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A platform for research: civil engineering, architecture and urbanism
Anti-crack concrete for fabricated building and preparation method of anti-crack concrete
The invention discloses anti-crack concrete for prefabricated buildings and a preparation method thereof, and belongs to the technical field of anti-crack concrete.The preparation method comprises the following steps that stearic acid coated calcium carbonate is doped into a silk fibroin solution, and composite fibers are obtained through spinning; mixing the modified graphene oxide with silica powder to prepare aerogel, so as to obtain an anti-cracking aid; mixing the Portland cement, the sand, the stones, the slag powder, the composite fibers, the anti-cracking agent and the anti-cracking aid, then adding the polycarboxylic acid water reducing agent and the water, and stirring to obtain the anti-cracking concrete. Calcium stearate can form a waterproof layer along capillary holes, water passing through the capillary holes is reduced, and cracks caused by expansion due to reaction with free calcium oxide are avoided; the hydrophobic layer on the surface of the fiber can reduce the decomposition of the composite fiber in alkaline concrete; the porous aerogel structure can effectively reduce the thermal conductivity of the concrete, the silica powder serves as a framework in the aerogel, and the situation that the concrete cracks easily due to the fact that graphene oxide is fragile after high-temperature treatment is avoided.
本发明公开了装配式建筑用抗裂混凝土及其制备方法，属于抗裂混凝土技术领域，包括如下步骤：硬脂酸包覆碳酸钙掺入丝素蛋白溶液中，经纺丝，得到复合纤维；将改性氧化石墨烯与硅微粉混合制备气凝胶，得到抗裂助剂；将硅酸盐水泥、砂子、石子、矿渣粉、复合纤维及抗裂剂、抗裂助剂混合，再加入聚羧酸减水剂和水，搅拌，制得抗裂混凝土。硬脂酸钙能够沿着毛细管孔形成防水层，减少水分通过毛细管孔，避免与游离氧化钙反应膨胀形成裂纹；纤维表面含有疏水层能够减少复合纤维在碱性混凝土中分解；多孔气凝胶结构能够有效降低混凝土的导热率，硅微粉在气凝胶中作为骨架，避免氧化石墨烯经高温处理后易脆造成混凝土易产生裂纹。
Anti-crack concrete for fabricated building and preparation method of anti-crack concrete
The invention discloses anti-crack concrete for prefabricated buildings and a preparation method thereof, and belongs to the technical field of anti-crack concrete.The preparation method comprises the following steps that stearic acid coated calcium carbonate is doped into a silk fibroin solution, and composite fibers are obtained through spinning; mixing the modified graphene oxide with silica powder to prepare aerogel, so as to obtain an anti-cracking aid; mixing the Portland cement, the sand, the stones, the slag powder, the composite fibers, the anti-cracking agent and the anti-cracking aid, then adding the polycarboxylic acid water reducing agent and the water, and stirring to obtain the anti-cracking concrete. Calcium stearate can form a waterproof layer along capillary holes, water passing through the capillary holes is reduced, and cracks caused by expansion due to reaction with free calcium oxide are avoided; the hydrophobic layer on the surface of the fiber can reduce the decomposition of the composite fiber in alkaline concrete; the porous aerogel structure can effectively reduce the thermal conductivity of the concrete, the silica powder serves as a framework in the aerogel, and the situation that the concrete cracks easily due to the fact that graphene oxide is fragile after high-temperature treatment is avoided.
本发明公开了装配式建筑用抗裂混凝土及其制备方法，属于抗裂混凝土技术领域，包括如下步骤：硬脂酸包覆碳酸钙掺入丝素蛋白溶液中，经纺丝，得到复合纤维；将改性氧化石墨烯与硅微粉混合制备气凝胶，得到抗裂助剂；将硅酸盐水泥、砂子、石子、矿渣粉、复合纤维及抗裂剂、抗裂助剂混合，再加入聚羧酸减水剂和水，搅拌，制得抗裂混凝土。硬脂酸钙能够沿着毛细管孔形成防水层，减少水分通过毛细管孔，避免与游离氧化钙反应膨胀形成裂纹；纤维表面含有疏水层能够减少复合纤维在碱性混凝土中分解；多孔气凝胶结构能够有效降低混凝土的导热率，硅微粉在气凝胶中作为骨架，避免氧化石墨烯经高温处理后易脆造成混凝土易产生裂纹。
Anti-crack concrete for fabricated building and preparation method of anti-crack concrete
装配式建筑用抗裂混凝土及其制备方法
HUO DEJING (author) / LIU TING (author) / XU XIN (author) / ZHAO XIAOSHAN (author) / XIN YANGYANG (author)
2023-09-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Anti-crack concrete for shield segment and preparation method of anti-crack concrete
| European Patent Office | 2022