Gypsum and calcium oxide melt inclusion expansion clinker, concrete expansion agent, and preparation method and application thereof

A technology of expanding clinker and calcium oxide, which is applied in the application field of gypsum and calcium oxide molten inclusion concrete expansion agent and its preparation, improving the shrinkage resistance of concrete, and can solve the problem of short shelf life of expansion agent products and short storage time of expansion agent , Expansion clinker is easy to weather and other problems, to achieve the effect of long shelf life, large early expansion and easy firing

Active Publication Date: 2013-06-05
CHINA BUILDING MATERIALS ACAD
View PDF12 Cites 47 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of concrete expansion agent has the disadvantages of poor weathering resistance of clinker and short storage time of expansion agent
[0012] All of the above expansion agents contain free calcium oxide, and the minerals that wrap free calcium oxide are mainly C

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
  • Gypsum and calcium oxide melt inclusion expansion clinker, concrete expansion agent, and preparation method and application thereof
  • Gypsum and calcium oxide melt inclusion expansion clinker, concrete expansion agent, and preparation method and application thereof
  • Gypsum and calcium oxide melt inclusion expansion clinker, concrete expansion agent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1. Preparation of expanded clinker with gypsum and calcium oxide molten inclusions and its performance testing

[0052] According to the ratio shown in Table 1, 40wt%-80wt% limestone (calcium carbonate), 20wt%-60wt% gypsum (anhydrite), and 0.1wt%-1.4wt% aluminum oxide and / or sulfuric acid Aluminum (with no addition of alumina and / or aluminum sulfate as a comparative example) is co-ground to a specific surface area of ​​350m 2 / kg (140-400m 2 / kg) to make a cake with a diameter of 100mm and a thickness of 15mm. After drying at 105°C, put it into an electric furnace for calcination, and then calcine at a constant temperature of 1300°C-1500°C for 120min. The material cake is taken out from the electric furnace and rapidly cooled to obtain clinker.

[0053] Take part of the clinker and grind it to a specific surface area of ​​350m 2 / kg, refer to the current national standard "Concrete Expansion Agent" GB23439-2009 to test the limited expansion rate. Take anothe...

Embodiment 2

[0083] Example 2. Preparation of gypsum and calcium oxide molten inclusion concrete expansion agent and its performance testing

[0084] The preparation method of the gypsum and calcium oxide molten inclusion concrete expansion agent of the present invention comprises the following steps:

[0085] 1) As shown in Table 5, mix 40wt%-80wt% limestone (calcium carbonate), 20wt%-60wt% gypsum (anhydrite) and 0.1wt%-1.0wt% alumina and / or aluminum sulfate co-grind to a specific surface area of ​​350m 2 / kg (140-400m 2 / kg), calcined at a constant temperature of 1350°C in a rotary kiln with a diameter of 1600mm and expanded to 1900mm. The expanded clinker of gypsum and calcium oxide fusion inclusions is obtained.

[0086] 2) According to the ratio shown in Table 5, mix 20wt%-80wt% gypsum and calcium oxide fusion inclusion expansion clinker, 0.05wt% calcium stearate and 0.05wt% triethanolamine mixture, 20wt%-80wt% sulfoaluminic acid Calcium cement clinker (purchased from Xinmi, Henan...

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 gypsum and calcium oxide melt inclusion expansion clinker, a concrete expansion agent, and a preparation method and application thereof, belonging to the field of construction materials. The expansion clinker provided by the invention is prepared by mixed grinding and high-temperature burning of limestone, gypsum and aluminum oxide and/or aluminum sulfate. The concrete expansion agent is prepared by grinding the expansion clinker together with a calcium sulphoaluminate cement clinker, calcium stearate or/and triethanolamine until the specific surface area is 140-400 m<2>/kg. According to the invention, the expansion clinker has high restrained expansion rate and high clinker weathering resistance; the concrete expansion agent has the functions of cracking resistance, seepage resistance, shrinkage compensation and the like, and has the advantage of long product shelf life (up to 6 months). The concrete expansion agent can be used for cracking resistance and seepage resistance of a common concrete structure, and can greatly enhance the durability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, in particular to a concrete expansion agent with gypsum and calcium oxide fusion inclusions, a preparation method thereof and its application in improving the shrinkage resistance performance of concrete. Background technique [0002] Cement concrete is currently the largest building material in the world, with low price and wide application. However, cement concrete is prone to shrinkage and cracking. Among them, drying shrinkage (including self-drying shrinkage) and temperature shrinkage are the two most important shrinkages, which seriously affect the durability of concrete. In order to solve the problem that cement concrete is easy to shrink and crack, researchers have invented expansive cement or concrete expansion agent. Especially concrete expansive agent is favored for its convenience and flexibility. So far, there are many patent documents about concr...

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
IPC IPC(8): C04B22/14C04B24/12C04B24/04
Inventor 赵顺增刘立李长成贾福杰武旭南
Owner CHINA BUILDING MATERIALS ACAD
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