Regulating cementitious material for promoting hydration of Portland cement

Patent metadata

Field	Value
Publication number	US-11858848-B2
Application number	US-202117485790-A
Country	US
Kind code	B2
Filing date	Sep 27, 2021
Priority date	Jul 17, 2021
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A regulating cementitious material for promoting hydration of Portland cement is provided. The regulating cementitious material may include ingredients by weight as follows: ye'elimite, 27˜68 parts; anhydrite, 29˜68 parts; lithium nitrite, 2˜5 parts; ethylene glycol monoisopropanolamine, 0.14˜0.29 parts; triethanolamine acetate, 0.04˜0.09 parts; and polyglycerol, 0.04˜0.09 parts. An early strength of Portland cement can be improved through a cooperative hydration between minerals and an enhanced solubilization of a complexing agent.

First claim

What is claimed is:

1. A regulating cementitious material for promoting hydration of Portland cement, comprising ingredients in parts by weight as follows:
ye'elimite, 27˜68 parts;
anhydrite, 29˜68 parts;
lithium nitrite, 2˜5 parts;
ethylene glycol monoisopropanolamine, 0.14˜0.29 parts;
triethanolamine acetate, 0.04˜0.09 parts; and
polyglycerol, 0.04˜0.09 parts;
wherein the ingredients in total are 100 parts by weight.

2. The regulating cementitious material according to claim 1 , wherein the ye'elimite is prepared by:
mixing powders of calcium carbonate (CaCO 3 ), aluminum trioxide (Al2O3) and calcium sulfate (C S H2) according to a molar ratio of CaCO3:Al2O3:C S H2=3:3:1 to obtain a powder mixture,
adding a powder of ye'elimite of 5% by weight of the powder mixture into the powder mixture as crystalline seeds,
then sequentially mixing evenly, compacting, and calcining by raising a temperature to 1350° C. in 2 hours (h) and then keeping the temperature for 2 h,
afterwards, cooling to a room temperature in 1 minute (min), and grinding until all passing through 200 mesh sieve;
wherein a purity of the ye'elimite is greater than 97.5%.

3. The regulating cementitious material according to claim 1 , wherein the anhydrite is prepared by keeping an anhydrite at 200° C. for 2 h in a high-temperature furnace.

4. The regulating cementitious material according to claim 1 , wherein a molar ratio of the anhydrite to the ye'elimite is 11.

5. An application of the regulating cementitious material according to claim 1 in promoting hydration of Portland cement, wherein an addition amount of the regulating cementitious material is 10% by weight of the Portland cement.

6. A cement comprising: Portland cement and the regulating cementitious material according to claim 1 ; wherein an amount of the regulating cementitious material is 10% by weight of the Portland cement.

Assignees

• Univ Beijing Technology

Inventors

• Lan Mingzhang
• Pei Tianrui
• Wang Jianfeng
• Yang Junjian
• Chen Zhifeng
• Cui Suping
• Wang Yali

Classifications

• C04B28/065 Primary

  Calcium aluminosulfate cements, e.g. cements hydrating into ettringite · CPC title

• C04B24/023

  Ethers · CPC title

• C04B24/122

  Hydroxy amines · CPC title

• C04B24/123

  Amino-carboxylic acids · CPC title

• C04B28/14 Primary

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title