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Super-early-strength admixture and preparation method thereof, and sleeve grouting material for low-temperature steel bar connection

A technology of admixture and ultra-fine powder, which is applied in the field of steel sleeve grouting materials, can solve the problems of easy freezing damage, slow condensation and hardening, etc., and achieve the effect of stable and controllable hydration reaction, high later strength and rapid development

Active Publication Date: 2022-05-10
WUHAN BILLION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the construction requirements under the condition of low / negative temperature (-5°C-10°C) and solve the problem of slow setting and hardening of sleeve grouting material for steel bar connection and easy occurrence of freezing damage, the invention provides a super early strength admixture , and using super-early-strength admixture as one of the raw materials, a low / negative temperature sleeve grout for steel bar connection with simple production process and easy industrialization was prepared. Specifically, it was realized through the following technologies

Method used

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  • Super-early-strength admixture and preparation method thereof, and sleeve grouting material for low-temperature steel bar connection
  • Super-early-strength admixture and preparation method thereof, and sleeve grouting material for low-temperature steel bar connection

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preparation example Construction

[0022] The preparation method of super early strength admixture is:

[0023] S1. Take amorphous calcium aluminate, gypsum, activator, and dispersant, stir evenly, and grind for 30 minutes until an ultrafine powder with a particle size of less than 1 μm is obtained;

[0024] S2. Heat and dry the ultrafine powder obtained in step S1 at 60° C. for 30 minutes, and then heat and dry at 80° C. for 15 minutes;

[0025] S3. Heat and dry the superfine powder obtained in step S2 and modifying agent at 80° C. for modification reaction while stirring, and the stirring speed is 2000-4500 r / min.

[0026] Among the raw materials of super early strength admixture, the relative density of amorphous calcium aluminate used is about 2.85-3.1, and the specific surface area is 4000-4400cm 2 / g, the non-crystallization rate is more than 90%; the gypsum is natural gypsum, the dispersant is silane coupling agent KH550; the modifier is polyethylene glycol 4000 or arabitol; the activator is composed of...

Embodiment 1

[0030] The super-early-strength admixture provided in this embodiment, used amorphous calcium aluminate 85wt%, gypsum 8.5wt%, activator 5wt%, dispersant 0.4wt%, modifier 1.1%; For polyethylene glycol 4000. The activator is composed of calcium formate and lithium carbonate in a weight ratio of 1:0.03.

[0031] The super-early-strength admixture is applied to the steel sleeve grouting material, and the raw materials are 45wt% of cement, 7wt% of the super-early-strength admixture, 46wt% of fine aggregate, and 2% of admixture.

Embodiment 2

[0033] The only difference between the super early-strength admixture provided in this example and Example 1 is that the modifier is arabitol.

[0034] The super-early-strength admixture of this embodiment is applied to the steel sleeve grouting material, and the raw material of the grouting material is the same as that of Example 1.

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Abstract

The invention discloses a super-early-strength admixture, whose raw materials include amorphous calcium aluminate, gypsum, activator, dispersant and modifier; the modifier is a water-soluble alcohol that is solid at 5-35°C The present invention also provides the sleeve grouting material for low-temperature steel bar connection mixed with the super-early-strength admixture, which has good fluidity and workability, can greatly reduce the freezing point of the solution and the cement hardening slurry solution, and is low The continuous hydration reaction of the slurry under negative temperature conditions provides conditions, the early strength develops quickly, and the later strength is high, which can meet the construction and application requirements under low / negative temperature conditions.

Description

technical field [0001] The invention belongs to the field of steel bar sleeve grouting material, in particular to the sleeve grouting material for low-temperature steel bar connection. Background technique [0002] With the promotion and popularization of prefabricated buildings, the application of steel sleeve connection technology is becoming more and more extensive, and the importance of sleeve grouting material as the connection material between ribbed steel bars and sleeves has gradually become prominent. Traditional sleeve grouting materials cannot meet the construction requirements under low temperature conditions. When the temperature is -5-5°C, the setting time of ordinary grouting materials is significantly prolonged, and even freezing damage occurs, making construction impossible. In order to meet the construction needs of low temperature conditions, many scientific research institutes and enterprises have carried out research on low temperature sleeve grouting ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B28/06C04B24/04C04B111/70C04B103/12
CPCC04B40/0039C04B28/06C04B2111/70C04B2103/12C04B22/0093C04B22/143C04B24/04C04B22/10C04B2103/408C04B24/32C04B7/02C04B14/06C04B2103/302C04B2103/44C04B2103/50C04B2103/0068C04B22/142C04B24/02
Inventor 胡凯许亮孙艳张双艳
Owner WUHAN BILLION TECH DEV CO LTD