 (2013.01)] 2 Claims
 
1. A concrete comprising lignin, recycled fine powder, P.042.5 grade cement, water, sand, gravels with a particle size of 6 mm to 10 mm, and a polycarboxylic acid water reducing agent; wherein
a weight ratio of the cement, water, sand, gravels and the polycarboxylic acid water reducing agent in the concrete is 1:0.3:1.2:2.8:0.01;
a weight ratio of the lignin to the cement in the concrete is 0.1-0.3:20;
a weight ratio of the lignin to the recycled fine powder in the concrete is 0.1:5-10;
the recycled fine powder is recycled powder of discarded concrete, and is prepared by: separating solid waste of discarded buildings, removing impurity and crushing, and grinding into dust with a particle size of less than 0.16 mm by a ball mill;
the lignin is discarded wood lignin, which is extracted by: crushing wood, stirring and extracting with a sodium hydroxide aqueous solution with a mass concentration of 5% for 1 to 2 hours at 80° C. to obtain a black lignin alkali solution, adding a hydrochloric acid solution with a mass concentration of 30% into the black lignin alkali solution while stirring, reducing pH to 7.0, and obtaining the lignin by standing and layer separation;
and the concrete is made by a method comprising the following steps:
(1) pouring the lignin and the recycled fine powder into a portion of water to obtain a first uniformly mixed mixture,
(2) pouring the cement into the remaining water with a cement mixer to obtain a second uniformly mixed mixture,
(3) pouring the first uniformly mixed mixture into the second uniformly mixed mixture to obtain a third mixture, and then adding the polycarboxylic water reducing agent to the third mixture to obtain a uniformed mixed mixture A, and
(4) pouring the gravels and sand into the uniformly mixed mixture A for thoroughly stirring to obtain the concrete.