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High-magnesium low-heat anti-cracking cement for hydraulic mass concrete and preparation method of high-magnesium low-heat anti-cracking cement
The invention belongs to the technical field of anti-crack cement, and particularly discloses high-magnesium low-heat anti-crack cement for hydraulic mass concrete and a preparation method of the high-magnesium low-heat anti-crack cement. The high-magnesium low-heat anti-cracking cement is prepared from the following components in parts by mass: low-heat Portland cement clinker, a light-burned MgO expanding agent, a hydration process regulation and control material and gypsum, wherein the light-burned MgO expanding agent is light-burned MgO of which the hydration activity value is tested to be 90-120s by adopting a citric acid method. The preparation method comprises the following steps: mixing the specific components, grinding and screening. According to the high-magnesium low-heat anti-cracking cement, the hydration activity value of the light-burned MgO expanding agent is particularly limited, so that the expansion process of the cement is matched with the low-hot water hydration and shrinkage process; and in combination with the effects of reducing hydration heat release by the low-heat Portland cement clinker and reducing concentrated heat release by the hydration process regulating material, the characteristics of low hydration heat release and good expansion and temperature drop shrinkage process matching property are ensured, and finally the temperature shrinkage of the hydraulic mass concrete is compensated and the crack resistance of the mass concrete is improved.
本发明属于抗裂水泥技术领域，尤其公开了一种用于水工大体积混凝土的高镁低热抗裂水泥及其制备方法。该高镁低热抗裂水泥包括按特定质量份计的各组分：低热硅酸盐水泥熟料、轻烧MgO膨胀剂、水化历程调控材料、石膏；其中轻烧MgO膨胀剂为采用柠檬酸法测试水化活性值为90s～120s的轻烧MgO。其制备仅将上述特定组分混合配料、研磨筛分即可。该高镁低热抗裂水泥尤以对轻烧MgO膨胀剂的水化活性值的特别限定，保证了其膨胀历程与低热水泥水化及收缩历程相匹配；结合低热硅酸盐水泥熟料减少水化放热、水化历程调控材料减小集中放热的作用，保证了水化放热低、膨胀及温降收缩历程匹配性好的特性，最终实现补偿水工大体积混凝土温度收缩且提升大体积混凝土抗裂性。
High-magnesium low-heat anti-cracking cement for hydraulic mass concrete and preparation method of high-magnesium low-heat anti-cracking cement
The invention belongs to the technical field of anti-crack cement, and particularly discloses high-magnesium low-heat anti-crack cement for hydraulic mass concrete and a preparation method of the high-magnesium low-heat anti-crack cement. The high-magnesium low-heat anti-cracking cement is prepared from the following components in parts by mass: low-heat Portland cement clinker, a light-burned MgO expanding agent, a hydration process regulation and control material and gypsum, wherein the light-burned MgO expanding agent is light-burned MgO of which the hydration activity value is tested to be 90-120s by adopting a citric acid method. The preparation method comprises the following steps: mixing the specific components, grinding and screening. According to the high-magnesium low-heat anti-cracking cement, the hydration activity value of the light-burned MgO expanding agent is particularly limited, so that the expansion process of the cement is matched with the low-hot water hydration and shrinkage process; and in combination with the effects of reducing hydration heat release by the low-heat Portland cement clinker and reducing concentrated heat release by the hydration process regulating material, the characteristics of low hydration heat release and good expansion and temperature drop shrinkage process matching property are ensured, and finally the temperature shrinkage of the hydraulic mass concrete is compensated and the crack resistance of the mass concrete is improved.
本发明属于抗裂水泥技术领域，尤其公开了一种用于水工大体积混凝土的高镁低热抗裂水泥及其制备方法。该高镁低热抗裂水泥包括按特定质量份计的各组分：低热硅酸盐水泥熟料、轻烧MgO膨胀剂、水化历程调控材料、石膏；其中轻烧MgO膨胀剂为采用柠檬酸法测试水化活性值为90s～120s的轻烧MgO。其制备仅将上述特定组分混合配料、研磨筛分即可。该高镁低热抗裂水泥尤以对轻烧MgO膨胀剂的水化活性值的特别限定，保证了其膨胀历程与低热水泥水化及收缩历程相匹配；结合低热硅酸盐水泥熟料减少水化放热、水化历程调控材料减小集中放热的作用，保证了水化放热低、膨胀及温降收缩历程匹配性好的特性，最终实现补偿水工大体积混凝土温度收缩且提升大体积混凝土抗裂性。
High-magnesium low-heat anti-cracking cement for hydraulic mass concrete and preparation method of high-magnesium low-heat anti-cracking cement
一种用于水工大体积混凝土的高镁低热抗裂水泥及其制备方法
ZHANG SHOUZHI (author) / WANG YUJIANG (author) / WANG RUI (author) / PAN LI (author) / TIAN QIAN (author)
2022-11-01
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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