C70 self-compacting concrete and preparation method thereof
A technology for self-compacting concrete and mixture, applied in the field of concrete, can solve the problems of incomplete functioning, reduced concrete fluidity, influence of concrete workability, etc., and achieves the effects of improving workability, improving compactness, and reducing drying shrinkage
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[0052] Preparation example of antifoaming agent microcapsules
[0053] The defoamers involved in the following preparation examples all use Foshan Nanhai Datian Chemical Co., Ltd. PW-03 type concrete powder defoamer; β-cyclodextrin and gum arabic are both obtained from Xi'an Ravia Biotechnology Co., Ltd.
Example Embodiment
[0054] Preparation Example 1: Antifoaming agent microcapsules are prepared through the following steps:
[0055] S1: Add 1.5kg of β-cyclodextrin to 45kg of water, add a heating mixer and stir until β-cyclodextrin is dissolved, and set the stirring temperature to 55°C, then add 15kg of gum arabic and continue stirring until it is completely dissolved. Form solution A;
[0056] S2: Use a powder defoamer weighing 5kg as a seed crystal, and solution A as a spray agent. Use a spray dryer for spray drying. The semi-dry capsules formed by spray drying are dried at room temperature to form crude defoamer microcapsules;
[0057] S3. Sieving the crude antifoaming agent microcapsules with an 8-mesh sieve to obtain antifoaming agent microcapsules.
Example Embodiment
[0058] Preparation Example 2: Antifoaming agent microcapsules are prepared through the following steps:
[0059] S1: Add 25kg of β-cyclodextrin to 50kg of water, add a heating mixer and stir until β-cyclodextrin is dissolved, and set the stirring temperature to 58°C, then add 16.5kg of gum arabic and continue stirring until it is completely dissolved. Form solution A;
[0060] S2: Use a powder defoamer with a weight of 20 kg as a seed crystal, and solution A as a spray agent. Use a spray dryer for spray drying. The semi-dry capsules formed by spray drying are dried at room temperature to form crude defoamer microcapsules;
[0061] S3. Sieving the crude antifoaming agent microcapsules with an 8-mesh sieve to obtain antifoaming agent microcapsules.
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