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Method for arch dam fast construction by externally mixing MgO slightly expanded concrete

A micro-expansion concrete and concrete technology, applied in the field of construction, can solve the problems such as the limitation of promotion and application, the lack of specifications for design and construction, and achieve a wide range of adaptation conditions and scope, significant economic and social benefits, and improve compensation and crack resistance. Effect

Inactive Publication Date: 2007-02-07
GUIZHOU ZHONGSHUI CONSTR PROJECT MANAGEMENTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is mainly used in non-main projects such as: stone pond apron, backfilling of deep grooves of dam foundation, filling ponds and plugging holes, diversion tunnel plugging, backfilling of high-pressure pipeline periphery; it is partially or fully used in main projects such as gravity dam restricted areas In terms of design and construction, there is no standard to follow, and the design understanding of the new deformation characteristics of the MgO-doped arch dam is still in the groping stage, which limits the popularization and application of this technology

Method used

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  • Method for arch dam fast construction by externally mixing MgO slightly expanded concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: 3m layer

[0018] Preparation of lightly calcined MgO: calcining magnesite with MgO content > 44% to 1100±50°C, holding time 0.5h, activity index 240±20s, particle size 180-250 mesh.

[0019] (1) Batching: batching according to cement 119Kg: sand 538Kg: extra large stone 551Kg: big stone 551Kg: medium stone 340Kg: small stone 340Kg: fly ash 51Kg: MgO9.35Kg: water reducing agent 1.7Kg: water 85Kg;

[0020] (2) mixing:

[0021] The MgO feeding control adopts the "wet mixing" method to add, and the weighing error is less than 1%. A set of MgO automatic stirring device is installed. This device is mainly arranged in the water bucket. When the MgO is fed and weighed by the screw machine, it is automatically added Into the weighed water tank, the mixer starts to stir at this time. The admixture (water reducer) is adjusted to a suspension by adding water in a conventional proportion, weighed and poured into the bucket. Stir together with MgO for 60s and then mix ...

Embodiment 2

[0027] The preparation of lightly burned MgO: with embodiment 1

[0028] (1) Batching: According to cement 119Kg: sand 538Kg: extra large stone 551Kg: big stone 551Kg: medium stone 340Kg: small stone 340Kg: fly ash 51Kg: MgO6.8Kg: water reducing agent 1.7Kg: water 85Kg;

[0029] (2) mixing:

[0030] The MgO feeding control adopts the "wet mixing" method to add, and the weighing error is less than 1%. A set of MgO automatic stirring device is installed. This device is mainly arranged in the water bucket. When the MgO is fed and weighed by the screw machine, it is automatically added Into the weighed water tank, the mixer starts to stir at this time. The admixture (water reducer) is adjusted to a suspension by adding water in a conventional proportion, weighed and poured into the bucket. Stir together with MgO for 60s and then mix into a homogeneous suspension.

[0031] Put the weighed extra large stone, large stone, medium stone, small stone, sand, ordinary silicon 525 cemen...

Embodiment 3

[0036] The preparation of lightly burned MgO: with embodiment 1

[0037] (1) Batching: According to cement 119Kg: sand 538Kg: extra large stone 551Kg: big stone 551Kg: medium stone 340Kg: small stone 340Kg: fly ash 51Kg: MgO10.2Kg: water reducing agent 1.7Kg: water 85Kg;

[0038] (2) mixing:

[0039]The MgO feeding control adopts the "wet mixing" method to add, and the weighing error is less than 1%. A set of MgO automatic stirring device is installed. This device is mainly arranged in the water bucket. When the MgO is fed and weighed by the screw machine, it is automatically added Into the weighed water tank, the mixer starts to stir at this time. The admixture (water reducer) is adjusted to a suspension by adding water in a conventional proportion, weighed and poured into the bucket. Stir together with MgO for 60s and then mix into a homogeneous suspension.

[0040] Put the weighed extra large stone, large stone, medium stone, small stone, sand, ordinary silicon 525 cemen...

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Abstract

The invention relates to a method for quickly constructing arch dam with external doping MgO micro-expand concrete, wherein it comprises: (1), preparing materials; (2), mixing MgO, sand, cement and powder coal as 4-6% of whole weight; (3) externally doping MgO concrete; it quickly continuously pours concrete, uses step rolling, and cycled method, while the layer height of dam is controlled between 2.5-3m, and the cycle time of each layer is 5-7 days, each layer has 5-6 steps, and the thickness of laid material is 30-50cm; it uses high-frequency vibrator, via step method to continuously pour, while the connect surface is 45-60degress incline, and the width of bar band is 2-3m.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a method for quickly building an arch dam. Background technique [0002] As we all know, ordinary concrete has many advantages, so it is widely used as a main building material, but its biggest shortcoming is that it is prone to shrinkage and cracking when cooling down, which often causes leakage and corrosion of steel bars, which affects its function and life. affected. Cracks in concrete dams and their prevention and control have always been a major technical issue of great concern to engineering circles. The temperature control measures and methods of traditional conventional arch dam construction: transverse joints, columns, jumping blocks, thin layers, long intermittent pouring, pre-embedded water pipe cooling, arch sealing grouting, etc. are required. The cross-operation of vertical formwork and pouring will interfere with each other, and the arch sealing and grout...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B7/02E02D15/00E02D17/18
Inventor 李承木杨卫中张国新杨朝晖帅文申献平郑国旗陈学茂赵其兴袁天国
Owner GUIZHOU ZHONGSHUI CONSTR PROJECT MANAGEMENTCO
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