High-performance polycarboxylic acid water reducer and special compound admixture containing the water reducer for limestone powder concrete

A technology with limestone powder and high performance, which is applied in the field of special composite admixtures for limestone powder concrete, which can solve problems such as unfavorable engineering construction, bleeding, and increased dosage of concrete admixtures, so as to achieve good workability of concrete and improve water retention performance , the effect of excellent sustained release performance

Active Publication Date: 2014-02-19
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
View PDF1 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although limestone powder has a good application prospect in ready-mixed concrete, limestone powder also brings some new problems to concrete: the water retention of limestone powder particles is poor, and it is easy to produce bleeding when the amount of limestone powder is added to the concrete. Water phenomenon; limestone powder is easy to cause the loss of concrete work performance too quickly, so it is not used in engineering construction; due to the difference in limestone material, some limestone powder has a greater impact on the work performance of concrete, resulting in a substantial increase in the amount of concrete admixtures, which is not conducive to concrete. Production quality control and cost control
[0004] At present, the existing polycarboxylate water-reducing agent already has a high water-reducing rate, and it can also make concrete achieve better workability and containment in conventional material systems such as cement, fly ash, mineral powder, and silica fume. Plasticity, but in the cement and limestone powder system, it is difficult to achieve good workability and plasticity. Moreover, according to the existing literature and reports, there is no special water reducer for limestone powder concrete.

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
  • High-performance polycarboxylic acid water reducer and special compound admixture containing the water reducer for limestone powder concrete
  • High-performance polycarboxylic acid water reducer and special compound admixture containing the water reducer for limestone powder concrete
  • High-performance polycarboxylic acid water reducer and special compound admixture containing the water reducer for limestone powder concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Component c maleic anhydride glycol ester, the preparation method is: under inert atmosphere, put ethylene glycol into 1# reactor, heat up to 30°C, and then put maleic anhydride solid into 1# In the reaction kettle, stir for 3 hours to obtain the esterified maleic anhydride glycol ester, labeled as c1. Wherein, the molar ratio of maleic anhydride and ethylene glycol is 2.5:1.

[0033] (2) Polycarboxylate high-performance water reducer I, the preparation method of which is:

[0034] According to the mass percentage of monomer a isopentenyl polyoxyethylene ether, monomer b methyl acrylate and maleic anhydride diol ester c1 is 71wt%, 10wt%, 29wt; the preparation of ammonium persulfate (initiator) Amount by weight is 0.2% of the total weight of reaction monomer a, b and c1; The amount of stock preparation of mercaptoacetic acid (chain transfer agent) is by weight 0.1% of the total weight of monomer a, b and component c1;

[0035] Maleic anhydride dihydric alcohol...

Embodiment 2

[0041] (1) Component c maleic anhydride glycol ester, its preparation method is: under inert atmosphere, put butanediol into 1# reactor, heat up to 45°C, and then put maleic anhydride solid into 1# In the reaction kettle, stir for 2 hours to obtain the esterified maleic anhydride glycol ester, labeled as c2. Wherein, the molar ratio of maleic anhydride and ethylene glycol is 2.5:1.

[0042] (2) Polycarboxylate high-performance water reducer I, the preparation method of which is:

[0043] According to the mass percent of monomer a isopentenyl polyoxyethylene ether, monomer b methyl acrylate and maleic anhydride glycol ester c2 is 80wt%, 1wt%, 19wt to prepare materials;

[0044] Maleic anhydride glycol ester c2 is made into an aqueous solution, and the mass concentration is 50%;

[0045] The stock quantity of ammonium persulfate (initiator) is by weight 0.5% of the total weight of reaction monomer a, b and c2;

[0046] The stock quantity of mercaptoacetic acid (chain transfer...

Embodiment 3

[0051] (1) Component c maleic anhydride diol ester, its preparation method is: under inert atmosphere, put octane glycol into 1# reaction kettle, heat up to 60°C, and then put maleic anhydride solid into 1# In the reaction kettle, stir for 1 h to obtain the esterified maleic anhydride glycol ester, labeled as c3. Wherein, the molar ratio of maleic anhydride and ethylene glycol is 2.5:1.

[0052] (2) Polycarboxylate high-performance water reducer I, the preparation method of which is:

[0053] According to the mass percent of monomer a isopentenyl polyoxyethylene ether, monomer b methyl acrylate and maleic anhydride glycol ester c3, it is 90wt%, 5wt%, 5wt% to prepare materials;

[0054] Maleic anhydride dihydric alcohol ester c1 is formulated into an aqueous solution with a mass concentration of 50%;

[0055] The stock quantity of ammonium persulfate (initiator) is by weight 0.3% of the gross weight of reaction monomer a, b and c3;

[0056] The stock quantity of mercaptoacet...

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

No PUM Login to view more

Abstract

The invention relates to a high-performance polycarboxylic acid water reducer and a special compound admixture containing the water reducer for limestone powder concrete. The special compound admixture for limestone powder concrete comprises a high-performance polycarboxylic acid water reducer I 5 to 10wt%, a high-performance polycarboxylic acid water reducer II 10 to 15wt%, retarder 1 to 5wt%, defoamer 0 to 0.2wt%, air entraining agent 0 to 0.1wt%, and water 70 to 80wt%, wherein the sum of mass percents of every component is 100%. The admixture provided by the invention can effectively improve workability of fresh limestone powder concrete, and can prevent 3-hour work performance loss of fresh limestone powder concrete without influencing concrete strength development. The admixture preparation method is unique, simple and feasible, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a polycarboxylate high-performance water reducer and a special composite admixture for limestone powder concrete containing the same. Background technique [0002] In recent years, with the rapid development of the domestic construction industry, the demand for concrete has been increasing year by year, and the supply of traditional mineral admixtures has been in short supply. With the adjustment of the national energy strategy and the development and progress of the electric power field, thermal power generation will decrease year by year, and the fly ash resources will inevitably become increasingly scarce. Limestone is the most readily available, easy-to-grind, and low-cost material. Grinding it into limestone powder to replace conventional mineral admixtures such as fly ash is an inevitable development trend in the concrete industry in the future. [0003] Although limestone powder h...

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 Applications(China)
IPC IPC(8): C04B24/32C04B24/26C08F283/06C08F222/14C08F220/14C08F2/38C04B103/30
Inventor 王军陈景李东来夏远英徐庭波韩周冰沈浩张建亮
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap