A kind of micro-expansion concrete and preparation method thereof

A technology of micro-expansion concrete and expansion agent, applied in the field of concrete, can solve problems such as concrete cracking, achieve the effects of reducing cracking, reducing secondary production, and simple preparation methods

Active Publication Date: 2021-11-09
山东华爵混凝土有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the above-mentioned non-shrinkage cement mineral admixture is used in the production of mass concrete, the following problems exist: when the cement hydration releases heat, the internal temperature of the mass concrete continues to rise up to 80°C, and at this temperature, the ettringite decomposes into monosulfide Calcium aluminum sulfate hydrate, aluminum ions and sulfate ions, aluminum ions and sulfate ions are adsorbed by the C-S-H gel produced by cement hydration at this temperature, when the temperature drops to room temperature, aluminum ions and sulfate ions are condensed from C-S-H The glue is detached and the secondary formation of ettringite with monosulfide-type hydrated aluminum calcium sulfate causes expansion. At this time, the cement has completed hydration and hardened, and the volume expansion of the formed ettringite causes cracking in the 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
  • A kind of micro-expansion concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0046] S1. Weigh 5kg of gum arabic and place it in 75kg of drinking water. Stir and dissolve at 80°C at a speed of 30r / min. After the gum arabic is completely dissolved, add 20kg of drinking water to prepare a 5% gum arabic solution.

[0047] Weigh 5kg of gelatin and place it in 60kg of drinking water. After the gelatin swells, add 35kg of drinking water. Stir and dissolve at 60°C at a speed of 30r / min to prepare a 5% gelatin solution. Configure a 5% gelatin solution:

[0048] S2, 5kg chitosan is dissolved with 6kg10% acetic acid solution, stir 15min with the speed of 150r / min;

[0049] S3. Add 6kg5% gum arabic solution to S2, stir for 15min at a speed of 3000r / min, and gradually heat up to 60°C and keep warm for 1h to generate an emulsion;

[0050] S4. Add 6kg of 5% gelatin solution to the emulsion in S3, and stir at a speed of 500r / min for 15min to prepare the inhibitor.

preparation example 2

[0052] S1. Weigh 5kg of gum arabic and place it in 75kg of drinking water. Stir and dissolve at 80°C at a speed of 30r / min. After the gum arabic is completely dissolved, add 20kg of drinking water to prepare a 5% gum arabic solution.

[0053] Weigh 5kg of gelatin and place it in 60kg of drinking water. After the gelatin swells, add 35kg of drinking water. Stir and dissolve at 60°C at a speed of 30r / min to prepare a 5% gelatin solution. Configure a 5% gelatin solution:

[0054] S2, 7kg chitosan is dissolved with 6kg10% acetic acid solution, stir 15min with the speed of 150r / min;

[0055] S3. Add 6kg5% gum arabic solution to S2, stir for 15min at a speed of 3000r / min, and gradually heat up to 60°C and keep warm for 1h to generate an emulsion;

[0056] S4. Add 6kg of 5% gelatin solution to the emulsion in S3, and stir at a speed of 500r / min for 15min to prepare the inhibitor.

preparation example 3

[0058] S1. Weigh 5kg of gum arabic and place it in 75kg of drinking water. Stir and dissolve at 80°C at a speed of 30r / min. After the gum arabic is completely dissolved, add 20kg of drinking water to prepare a 5% gum arabic solution.

[0059] Weigh 5kg of gelatin and place it in 60kg of drinking water. After the gelatin swells, add 35kg of drinking water. Stir and dissolve at 60°C at a speed of 30r / min to prepare a 5% gelatin solution. Configure a 5% gelatin solution:

[0060] S2, 7kg chitosan is dissolved with 7kg10% acetic acid solution, stir 15min with the speed of 150r / min;

[0061] S3. Add 8kg5% gum arabic solution to S2, stir for 15min at a speed of 3000r / min, and gradually heat up to 60°C and keep warm for 1h to generate an emulsion;

[0062] S4. Add 8kg of 5% gelatin solution to the emulsion in S3, and stir at a speed of 500r / min for 15min to prepare the inhibitor.

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 application relates to the field of concrete, and specifically discloses a micro-expansion concrete and a preparation method thereof. A slightly expansive concrete, comprising the following raw materials in parts by weight: gravel: 850-930, sand: 790-910, cement: 280-360, admixture: 85-135, ettringite-based expansion agent: 25-35 , pumping agent: 6-12, inhibitor: 31-44, drinking water: 150-210, the inhibitor is compounded by chitosan, capsule wall material and pH regulator; its preparation method is: Crushed stone, sand and cement are added to the mixer, after stirring for 5 minutes, add admixture and ettringite-based expansion agent, after stirring for 5 minutes, add pumping agent and drinking water, after stirring for 10 minutes, add inhibitor, and stir for 4 minutes to obtain micro-expansion concrete . The micro-expansion concrete of the present application can be used for pouring large-volume concrete, and has the advantages of reducing secondary generation of ettringite and reducing cracking of large-volume concrete.

Description

technical field [0001] The invention relates to the concrete field, more specifically, it relates to a kind of micro-expansion concrete and a preparation method thereof. Background technique [0002] Micro-expansion concrete refers to the addition of a certain expansion agent to ordinary concrete, so that the concrete can expand to a certain extent during the hydration period by relying on the action of the expansion agent, thereby making up for the shrinkage of the concrete, preventing concrete cracks, and improving concrete performance. Purpose. [0003] Authorized notification number is that the Chinese invention patent of CN102674735B discloses a kind of non-shrinkage cement mineral admixture, comprises alunite, coal cinder and gypsum, also comprises foaming agent and waterproofing agent, and its each component mass percent is alunite: coal cinder: Gypsum: foaming agent: waterproofing agent = 20-30%: 40-60%: 10-20%: 1-5%: 0.1-0.3%, the sum of each component is 100%, usi...

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): C04B28/04C04B28/08C04B24/38C04B24/14B28C5/00
CPCB28C5/003C04B24/14C04B24/38C04B28/04C04B28/08C04B18/12C04B14/06C04B18/08C04B18/141C04B18/146C04B22/148C04B2103/0068C04B24/04C04B22/002
Inventor 韩培毅刘均平唐俊栋李元民刘雁群
Owner 山东华爵混凝土有限公司
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