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 sto

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

Example Embodiment

[0012] Example 1

[0013] To meet the requirements of the RCC mix ratio design requirements in the "Hydraulic RCC Construction Specification" (DL / T5112-2009), the water-binder ratio is 0.30, the machine mouth RCC VC value is 2s, and the secondary sand ratio is 32 %, the third-level sand distribution rate is 28%, and the amount of glue material is 130kg / m 3 Among the commonly used RCCs, the sand-coated stone mixing method is: use a forced mixer to mix in stages. When mixing, first put in the cementing material and sand, add the aqueous solution of the admixture and mix for 2 minutes, and then add the stone to mix for 1.5.

Example Embodiment

[0014] Example 2

[0015] The water-binder ratio that meets the design requirements of the RCC mix ratio in the "Hydraulic RCC Construction Specification" (DL / T5112-2009) is 0.45, the machine mouth RCC VC value is 5s, and the secondary sand ratio is 38 %, the third-level sand distribution rate is 33%, and the amount of glue material is 240kg / m 3 Among the commonly used RCC, the mortar-coated stone mixing method is: use a forced mixer to mix in stages, first put in cement, fly ash, and sand when mixing, add an aqueous solution of additives, and mix for 2 minutes, and then add stone to mix 1.5min.

Example Embodiment

[0016] Example 3

[0017] To meet the requirements of the RCC mix ratio design requirements in the "Hydraulic RCC Construction Specification" (DL / T5112-2009), the water-binder ratio is 0.65, the machine mouth RCC VC value is 8s, and the secondary sand ratio is 43 %, the third-level sand distribution rate is 38%, and the amount of glue material is 350kg / m 3 The commonly used roller compacted concrete, the method of mixing with sand-coated stone is: use a forced mixer to mix in stages. When mixing, first put in the cementitious material and sand, add the aqueous solution of the admixture and mix for 3 minutes, then add the stone to mix for 3.0 minutes. .

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

[0019] 1. R&D ideas

[0020] The mortar-wrapped stone method proposed by the present invention starts from the principle of introducing air bubbles into the air-entraining agent, changes the feeding sequence and mixing time of the rolle...

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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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