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A platform for research: civil engineering, architecture and urbanism
Anti-crack, anti-seepage and corrosion-resistant concrete admixture as well as preparation method and application thereof
The invention discloses an anti-crack, anti-seepage and corrosion-resistant concrete admixture as well as a preparation method and application thereof, and belongs to the technical field of concrete. The admixture comprises the following components in percentage by mass: 30%-60% of a modified calcium-magnesium composite expanding agent, 10%-40% of a waterproof component, 10%-30% of an anti-corrosion and rust-inhibiting component and 5%-25% of a viscosity-reducing component; the preparation method of the modified calcium-magnesium composite expanding agent comprises the following steps: S1, calcining a calcium expanding agent in a fluorine atmosphere to obtain a modified calcium expanding agent; s2, uniformly mixing the modified calcium expanding agent with a magnesium expanding agent, then adding an epoxy silane solution, heating and stirring for reaction, and drying to obtain the modified calcium-magnesium composite expanding agent. Through the synergistic coating effect of calcium fluoride and epoxy silane, the expansion loss of the concrete in the plastic stage can be reduced, the medium-term expansion energy of the concrete in the shrinkage stage is increased, and meanwhile, the water absorption threshold value is increased, so that the situation that the structural stability is threatened due to continuous expansion of the expanding agent in the later hydration stage of the concrete is avoided; further, the crack resistance and the structural stability of the concrete are improved.
本发明公开一种抗裂防渗耐腐蚀混凝土外加剂及其制备方法和应用，属于混凝土技术领域。所述外加剂包括以下质量百分数的各组分：改性钙镁复合膨胀剂30％～60％、防水组分10％～40％、防腐阻锈组分10％～30％、降粘组分5％～25％；改性钙镁复合膨胀剂的制备方法包括以下步骤：S1.将钙质膨胀剂置于氟气氛围下进行煅烧，得到改性钙质膨胀剂；S2.将改性钙质膨胀剂与镁质膨胀剂混合均匀，然后加入环氧硅烷溶液，加热搅拌反应，干燥后得到改性钙镁复合膨胀剂。本发明通过氟化钙和环氧硅烷的协同包覆作用，能够降低混凝土塑性阶段的膨胀损失，增大混凝土收缩阶段的中期膨胀能，同时提高吸水阈值避免膨胀剂在混凝土水化后期继续膨胀威胁结构的稳定性，进而提高混凝土的抗裂性和结构稳定性。
Anti-crack, anti-seepage and corrosion-resistant concrete admixture as well as preparation method and application thereof
The invention discloses an anti-crack, anti-seepage and corrosion-resistant concrete admixture as well as a preparation method and application thereof, and belongs to the technical field of concrete. The admixture comprises the following components in percentage by mass: 30%-60% of a modified calcium-magnesium composite expanding agent, 10%-40% of a waterproof component, 10%-30% of an anti-corrosion and rust-inhibiting component and 5%-25% of a viscosity-reducing component; the preparation method of the modified calcium-magnesium composite expanding agent comprises the following steps: S1, calcining a calcium expanding agent in a fluorine atmosphere to obtain a modified calcium expanding agent; s2, uniformly mixing the modified calcium expanding agent with a magnesium expanding agent, then adding an epoxy silane solution, heating and stirring for reaction, and drying to obtain the modified calcium-magnesium composite expanding agent. Through the synergistic coating effect of calcium fluoride and epoxy silane, the expansion loss of the concrete in the plastic stage can be reduced, the medium-term expansion energy of the concrete in the shrinkage stage is increased, and meanwhile, the water absorption threshold value is increased, so that the situation that the structural stability is threatened due to continuous expansion of the expanding agent in the later hydration stage of the concrete is avoided; further, the crack resistance and the structural stability of the concrete are improved.
本发明公开一种抗裂防渗耐腐蚀混凝土外加剂及其制备方法和应用，属于混凝土技术领域。所述外加剂包括以下质量百分数的各组分：改性钙镁复合膨胀剂30％～60％、防水组分10％～40％、防腐阻锈组分10％～30％、降粘组分5％～25％；改性钙镁复合膨胀剂的制备方法包括以下步骤：S1.将钙质膨胀剂置于氟气氛围下进行煅烧，得到改性钙质膨胀剂；S2.将改性钙质膨胀剂与镁质膨胀剂混合均匀，然后加入环氧硅烷溶液，加热搅拌反应，干燥后得到改性钙镁复合膨胀剂。本发明通过氟化钙和环氧硅烷的协同包覆作用，能够降低混凝土塑性阶段的膨胀损失，增大混凝土收缩阶段的中期膨胀能，同时提高吸水阈值避免膨胀剂在混凝土水化后期继续膨胀威胁结构的稳定性，进而提高混凝土的抗裂性和结构稳定性。
Anti-crack, anti-seepage and corrosion-resistant concrete admixture as well as preparation method and application thereof
一种抗裂防渗耐腐蚀混凝土外加剂及其制备方法和应用
LIU ZHIJUN (author) / QU RENQUAN (author) / YU DONGJIAN (author) / WU YUANJUN (author) / WU CHUNYANG (author) / LI XINGYUE (author) / WEI DE'EN (author) / ZHU GUOJUN (author) / QIN ZHEHUAN (author)
2023-11-24
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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