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High frost resistance roller compacted concrete mortar wrapped stone mixing method

A technology of roller compacted concrete and high frost resistance, which is applied in the construction field of high frost resistance roller compacted concrete in cold regions, can solve the problem that the air content of high frost resistance roller compacted concrete cannot meet the requirements, and achieve the reduction of air-entraining agent dosage, Easy to control and increase the air content of RCC

Inactive Publication Date: 2012-09-12
CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a mixing method for high frost-resistant roller compacted concrete covered with mortar and stone, to solve the problem that the air content of high frost-resistant roller compacted concrete cannot meet the requirements

Method used

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  • High frost resistance roller compacted concrete mortar wrapped stone mixing method
  • High frost resistance roller compacted concrete mortar wrapped stone mixing method
  • High frost resistance roller compacted concrete mortar wrapped stone mixing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The water-cement ratio is 0.30, the VC value of the machine mouth RCC is 2s, and the secondary sand ratio is 32, which meets the design requirements of the "Hydraulic Roller Compacted Concrete Construction Code" (DL / T5112-2009). %, the three-stage sand mixing rate is 28%, and the amount of glue is 130kg / m 3 For commonly used roller compacted concrete, the mixing method of plastic sand wrapped in stone is: use a forced mixer to mix in sections, first put in cementitious materials and sand materials, add admixture aqueous solution and stir for 2 minutes, then add stones and stir for 1.5 minutes.

Embodiment 2

[0015] For the water-cement ratio of 0.45, the VC value of machine mouth RCC 5s, and the secondary sand ratio of 38, which meet the design requirements of the RCC mix ratio in the "Hydraulic Roller Compacted Concrete Construction Code" (DL / T5112-2009) %, the three-stage sand mixing rate is 33%, and the amount of glue is 240kg / m 3 The commonly used roller compacted concrete, the mixing method of plastic sand wrapped in stone is: using a forced mixer to mix in sections, when mixing, first put in cement, fly ash, sand, add admixture aqueous solution and stir for 2 minutes, then add stones and stir 1.5min.

Embodiment 3

[0017] For the water-cement ratio of 0.65, the VC value of machine-mouth RCC to be 8s, and the secondary sand ratio to be 43, which meet the design requirements of the RCC mix ratio in the "Hydraulic RCC Construction Code" (DL / T5112-2009) %, the three-stage sand mixing rate is 38%, and the amount of glue is 350kg / m 3 The commonly used roller compacted concrete, the mixing method of plastic sand wrapped stone is: use a forced mixer to mix in sections, when mixing, first put in cementitious material and sand, add admixture aqueous solution and stir for 3 minutes, then add stones and stir for 3.0 minutes .

[0018] The present invention will be described in detail below through specific test procedures.

[0019] 1. Research and development ideas

[0020] The mortar-wrapping method proposed by the present invention is based on the principle of air-entraining agent introducing air bubbles, changing the feeding sequence and mixing time of roller compacted concrete, and measuring t...

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Abstract

The invention relates to a high frost resistance roller compacted concrete mortar wrapped stone mixing method which is suitable for the field of construction of high frost resistance roller compacted concrete in a cold region. The high frost resistance roller compacted concrete mortar wrapped stone mixing method comprises the steps of: stirring by sections by adopting a forced stirring machine, firstly putting a binding material and a sand material during stirring, adding an additive water solution for stirring for 2min-3min, and then adding stone for stirring for 1.5min-3.0min. The method provided by the invention remarkably increases the gas content of roller compacted concrete, can be widely applied to a normal concrete mixing process, and has wide popularization and application values.

Description

technical field [0001] The invention is suitable for the construction field of high frost-resistant roller compacted concrete in cold regions. Background technique [0002] The frost resistance of low-strength concrete is related to the size and number of air bubbles in the concrete. There are a large number of disconnected but uniformly distributed micro-bubbles in the concrete, which can improve the frost resistance of the concrete. In order to meet the requirements of different frost resistance grades of concrete, the common treatment method is to greatly increase the amount of concrete air-entraining agent in the process of concrete mixing. Due to the advantages of low glue consumption, fast construction speed and low cost, the roller compacted concrete dam building technology has been rapidly promoted in southern my country, but the application of roller compacted concrete in the northern severe cold region is greatly restricted. The reason is that severe cold regions h...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C04B111/20
Inventor 王德库苏加林路振刚李艳萍张正平雷秀玲李正国崔金铁张志福杨成祝韩会生王福运刘忠富李中田黄如卉马智法隋伟毛春华王锐
Owner CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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