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Internal-curing type expanding agent for concrete and preparation method thereof

A technology of concrete internal and expansive agent, which is applied in the field of building materials, can solve the problems of ineffective control of cracks, limited compensation for shrinkage, and reduction of concrete strength, etc., and achieves low cost of comprehensive anti-cracking, simple preparation and use methods, and convenient construction. Effect

Active Publication Date: 2017-11-03
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the actual engineering application is more to reduce the risk of concrete cracking by the compensatory shrinkage effect brought by the addition of expansion agent. Agglomerates reduce the strength of concrete

Method used

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  • Internal-curing type expanding agent for concrete and preparation method thereof
  • Internal-curing type expanding agent for concrete and preparation method thereof
  • Internal-curing type expanding agent for concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The commercially available calcium oxide expanded clinker is crushed into a specific surface area of ​​200m 2 / kg of powder, choose rice husk ash with an average particle size of 20 μm, mix thoroughly according to the ratio of 40% calcium oxide clinker and 60% rice husk ash, and prepare 10kg of concrete internal curing expansion agent IEA-I.

[0037] Concrete was prepared according to the concrete mix ratio of the subway station side wall of a certain rail transit project shown in Table 1, wherein the reference group was without adding any expansion agent, the EA group was mixed with commercially available calcium oxide expansion agent, and the IEA-I group was mixed with Add the internal curing type expansion agent IEA-I prepared by the present invention, and the two kinds of expansion materials are all added to the concrete in the form of internally admixing instead of the cementitious material, and the admixture is 8%, wherein, according to the 24h water absorption rat...

Embodiment 2

[0047] The commercially available calcium oxide expanded clinker is crushed into a specific surface area of ​​400m 2 / kg of powder, choose 700 grade shale light aggregate, crush it to a particle size range of 5-80 μm, and its 24h liquid absorption rate is 23.5%, according to calcium oxide clinker 40%, ground light aggregate 60 The ratio of % is fully mixed to prepare 10kg of concrete internal curing expansion agent IEA-II.

[0048] Concrete was prepared according to the mix ratio of the side wall concrete of a rail transit project subway station shown in Table 3, wherein the benchmark group was without adding any expansion agent, the EA group was mixed with commercially available calcium oxide expansion agent, and the IEA-II group was mixed with Add the internal curing expansion agent IEA-II prepared by the present invention, and the two kinds of expansion materials are all added to the concrete in the form of internal admixture instead of the cementitious material, and the ad...

Embodiment 3

[0057] The commercially available calcium oxide expanded clinker is crushed into a specific surface area of ​​300m 2 / kg powder, choose 900 grade shale light aggregate, crush it to a particle size range of 80-160μm, and its 24h liquid absorption rate is 15.6%, according to calcium oxide clinker 30%, ground light aggregate 70 The ratio of % is fully mixed to prepare 10kg of concrete internal curing expansion agent IEA-III.

[0058] Concrete was prepared according to the concrete mix ratio of the subway station floor of a certain rail transit project shown in Table 5, wherein the reference group was without adding any expansion agent, the EA group was mixed with commercially available calcium oxide expansion agent, and the IEA-III group was mixed with According to the concrete internal curing expansion agent IEA-III prepared in the present invention, two kinds of expansion materials are added into the concrete in the form of internally admixing instead of the cementitious materi...

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Abstract

The invention discloses an internal-curing type expanding agent for concrete and a preparation method thereof. The internal-curing type expanding agent for concrete is composed of expanding clinker and a porous micro-medium, wherein the expanding agent compensates for shrinking; and the porous micro-medium achieves the effect of reducing shrinkage in internal curing and optimizing the hydration process of the expanding agent by regulating and controlling humidity, and also functions as a dispersion carrier of the expanding clinker. The prepared internal-curing type expanding agent takes full advantage of the synergistic effect between the expanding clinker and the porous micro-medium and can effectively reduce the self-shrinkage and drying shrinkage of the concrete, decrease thermal shrinkage in a temperature dropping stage after temperature rise of the concrete, improve the hydration degree of the concrete and overcome the disadvantage of reduced strength of an internally doped expanding agent.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a concrete internal curing expansion agent and a preparation method thereof. Background technique [0002] In fact, the poured concrete structure is in the environment of hydration-temperature-humidity-constraint multi-field coupling. Under the action of this multi-field coupling, the concrete will produce shrinkage deformation and internal stress. When the tensile strength of the concrete is not enough Cracking occurs when the concrete resists the stress of the concrete. This cracking phenomenon becomes more and more serious with the increase of cement fineness and early hydration rate, and it is common in structures such as continuous side wall structures, bottom plates, middle plates, and roof plates. The generation of cracks poses threats and challenges to the durability and safe service of the structure, and the subsequent repair of cracks will also bring great...

Claims

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Application Information

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IPC IPC(8): C04B22/06C04B20/02C04B111/34
CPCC04B20/026C04B40/0039C04B2103/0068C04B2111/343C04B22/064C04B18/101C04B14/108C04B20/008
Inventor 李明刘加平田倩王育江徐文姚婷陆安群
Owner JIANGSU SOBUTE NEW MATERIALS
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