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Rapid-hardening, early-strength, non-shrinkage concrete for free-assembled exterior wall panels, its dry mix, and its preparation method and application

A non-shrinkage, concrete technology, used in building materials, building components, buildings, etc., can solve the problems of poor drying shrinkage volume stability, unsuitable for large-scale applications, and confusion in the expansion agent market, to solve the problem of shrinkage cracking, significant social Effectiveness and economic benefits, the effect of improving market competitiveness

Active Publication Date: 2021-08-27
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shrinkage basically adopts the addition of expansion agent, but the expansion agent market is chaotic and the quality is uneven, resulting in cracking after mixing
High-end products such as calcium sulfoaluminate-calcium oxide dual-expansion source high-performance concrete expansion agent and magnesium oxide expansion agent are expensive and not suitable for large-scale applications
Therefore, the existing concrete still has shortcomings such as unstable construction performance, easy segregation and bleeding under high fluidity, and poor stability of drying shrinkage volume.

Method used

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  • Rapid-hardening, early-strength, non-shrinkage concrete for free-assembled exterior wall panels, its dry mix, and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0070] The preparation method of the free assembling type exterior wall panel of above-mentioned embodiment 1-5 comprises the following steps:

[0071] Put cement, steel slag, slag, salt slag, alkali slag, flow modification material, water reducer, fine aggregate and coarse aggregate into the mixer according to the formula and stir for 30 seconds. After mixing evenly, you can get the free assembly type Dry mix for fast-hardening, early-strength, non-shrinkage concrete for exterior wall panels;

[0072] Put the above-mentioned dry mixture into a concrete mixer, add the prescribed amount of water, and stir for 180 seconds to obtain fast-hardening, early-strength and non-shrinkage concrete.

Embodiment 1

[0073] The method of using the fast-hardening, early-strength, and non-shrinkage concrete for free-assembled exterior wall panels in Example 1 is as follows: Pour the rapid-hardening, early-strength, and non-shrinkage concrete of the above-mentioned Example 1 into a hopper that has been rinsed clean and has no accumulated water, and the hopper is placed Open the valve at a position 30cm-50cm above the center of the mold of the free-form exterior wall panel, and the rapid-hardening, early-strength, non-shrinkage concrete can automatically level and fill the mold under the action of gravity. According to GB / T 50080-2016 "General Concrete Mixture Performance Test Method Standard", GB / T50081-2019 "Concrete Physical and Mechanical Performance Test Method Standard", TJ / GW 112-2013 "High-speed Railway CRTSⅢ Type Slab Ballastless Track Dense Concrete Temporary Technical Conditions" for performance testing. After testing, the properties of the obtained fast-hardening, early-strength an...

Embodiment 2

[0074] The method of using the fast-hardening early-strength non-shrinkage concrete for the free-assembled exterior wall panel of embodiment 2 is the same as that of embodiment 1. After testing, the properties of the obtained fast-hardening, early-strength and non-shrinkage concrete for free-to-assemble exterior wall panels are as follows: expansion degree is 620mm, bleeding rate is 0, 12h compressive strength is 19.4Mpa, 24h vertical expansion rate is 0.47%, There are no defects on the surface of the exterior wall panels.

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Abstract

The invention relates to a fast-hardening, early-strength, non-shrinkage concrete for free-assembly exterior wall boards, its dry mix and its preparation method and application. The dry mix includes: cement: 250-280 parts; steel slag: 60 parts by weight ‑80 parts; slag: 50‑70 parts; salt slag: 4‑6 parts; Material: 820‑910 parts; Coarse aggregate: 910‑1000 parts. The present invention utilizes the stepwise hydration characteristics of f-CaO and f-MgO in steel slag micropowder to make its expansive product Ca(OH) 2 and Mg(OH) 2 The generation rate matches the strength growth and volume change of concrete, effectively expands and compensates shrinkage, improves the volume stability of concrete, achieves no shrinkage, and solves the problem of shrinkage cracking.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a rapid-hardening, early-strength, and non-shrinkage concrete, in particular to a rapid-hardening, early-strength, and non-shrinkage concrete for free-assembled exterior wall panels, its dry mix, and its preparation method and application. Background technique [0002] With the development of my country's construction industrialization and the needs of ecological villages and towns construction, prefabricated buildings have gradually been extended from the field of urban construction to residential buildings in villages and towns. Freely spliced ​​exterior wall panels are building envelope materials that integrate structure, heat preservation and decoration functions. The production molds are freely spliced, and the size can be adjusted arbitrarily, which reduces the cost of mold sharing and is more suitable for residential construction in villages and towns. [0003] The freely s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04E04C2/04
CPCC04B28/04C04B2201/50E04C2/044C04B18/142C04B18/141C04B22/147C04B22/10C04B22/143C04B22/124C04B2103/302C04B14/06C04B14/02C04B14/047C04B2103/50C04B24/383
Inventor 李长成徐宁贾福杰赵顺增
Owner CHINA BUILDING MATERIALS ACAD