Matrix shrinkage reducing agent for bridge pier tower column in complex environment and preparation method of matrix shrinkage reducing agent
By using matrix shrinkage agent combined with saturated alcohol monomer and cyclic ether monomer in concrete, the problem of concrete shrinkage in complex environments along the Sichuan-Tibet Railway was solved, and efficient and economical concrete engineering results were achieved.
Patent Information
- Application Number
- CN202510041373.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-05-23
AI Technical Summary
In the complex environment along the Sichuan-Tibet Railway, concrete materials have prominent problems in early and long-term shrinkage, and existing expansion agents and shrinkage agents have difficulty in regulation, poor applicability and impact on concrete strength in actual applications.
A matrix reducing agent composed of saturated alcohol monomer A and simple cyclic ether monomer B is prepared by radical polymerization technology, and the amount molar ratio of monomer A and monomer B is controlled to be between 1.0:2.5 and 3.5.
Effectively reduce concrete shrinkage, significantly improve the overall durability and safety of concrete projects, and is suitable for the construction of bridge pier tower columns in complex environments, reducing construction costs and improving construction efficiency.
Smart Images
Figure CN120025536A_ABST
Abstract
Claims
1. A matrix shrinkage reducing agent for bridge piers and towers in complex environments, characterized by: The matrix shrinkage reducing agent is compounded by monomer A and monomer B; The molar ratio of the monomer A to the monomer B is 1.0:2.5-3.5; The monomer A is a saturated alcohol monomer, and the monomer B is a simple cyclic ether.
2. The matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 1, characterized in that: The molar ratio of the monomer A to the monomer B is 1.0:3.
0.
3. The matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 1, characterized in that: The monomer A is one of the following compounds: methanol, butanol, and dodecanol.
4. The matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 1, characterized in that: The monomer B is one of the following compounds: ethylene oxide, propylene oxide, and butylene oxide.
5. A method for preparing a matrix shrinkage reducing agent for bridge piers and towers in complex environments, characterized in that: The method comprises the following steps: Add 100 mol of distilled water and monomer B into a four-necked flask, raise the temperature to 80°C and start stirring; The free radical polymerization initiator and 100 mol of water are prepared into solution a; Monomer A, the free radical polymerization initiator and 100 mol of water are prepared into solution b; Solution a and solution b are added dropwise into the reaction container using two droppers within 3 hours. After the addition is completed, the mixture is kept at 60°C for 3 hours to obtain a matrix shrinkage reducing agent. The monomer A is a saturated alcohol monomer, and the monomer B is a simple cyclic ether; the molar ratio of the monomer A to the monomer B is 1.0:2.5-3.
5.
6. The method for preparing a matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 5, characterized in that: The method further comprises: before the polymerization test, flushing the four-necked flask with nitrogen to ensure that the sealing between the stirring rod and the flask is good.
7. The method for preparing a matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 5, characterized in that: The free radical polymerization initiator is azobisisobutyl cyanide.
8. The method for preparing a matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 5, characterized in that: The preparation process of the monomer A is as follows: A mixture of 1 mol of the initiator and the catalyst sodium is sucked into the reactor by vacuum, and high-purity nitrogen is flushed into the reactor. After vacuuming, nitrogen is flushed again, and the nitrogen is repeatedly replaced 2 to 3 times to make the air content in the reactor lower than the specified explosion limit and the volume fraction of nitrogen greater than 60%; The reactor was heated to 150°C and n-butanol was added dropwise to control the reaction temperature within the range of 120-130°C and the reactor pressure below 0.4 MPa.
9. The method for preparing a matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 5, characterized in that: The preparation process of the monomer B is as follows: A mixture of 1 mol of the initiator and the catalyst sodium is sucked into the reactor by vacuum, and high-purity nitrogen is flushed into the reactor. After vacuuming, nitrogen is flushed again, and the nitrogen is repeatedly replaced 2 to 3 times to make the air content in the reactor lower than the specified explosion limit and the volume fraction of nitrogen greater than 60%; The reactor was heated to 150°C and ethylene oxide was added dropwise to control the reaction temperature within the range of 120-130°C and the reactor pressure below 0.4 MPa.
10. The method for preparing a matrix shrinkage reducing agent for bridge piers and towers in complex environments according to claim 8 or 9, characterized in that: The initiator is an unsaturated alcohol, and the initiator includes any one of vinyl alcohol, allyl alcohol, methylallyl alcohol, butenol, methylbutenol, pentenol, methylpentenol, ethylpentenol, hexenol, methylhexenol, and ethylhexenyl alcohol.