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Preparation method of superfine composite admixture
The invention discloses a preparation method of a superfine composite admixture, the superfine composite admixture comprises the following components in parts by mass: 50-80 parts of a pozzolanic material and 10-30 parts of a calcareous material, and the preparation method comprises the following steps: step 1, grinding and mixing the pozzolanic material and the calcareous material, drying, adding polyvinyl alcohol accounting for 1-5% of the total mass, and grinding and mixing again to obtain a gel precursor; step 2, carrying out freeze drying on the gel precursor to obtain an aerogel precursor; and step 3, pressing the aerogel precursor, and then grinding and drying to obtain the superfine composite admixture. The prepared admixture has a larger specific surface area, the grain composition in the admixture can be improved, the system is more compact, the pore structure of concrete is improved, the gel pore proportion is increased, the harmful pore proportion is reduced, and the compactness of the concrete is improved.
本发明公开了一种超细复合掺加料的制备方法，按照质量份数计，组分为火山灰质材料50~80份，石灰质材料10~30份，制备方法如下：步骤一，将火山灰质材料和石灰质材料进行研磨混合，干燥后加入总质量1~5%的聚乙烯醇，再次研磨混合，得到凝胶前驱体；步骤二，将凝胶前驱体进行冷冻干燥，得到气凝胶前驱体；步骤三，对气凝胶前驱体压制，然后研磨干燥，得到超细复合掺加料。本发明制备的掺加料具有更大的比表面积，可以改善掺加料中的颗粒级配，使体系更加密实，改善混凝土的孔结构，提高胶凝孔隙比例，减少有害孔比例，提高混凝土的致密性。
Preparation method of superfine composite admixture
The invention discloses a preparation method of a superfine composite admixture, the superfine composite admixture comprises the following components in parts by mass: 50-80 parts of a pozzolanic material and 10-30 parts of a calcareous material, and the preparation method comprises the following steps: step 1, grinding and mixing the pozzolanic material and the calcareous material, drying, adding polyvinyl alcohol accounting for 1-5% of the total mass, and grinding and mixing again to obtain a gel precursor; step 2, carrying out freeze drying on the gel precursor to obtain an aerogel precursor; and step 3, pressing the aerogel precursor, and then grinding and drying to obtain the superfine composite admixture. The prepared admixture has a larger specific surface area, the grain composition in the admixture can be improved, the system is more compact, the pore structure of concrete is improved, the gel pore proportion is increased, the harmful pore proportion is reduced, and the compactness of the concrete is improved.
本发明公开了一种超细复合掺加料的制备方法，按照质量份数计，组分为火山灰质材料50~80份，石灰质材料10~30份，制备方法如下：步骤一，将火山灰质材料和石灰质材料进行研磨混合，干燥后加入总质量1~5%的聚乙烯醇，再次研磨混合，得到凝胶前驱体；步骤二，将凝胶前驱体进行冷冻干燥，得到气凝胶前驱体；步骤三，对气凝胶前驱体压制，然后研磨干燥，得到超细复合掺加料。本发明制备的掺加料具有更大的比表面积，可以改善掺加料中的颗粒级配，使体系更加密实，改善混凝土的孔结构，提高胶凝孔隙比例，减少有害孔比例，提高混凝土的致密性。
Preparation method of superfine composite admixture
一种超细复合掺加料的制备方法
ZHANG XINJIE (author)
2024-02-09
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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