Preparation method for mortar with low dry shrinkage rate
A dry shrinkage and mortar technology, used in the field of building materials, can solve the problems of cracking and large dry shrinkage, and achieve the effects of reducing friction, reducing shrinkage and increasing the scope of application.
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Embodiment 1
[0021] A method for preparing mortar with low drying shrinkage, comprising the following steps:
[0022] (1) To prepare activated starch ether, treat the starch with an acid solution to obtain acidified starch, mix the acidified starch with an organic solvent 10 times its mass, add it to the reaction kettle, stir evenly, then add the catalyst, and heat it in a water bath to 82 -85°C, heat preservation and stirring for 2 hours, after standing still for 1 hour, remove the upper layer of organic solvent, wash the lower layer of precipitate with absolute ethanol solution, dry to constant weight, and obtain it;
[0023] (2) To prepare mortar, add quartz sand, cement, fly ash, water reducer, and glass fiber to the mixer in sequence, stir, then add water, continue stirring, and finally add activated starch ether, stir evenly, and the product is ready.
[0024] As a further technical solution, the starch is obtained by mixing soybean starch and tapioca starch in a mass ratio of 10:1-1...
Embodiment 2
[0036] A method for preparing mortar with low drying shrinkage, comprising the following steps:
[0037] (1) To prepare activated starch ether, treat the starch with an acid solution to obtain acidified starch, mix the acidified starch with an organic solvent 10 times its mass, add it to the reaction kettle, stir evenly, then add the catalyst, and heat it in a water bath to 82 ℃, heat preservation and stirring for 2 hours, after standing still for 1 hour, remove the organic solvent in the upper layer, wash the lower precipitate with anhydrous ethanol solution, and dry it to constant weight to obtain it;
[0038] (2) To prepare mortar, add quartz sand, cement, fly ash, water reducer, and glass fiber to the mixer in sequence, stir, then add water, continue stirring, and finally add activated starch ether, stir evenly, and the product is ready.
[0039] As a further technical solution, the starch is obtained by mixing soybean starch and tapioca starch in a mass ratio of 10:1, whe...
Embodiment 3
[0051] A method for preparing mortar with low drying shrinkage, comprising the following steps:
[0052] (1) To prepare activated starch ether, treat the starch with an acid solution to obtain acidified starch, mix the acidified starch with an organic solvent 10 times its mass, add it to the reaction kettle, stir evenly, then add the catalyst, and heat it in a water bath to 85 ℃, heat preservation and stirring for 2 hours, after standing still for 1 hour, remove the organic solvent in the upper layer, wash the lower precipitate with anhydrous ethanol solution, and dry it to constant weight to obtain it;
[0053] (2) To prepare mortar, add quartz sand, cement, fly ash, water reducer, and glass fiber to the mixer in sequence, stir, then add water, continue stirring, and finally add activated starch ether, stir evenly, and the product is ready.
[0054]As a further technical solution, the starch is formed by mixing soybean starch and tapioca starch in a mass ratio of 10: 1.3, whe...
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