Molding method of high-density and low-porosity concrete

A molding method and concrete technology, applied in the direction of ceramic molding machines, manufacturing tools, etc., can solve the problems of uncompacted concrete, poor performance of concrete mixture, and affecting the safe use of concrete structures, so as to achieve good compactness, improve mechanical properties and The effect of durability

Active Publication Date: 2018-03-20
SHANGHAI RES INST OF BUILDING SCI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The vibrating and compacting of concrete is an important link in the concrete production process. The traditional vibrating and compacting method has a relatively rough process, which is prone to honeycomb, holes, pockmarks, etc., which seriously affects the safe use of concrete structures.
The reasons mainly include the following reasons: (1), the performance of the concrete mixture is poor, the vibration method and process are unreasonable, and the concrete is not dense; (2), the air-entraining phenomenon of the concrete admixture is serious, which leads to The material contains a large number of cl

Method used

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  • Molding method of high-density and low-porosity concrete
  • Molding method of high-density and low-porosity concrete
  • Molding method of high-density and low-porosity concrete

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Experimental program
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Embodiment 1

[0024] In order to achieve the nuclide transfer coefficient of concrete ≤ 1.0×10 -3 cm 2 / d, C80 high-strength and high-performance concrete material was developed by using a low water-binder ratio and a three-mixing system of fly ash, mineral powder, and silica fume mineral admixtures. The concrete with this ratio has better durability and impermeability protrude. In order to ensure that the nuclide transfer coefficient index cannot meet the specified requirements due to large defects introduced during the concrete forming process or the size of the pores is too large, the formed concrete specimen (specimen size Ф100mm×50mm) is required to be free of defects such as honeycombs and holes , the maximum pore diameter of the pores is less than or equal to 1mm, and the measured porosity is less than or equal to 7%.

[0025] Three methods were used for compact molding, and the molding effects were compared: molding method 1 is to mix C80 high-strength and high-performance concret...

Embodiment 2

[0033] The high-performance concrete materials used for hazardous waste disposal containers require concrete to have high durability. Usually, the concrete is required to meet the service life of more than 100 years or even 300 years. Therefore, it is more important to vibrate and compact concrete containers during the pouring process and should be avoided There are more obvious honeycombs, holes and pockmarks on the surface. The surface compactness of concrete containers made by two molding methods is given here. Forming method A is to place the mold on a vibrating table to form a container by vibration; forming method B is to pour in three layers according to the high-density and low-porosity concrete forming process described in the present invention, and repeatedly vibrate, insert and tamp to form the container.

[0034] Observe the compactness of the surface of the concrete container formed by the two molding methods. From the actual production effect of the concrete cont...

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Abstract

The invention discloses a molding method of high-density and low-porosity concrete. The molding method comprises the following steps : (1) adopting the total mass of the concrete as a reference, adding 0.05%-0.1% of a powder defoaming agent into the concrete, adjusting the use amount of a water reducing agent to control the slump of the concrete to 30-120mm, and controlling stirring time; (2) placing a test mold on a vibrating platform, pouring newly-stirred concrete into the test mold by two or more layers; (3) at every completion of pouring of one layer, starting the vibrating platform for vibration till defects in the concrete are filled, and discharging macroscopic bubbles; (4) stopping the vibrating platform, carrying out inserting and tamping on the concrete, wherein inserting and tamping are performed once at every 100-150mm in the form of a rectangular lattice; starting the vibrating platform after all parts of the concrete layer are inserted and tamped, vibrating till the concrete is dense and a surface is smooth; (5) repeating the steps (3) and (4) till the concrete is poured completely, and when the concrete above a second layer is inserted and tamped, inserting an inserting and tamping head to a position 0.1m below the surface of the former layer of concrete.

Description

technical field [0001] The invention belongs to the technical field of high-performance concrete preparation, and in particular relates to a molding method of high-density and low-porosity concrete (product). Background technique [0002] Concrete vibrating and compacting is an important link in the concrete production process. The traditional vibrating and compacting method has a relatively rough process, which is prone to honeycomb, holes, pockmarks and other phenomena, which seriously affects the safe use of concrete structures. The reasons mainly include the following reasons: (1) The performance of the concrete mixture is poor, the vibration method and process are unreasonable, and the concrete is not dense; (2) The air-entraining phenomenon of the concrete admixture is serious, which leads to the failure of the concrete mixing The material contains a large number of closed pores, which cannot be effectively eliminated. When the amount of admixture is too large, new air...

Claims

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Application Information

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IPC IPC(8): C04B28/02B28B1/087B28B1/093C04B111/20C04B111/90
CPCB28B1/0873B28B1/0935C04B28/02C04B2111/20C04B2111/90C04B2201/50C04B18/141C04B18/08C04B18/146C04B14/06C04B14/02C04B2103/302C04B2103/50
Inventor 樊俊江於林锋王琼韩建军
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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