Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-shrinkage high-strength concrete and preparation method thereof
The invention discloses low-shrinkage high-strength concrete, and belongs to the technical field of building materials. The low-shrinkage high-strength concrete is prepared from the following materials in parts by mass: 326 to 476 parts of cement, 97 to 116 parts of water, 72 to 95 parts of fly ash, 400 to 470 parts of quartz sand, 13 to 25 parts of a water reducing agent, 17 to 35 parts of an expanding agent and 5 to 15 parts of super absorbent resin. The cement is P.O.52.5 Portland cement, the water reducing agent is a polycarboxylate superplasticizer, the solid content is 40%, and the waterreducing rate is 33%; the expanding agent is a UEA type expanding agent, and the expansion rate is greater than 0.02%; the main component of the super absorbent resin is 200 meshes of low-crosslinking sodium polyacrylate, and the 24-hour water absorption rate of the super absorbent resin is 700 times of that of polymer absorbent resin. By using the expanding agent and the super absorbent resin, the shrinkage of the high-strength concrete is reduced from the aspects of shrinkage compensation and shrinkage inhibition, the purpose of greatly reducing the shrinkage of the high-strength concrete is achieved on the premise that the compressive strength of the high-strength concrete is not reduced, the high-strength concrete with a relatively stable volume can be prepared, cracking is avoided, and the durability and the service performance of the high-strength concrete are improved.
本发明公开了一种低收缩高强混凝土，属于建筑材料技术领域。所述的低收缩高强混凝土包括以下质量份的材料：水泥：326～476份，水：97～116份，粉煤灰：72～95份，石英砂：400～470份，减水剂：13～25份，膨胀剂：17～35份，超吸水树脂：5～15份。所述的水泥为P.O.52.5硅酸盐水泥，所述的减水剂为聚羧酸高效减水剂，含固量40％，减水率33％；所述膨胀剂为UEA型膨胀剂，膨胀率大于0.02％；所述的超吸水树脂主要成分为低交联型聚丙烯酸钠的200目，24h吸水率为700倍的高分子吸水树脂。本发明通过使用膨胀剂和超吸水树脂从收缩补偿和收缩抑制角度减小高强混凝土收缩，在不降低高强混凝土抗压强度的前提下，实现大幅减小其收缩的目的，可制得体积较为稳定的高强混凝土，避免产生开裂，提高其耐久性和服役性能。
Low-shrinkage high-strength concrete and preparation method thereof
The invention discloses low-shrinkage high-strength concrete, and belongs to the technical field of building materials. The low-shrinkage high-strength concrete is prepared from the following materials in parts by mass: 326 to 476 parts of cement, 97 to 116 parts of water, 72 to 95 parts of fly ash, 400 to 470 parts of quartz sand, 13 to 25 parts of a water reducing agent, 17 to 35 parts of an expanding agent and 5 to 15 parts of super absorbent resin. The cement is P.O.52.5 Portland cement, the water reducing agent is a polycarboxylate superplasticizer, the solid content is 40%, and the waterreducing rate is 33%; the expanding agent is a UEA type expanding agent, and the expansion rate is greater than 0.02%; the main component of the super absorbent resin is 200 meshes of low-crosslinking sodium polyacrylate, and the 24-hour water absorption rate of the super absorbent resin is 700 times of that of polymer absorbent resin. By using the expanding agent and the super absorbent resin, the shrinkage of the high-strength concrete is reduced from the aspects of shrinkage compensation and shrinkage inhibition, the purpose of greatly reducing the shrinkage of the high-strength concrete is achieved on the premise that the compressive strength of the high-strength concrete is not reduced, the high-strength concrete with a relatively stable volume can be prepared, cracking is avoided, and the durability and the service performance of the high-strength concrete are improved.
本发明公开了一种低收缩高强混凝土，属于建筑材料技术领域。所述的低收缩高强混凝土包括以下质量份的材料：水泥：326～476份，水：97～116份，粉煤灰：72～95份，石英砂：400～470份，减水剂：13～25份，膨胀剂：17～35份，超吸水树脂：5～15份。所述的水泥为P.O.52.5硅酸盐水泥，所述的减水剂为聚羧酸高效减水剂，含固量40％，减水率33％；所述膨胀剂为UEA型膨胀剂，膨胀率大于0.02％；所述的超吸水树脂主要成分为低交联型聚丙烯酸钠的200目，24h吸水率为700倍的高分子吸水树脂。本发明通过使用膨胀剂和超吸水树脂从收缩补偿和收缩抑制角度减小高强混凝土收缩，在不降低高强混凝土抗压强度的前提下，实现大幅减小其收缩的目的，可制得体积较为稳定的高强混凝土，避免产生开裂，提高其耐久性和服役性能。
Low-shrinkage high-strength concrete and preparation method thereof
一种低收缩高强混凝土及其制备方法
CHEN QIAN (Autor:in) / CHEN PEIYUAN (Autor:in) / WANG PENGJU (Autor:in) / ZHANG LIHENG (Autor:in) / HE SHICHENG (Autor:in)
24.07.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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