Unlock instant, AI-driven research and patent intelligence for your innovation.

Polymer of fatty alcohol polyethenoxy ether class, and application as economization agent for concrete

A technology of alcohol polyoxyethylene ether and concrete shrinkage reducing agent, which is applied in the field of concrete shrinkage reducing agent, can solve the problems of difficulty in wide application, toxicity, and high cost of shrinkage reducing agent, and achieve the effects of being beneficial to environmental protection, simple production process, and low production cost

Inactive Publication Date: 2007-11-07
SICHUAN UNIV
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the three shrinkage reducing agents have shrinkage reducing functions on concrete, none of them mentioned whether they can effectively reduce the dry shrinkage and autogenous shrinkage of concrete with low water-binder ratio.
In addition, from the perspective of raw materials or preparation processes used in the three types of shrinkage reducing agents, the cost of shrinkage reducing agents is very high, and it is still difficult to widely apply them in engineering
Furthermore, the concrete shrinkage reducing agents described in CN 1583648A and CN 1648098A are organic compounds or mixtures with small molecular weight, which are liquid at normal temperature and volatile. Some organic substances may themselves be poisonous or have a pungent smell, which may cause environmental pollution in serious cases, affecting workers' health

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polymer of fatty alcohol polyethenoxy ether class, and application as economization agent for concrete
  • Polymer of fatty alcohol polyethenoxy ether class, and application as economization agent for concrete
  • Polymer of fatty alcohol polyethenoxy ether class, and application as economization agent for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment is the preparation of shrinkage reducing agent, raw material has: C 12 ~C 18 Fatty alcohol; Ethylene oxide; Acetic acid; Hydrogen peroxide; Sodium hydroxide. The preparation process is: combine ethylene oxide with C 12 ~C 18 Fatty alcohol is mixed in a ratio of 5:1 by weight, and then sodium hydroxide is added as a catalyst. The amount of sodium hydroxide added is 0.15% of the weight of ethylene oxide, and the condensation reaction is carried out at normal pressure and 170°C to 180°C. The time is about 2 hours. After the reaction is completed, neutralize with acetic acid to pH 7, and bleach with hydrogen peroxide at 70°C to obtain the concrete shrinkage reducer of the present invention.

Embodiment 2

[0028] This example is a concrete test.

[0029] 1. Concrete raw materials for testing

[0030] Cement——42.5R and 52.5R ordinary Portland cement; silica fume; high-efficiency water reducing agent, water reducing rate above 25%; limestone crushed stone coarse aggregate, river sand, fineness modulus 2.4; expansion agent; shrinkage reducing agent (prepared by the method of Example 1).

[0031] 2. Test concrete mix ratio

[0032] The water-binder ratio of concrete used in the test is 0.18, the amount of water reducing agent is 2.5% of the weight of the cementing material, and the amount of shrinkage reducing agent is 0.5% to 1.0% of the weight of the cementing material. A total of 8 groups of concrete samples are formed. The specific combination Such as shown in Table 1. .The shrinkage reducing agent is mixed with other concrete components in the form of solid powder.

[0033] concrete

sample

Numbering

water-binder ratio

Binder

Dosag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
shrinkageaaaaaaaaaa
Login to View More

Abstract

This invention discloses a kind of fatty alcohol polyoxyethylene ether polymers, whose general structural formula is: R-O-(CH2-CH2-O)n-X, wherein R is C12-18 alkyl, n is 15-16, and X is CH2CH2OH or CH2CH3. the fatty alcohol polyoxyethylene ether polymers are an ideal concrete shrinkage reducer, and can reduce the drying shrinkage and autogenous shrinkage of concrete, mortar and cement paste, especially concrete with low water / binder ratio and high strength by adding 0.05-1.2 wt.% of the cement. The addition of 1 wt.% the polymers to the concrete with a water / binder ratio of 0.18 and an age of 3 days to 6 months can reduce the drying shrinkage to 0.000701-0.000875 (reduced by 47.8-67.3%), and the autogenous shrinkage to 0.000256-0.000278 (reduced by 35.6-54.4%).

Description

technical field [0001] The invention belongs to the field of concrete shrinkage reducing agents, in particular to a concrete shrinkage reducing agent capable of reducing drying shrinkage and autogenous shrinkage of high-strength, low-water-binder ratio concrete. Background technique [0002] Concrete is one of the most widely used and used building materials in civil engineering. With the development of concrete technology and the new requirements brought about by the continuous expansion of human production and living activities, concrete is developing towards high strength and high performance. At present, the highest strength level of my country's high-strength concrete structure design regulations has reached C80. The highest strength grades in the design standards of concrete structures in Norway and Germany are C105 and C115 respectively. However, concrete has a big disadvantage of low tensile strength. In a dry environment, concrete shrinka...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/13C04B24/32
CPCC04B24/32C04B2103/58C04B24/085
Inventor 王勇威蒲心诚
Owner SICHUAN UNIV