Formula for controlling springback of sprayed concrete

The invention discloses a formula for controlling springback of sprayed concrete, and the sprayed concrete comprises the following materials: 45%-55% of gravel, 424kg/m < 3 >-464kg/m < 3 > of cement, 0.39-0.43 of water-cement ratio, and 0.08%-0.12% of additives: polypropylene fiber, chop...

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Main Authors ZHANG MINGFU, DU YAOHUI, ZHOU FEI, XU HONGLIU, YANG FAN, XI KANGLI, XU GAOHE, FENG XIAONING, GAO YUE, WANG MENG, CAO JUN
Format Patent
LanguageChinese
English
Published 16.11.2021
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:The invention discloses a formula for controlling springback of sprayed concrete, and the sprayed concrete comprises the following materials: 45%-55% of gravel, 424kg/m < 3 >-464kg/m < 3 > of cement, 0.39-0.43 of water-cement ratio, and 0.08%-0.12% of additives: polypropylene fiber, chopped basalt fiber and ultra-high performance synthetic fiber. The method comprises the following steps: step 1, controlling various data such as a sand-gravel ratio, a cement mixing amount, an additive mixing amount, a water-binder ratio and the like by adopting an indoor test mode, and recording a sprayed concrete rebound rate caused when the proportion of each influence factor is changed; the deformation mechanism and stability analysis of the tunnel supporting structure are researched by combining field monitoring measurement data and numerical simulation analysis, the technical problems of serious tunnel overexcavation and high springback loss of sprayed concrete are solved to a large extent, and great social and economic,
Bibliography:Application Number: CN202110946845