Sprayed concrete and preparation method thereof

A shotcrete and concrete technology, applied in the field of civil engineering materials, can solve the problems of reduced overall fluidity of concrete, increased concrete defects, weakened overall performance, etc., and achieves the effects of improving volume stability, reducing cracking risk, and improving workability

Inactive Publication Date: 2018-12-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if nano-SiO 2 Excessive amount of nano-SiO 2 There will be agglomeration, and a large amount of water will be consumed. In the absence of sufficient water to ensure the hydration of cement, the internal defects of concr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1:

[0030] A shotcrete which includes the following components according to mass ratio:

[0031] Cement: Fine Aggregate: Glass Fiber: Fly Ash: Water Reducer: Water Retention Agent: Nano SiO 2 =100:100:2.2:25:1.5:0.1:5.

[0032] The cement is Portland cement with a strength number of 42.5R.

[0033] The fine aggregate is quartz sand, the purity of which is higher than 99 wt%, and the particle size range is 0.5 mm to 2 mm.

[0034] The glass fiber is a surface-modified alkali-resistant glass fiber with a modulus of elasticity higher than 70 GPa and a length of 6 mm. The modification method is as follows: the glass fiber is soaked in acetone and ultrasonicated for 3 minutes, and then the surface of the fiber is organic After the solvent is washed off, it is dried at 40°C, and finally soaked in pure acrylic emulsion for 3 minutes, then taken out and dried at room temperature. Among them, the pure acrylic emulsion is a ternary copolymer emulsion of methacrylate, acrylic and...

Example Embodiment

[0044] Example 2:

[0045] A shotcrete which includes the following components according to mass ratio:

[0046] Cement: Fine Aggregate: Glass Fiber: Fly Ash: Water Reducer: Water Retention Agent: Nano SiO 2 =100:110:2.0:25:1.5:0.1:6.

[0047] The cement is Portland cement with a strength number of 32.5R.

[0048] The fine aggregate is quartz sand, the purity of which is higher than 99 wt%, and the particle size range is 0.5 mm to 2 mm.

[0049] The glass fiber is a surface-modified alkali-resistant glass fiber with a modulus of elasticity higher than 70 GPa and a length of 12 mm. The modification method is as follows: the glass fiber is soaked in acetone and ultrasonicated for 5 minutes, and then the surface of the fiber is organic After washing off the solvent, dry it at 50°C, and finally soak it in pure acrylic emulsion for 5 minutes, then take it out and dry it at room temperature. The pure acrylic emulsion is a ternary copolymer emulsion of methacrylate, acrylate and acrylic acid...

Example Embodiment

[0059] Example 3:

[0060] A shotcrete which includes the following components according to mass ratio:

[0061] Cement: Fine Aggregate: Glass Fiber: Fly Ash: Water Reducer: Water Retention Agent: Nano SiO 2 =100:110:2.5:20:1.0:0.13:6.

[0062] The cement is low-alkali sulphoaluminate cement with a strength number of 42.5.

[0063] The fine aggregate is river sand, the purity of which is higher than 99wt%, and the particle size range is 0.5mm-2mm.

[0064] The glass fiber is a surface-modified alkali-resistant glass fiber with an elastic modulus higher than 70 GPa and a length of 9 mm. The modification method is as follows: the glass fiber is soaked in acetone and ultrasonicated for 4 minutes, and then the surface of the fiber is organic After the solvent is washed off, it is dried at 45°C, and finally soaked in pure acrylic emulsion for 4 minutes, then taken out and dried at room temperature. Among them, the pure acrylic emulsion is a ternary copolymer emulsion of methacrylate, acryl...

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Abstract

The invention discloses sprayed concrete and a preparation method thereof. The sprayed concrete includes cement, fine aggregate, glass fiber, fly ash, a water reducing agent, a water-retaining agent,nano SiO2 according to the ratio of 100:100-120:2.0-2.5:15-25:0.5-1.5:0.10-0.15:5-7. The preparation method includes: 1) according to the ratio, weighing the raw materials and water; 2) adding the water reducing agent and nano SiO2 to a part of water and performing ultrasonic vibration continuously to form a water solution; 3) blending and stirring the cement, the rest of water, the fine aggregate, and the fly ash to form mortar; 4) adding the glass fibers, the water-retaining agent and the water solution in step 2) to the mortar and uniformly stirring the components. The sprayed concrete is high in whole life strength, is not liable to crack and has good interfacial adhesion performance. The sprayed concrete can be applied to the fields of underground construction supporting, reinforcement of buildings, and protective engineering.

Description

Technical field [0001] The invention patent discloses a sprayed concrete and a preparation method thereof, and belongs to the field of civil engineering materials. Background technique [0002] Shotcrete is a kind of concrete that uses compressed air or other power and spray machinery to transport a certain proportion of mixed materials through a pipeline and spray it on the sprayed surface at a high speed to set and harden. When spraying from the nozzle at high speed, cement particles and aggregate particles will continue to collide repeatedly, so the concrete can be compacted without vibration. At the same time, the sprayed concrete uses a relatively small amount of water and dust, which can further improve its compactness, thereby having higher mechanical strength and good durability. Due to the characteristics of its materials and processes, sprayed concrete is currently widely used in the fields of underground engineering support, building reinforcement and protection engin...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/06
CPCC04B28/04C04B28/06C04B14/06C04B14/42C04B18/08C04B2103/302C04B2103/465
Inventor 佘伟张云升
Owner SOUTHEAST UNIV
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