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A platform for research: civil engineering, architecture and urbanism
Springback value regulator for sprayed concrete and application of springback value regulator
The invention discloses a springback value regulator for sprayed concrete and application of the springback value regulator, and belongs to the field of building material concrete admixtures. The springback amount regulator is prepared from the following components in parts by weight: 0.5 to 1.5 parts of composite modified polyvinyl alcohol, 200 to 545 parts of superfine mineral powder, 5 to 20 parts of silicate, 420 to 795 parts of bentonite, 0 to 15 parts of calcium salt and 0 to 15 parts of thickening time control agent, the composite modified polyvinyl alcohol is obtained by copolymerizing vinyl acetate and unsaturated silane and then carrying out graft copolymerization with nano SBR (Styrene Butadiene Rubber). According to the composite modified polyvinyl alcohol disclosed by the invention, the water retention effect is exerted, meanwhile, the intermolecular acting force can be increased, and the binding power between cement paste and gravel particles and the binding power between the cement paste and a sprayed wall body are enhanced; meanwhile, the mechanical property of the slurry can also be improved; and therefore, the springback rate of sprayed concrete is reduced. The springback value regulator can reduce the springback rate of sprayed concrete, and the springback rate is reduced to 12% or below; meanwhile, the early-stage and later-stage strength of the sprayed concrete can be improved.
本发明公开一种喷射混凝土用回弹量调节剂及其应用，属于建筑材料混凝土外加剂领域。所述回弹量调节剂包括以下重量份的各组分：复合改性聚乙烯醇0.5～1.5份，超细矿粉200～545份，硅酸盐5～20份，皂土420～795份，钙盐0～15份，调凝剂0～15份；所述复合改性聚乙烯醇由醋酸乙烯酯与不饱和硅烷共聚后，再与纳米SBR接枝共聚得到。本发明的复合改性聚乙烯醇，在发挥保水作用的同时，可以增加分子间作用力，加强水泥浆体与砂石颗粒之间以及水泥浆体与受喷墙体之间的粘结力；同时还能够提高浆体的力学性能；从而减少喷射混凝土的回弹率。本发明的回弹量调节剂可以降低喷射混凝土的回弹率，回弹率降低至12％以下；同时可以提高喷射混凝土的早期和后期强度。
Springback value regulator for sprayed concrete and application of springback value regulator
The invention discloses a springback value regulator for sprayed concrete and application of the springback value regulator, and belongs to the field of building material concrete admixtures. The springback amount regulator is prepared from the following components in parts by weight: 0.5 to 1.5 parts of composite modified polyvinyl alcohol, 200 to 545 parts of superfine mineral powder, 5 to 20 parts of silicate, 420 to 795 parts of bentonite, 0 to 15 parts of calcium salt and 0 to 15 parts of thickening time control agent, the composite modified polyvinyl alcohol is obtained by copolymerizing vinyl acetate and unsaturated silane and then carrying out graft copolymerization with nano SBR (Styrene Butadiene Rubber). According to the composite modified polyvinyl alcohol disclosed by the invention, the water retention effect is exerted, meanwhile, the intermolecular acting force can be increased, and the binding power between cement paste and gravel particles and the binding power between the cement paste and a sprayed wall body are enhanced; meanwhile, the mechanical property of the slurry can also be improved; and therefore, the springback rate of sprayed concrete is reduced. The springback value regulator can reduce the springback rate of sprayed concrete, and the springback rate is reduced to 12% or below; meanwhile, the early-stage and later-stage strength of the sprayed concrete can be improved.
本发明公开一种喷射混凝土用回弹量调节剂及其应用，属于建筑材料混凝土外加剂领域。所述回弹量调节剂包括以下重量份的各组分：复合改性聚乙烯醇0.5～1.5份，超细矿粉200～545份，硅酸盐5～20份，皂土420～795份，钙盐0～15份，调凝剂0～15份；所述复合改性聚乙烯醇由醋酸乙烯酯与不饱和硅烷共聚后，再与纳米SBR接枝共聚得到。本发明的复合改性聚乙烯醇，在发挥保水作用的同时，可以增加分子间作用力，加强水泥浆体与砂石颗粒之间以及水泥浆体与受喷墙体之间的粘结力；同时还能够提高浆体的力学性能；从而减少喷射混凝土的回弹率。本发明的回弹量调节剂可以降低喷射混凝土的回弹率，回弹率降低至12％以下；同时可以提高喷射混凝土的早期和后期强度。
Springback value regulator for sprayed concrete and application of springback value regulator
一种喷射混凝土用回弹量调节剂及其应用
WEI KAI (author) / LU JIAHU (author) / LI TIANXIONG (author) / LI ZHENGPING (author) / ZHANG YUN (author) / ZHENG XINGXING (author) / WANG YUAN (author) / JI XIANKUN (author)
2022-06-07
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
| European Patent Office | 2023
| European Patent Office | 2023
Interface agent for reducing springback rate of sprayed concrete and construction method
| European Patent Office | 2023