Concrete composite air entraining agent, its preparation and use methods

A technology of air-entraining agent and concrete, which is applied in the field of building materials, can solve the problems of poor solubility of air-entraining agent, poor bubble stability, strong bubble accumulation, etc., and achieve adjustable air-entraining volume, small negative impact on strength, and increased stability Effect

Inactive Publication Date: 2014-02-05
TONGJI UNIV
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Problems solved by technology

These three types of air-entraining agents are currently the main air-entraining agents used in the Chinese market, but these three types of air-entraining agents have more or less defects: rosin resin air-entraining agents have poor solubility; The bubble wall is thicke...

Method used

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  • Concrete composite air entraining agent, its preparation and use methods
  • Concrete composite air entraining agent, its preparation and use methods
  • Concrete composite air entraining agent, its preparation and use methods

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1, concrete composite air-entraining agent is formulated by sodium lauryl sulfate 48% (mass percentage, the same below), β-cyclodextrin 47%, gum arabic 2%, bone glue 3%, and benchmark concrete ( Compared with the concrete without adding the air-entraining agent, adding the air-entraining agent accounting for 0.004% of the cement mass can make the air content of the concrete reach 3%, the water reduction rate reaches 5.4%, and the bleeding rate decreases by 40% %, while the 3d, 7d, and 28d compressive strength ratios are all above 100%.

Embodiment 2

[0036] Example 2, the concrete composite air-entraining agent is prepared by 32% sodium lauryl sulfate, 57% beta-cyclodextrin, 3% gum arabic, and 8% bone glue. 0.012% of the air-entraining agent can make the air content of concrete reach 4.5%, the water reducing rate reach 6.5%, the bleeding rate reduce 70%, and the 3d, 7d, and 28d compressive strength ratios are all above 100%. Embodiment 3, the composite air-entraining agent for concrete is prepared by 31% sodium lauryl sulfate, 60% β-cyclodextrin, 6% gum arabic, and 3% bone glue. 0.016% of the air-entraining agent can make the air content of concrete reach 5.3%, the water reducing rate reach 7.6%, the bleeding rate reduce 64%, and the 3d, 7d, and 28d compressive strength ratios are all above 95%. Example 4, the composite air-entraining agent for concrete is prepared by 19% sodium lauryl sulfate, 77% beta-cyclodextrin, 2% gum arabic, and 2% bone glue. 0.02% of the air-entraining agent can make the air content of concrete re...

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Abstract

Belonging to the technical field of building materials, the invention discloses a concrete composite air entraining agent, its preparation and use methods. The composite air entraining agent is composed of sodium dodecyl sulfate (14-60%), beta-cyclodextrin (30-84%), Arabic gum (1-8%), and bone gum (1-10%). The component raw materials are stirred evenly by physical and mechanical mixing, thus obtaining the concrete composite air entraining agent. During use, the dosage of the air entraining agent accounts for 0.004%-0.03% of the weight of cement in concrete. The concrete composite air entraining agent provided by the invention has the advantages of wide raw material sources, simple production method and excellent product performance, can introduce a lot of small, uniform and stable bubbles into concrete, enhances the water-retaining property of green concrete, improves workability, reduces slump loss, also greatly improves the freeze-thaw cycling resistance, salt-freezing resistance and other durability indicators of concrete, and has small negative influence on the strength of a hardened body. The concrete composite air entraining agent provided by the invention can be used in reinforced concrete, lightweight aggregate concrete, artificial aggregate concrete, bridges, buildings, hydraulic engineerings, pavements and other structures.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a composite air-entraining agent for concrete. Background technique [0002] Modern engineering requires high strength, high fluidity and high durability for concrete. Careful use of a certain amount of air-entraining agent in concrete engineering can produce a certain amount of fine round closed air cells in fresh concrete, which can improve the workability of concrete, reduce segregation and bleeding of the mixture, and improve Concrete uniformity, durability is very beneficial. However, the addition of common types of air-entraining agents such as sodium alkyl sulfonate, lignosulfonate, etc., has a great negative impact on the strength of concrete due to the unreasonable structure of the introduced air bubbles (the air content of concrete increases by 1%. The compressive strength is reduced by 4%-6%, and the flexural strength is reduced by 2%-3%), whic...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B103/30
Inventor 张雄高辉张永娟郇坤
Owner TONGJI UNIV
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