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A novel prestressed cement stabilized slurry and its manufacturing method

A cement stabilization and manufacturing method technology, applied in the field of new prestressed cement stabilization slurry and its manufacture, prestressed large curvature and large height difference pipeline grouting, and other construction engineering prestressed system grouting materials, can solve the problem of volumetric steel strands Relaxation, not conducive to product protection and environmental protection, cumbersome construction process and other problems, to achieve the effect of excellent performance

Active Publication Date: 2020-11-10
CHINA NUCLEAR IND HUAXING CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The use of retarded cement paste supplemented by expanded cement paste leads to cumbersome construction process, which is not conducive to the protection of finished products and environmental protection, and is not conducive to the quality control of the construction process
Using thixotropic cement paste, the paste will solidify rapidly due to the large torque force of the paste during the construction process, especially when the disturbance is stopped, which increases the difficulty of equipment pump pressure and construction organization, and is not conducive to the quality control of the construction process;
[0004] 2. The fluidity of the cement slurry used for pouring is unstable, and the shrinkage and bleeding are as small as possible
Because the fluidity is unstable and the bleeding of the cement paste will form holes in the prestressed channel, which may become a channel for the intrusion of external harmful media, which will corrode the steel strands and affect the durability of the prestressing system. At the same time, the bleeding of the cement paste And the instability of the volume will cause the cement paste to shrink and lead to the risk of loosening of the steel strands

Method used

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  • A novel prestressed cement stabilized slurry and its manufacturing method
  • A novel prestressed cement stabilized slurry and its manufacturing method
  • A novel prestressed cement stabilized slurry and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Prepare raw materials according to the following components and mass content: Portland cement: 500kg; water: 150kg; superplasticizer: 14.5kg; retarder: 2.00kg; stabilizer: 0.0600kg;

[0036] 2) First add water into the slurry mixing tank, then add high-efficiency water reducer and stir for 10 seconds at a speed of (2500±500) rpm;

[0037] 3) Add 150kg of Portland cement (30% cement) and stir for 5 seconds at a speed of (2500±500) rpm;

[0038] 4) Add a stabilizer and stir for 5 seconds at a speed of (2500±500) rpm;

[0039] 5) Add 350kg of Portland cement (70% cement) and stir for 5 seconds at a speed of (2500±500) rpm;

[0040] 6) Continue to stir for 4 minutes at the speed of rotating speed (2500±500) rev / min;

[0041] 7) Stop stirring and let stand for 45 minutes;

[0042] 8) Continue to stir for 15 seconds at the speed of rotating speed (1500±500) rev / min;

[0043] 9) Add retarder and stir for 5 seconds at a speed of (1500±500) rpm;

[0044] 10) Continue to ...

Embodiment 2

[0049] 1) Prepare raw materials according to the following components and mass content: Portland cement: 500kg; water: 165kg; superplasticizer: 11.5kg; retarder: 2.50kg; stabilizer: 0.0660kg;

[0050] 2) First add water into the slurry mixing tank, then add high-efficiency water reducer and stir for 10 seconds at a speed of (2500±500) rpm;

[0051] 3) Add 150kg of Portland cement (30% cement) and stir for 5 seconds at a speed of (2500±500) rpm;

[0052] 4) Add a stabilizer and stir for 5 seconds at a speed of (2500±500) rpm;

[0053] 5) Add 350kg of Portland cement (70% cement) and stir for 5 seconds at a speed of (2500±500) rpm;

[0054] 6) Continue to stir for 4 minutes at the speed of rotating speed (2500±500) rev / min;

[0055] 7) Stop stirring and let stand for 45 minutes;

[0056] 8) Continue to stir for 15 seconds at the speed of rotating speed (1500±500) rev / min;

[0057] 9) Add retarder and stir for 5 seconds at a speed of (1500±500) rpm;

[0058] 10) Continue to ...

Embodiment 3

[0064] 1) Prepare raw materials according to the following components and mass content: Portland cement: 500kg; water: 180kg; superplasticizer: 10.0kg; retarder: 3.00kg; stabilizer: 0.0875.

[0065] 2) First add water into the slurry mixing tank, then add high-efficiency water reducer and stir for 10 seconds at a speed of (2500±500) rpm;

[0066] 3) Add 150kg of Portland cement (30% cement) and stir for 5 seconds at a speed of (2500±500) rpm;

[0067] 4) Add a stabilizer and stir for 5 seconds at a speed of (2500±500) rpm;

[0068] 5) Add 350kg of Portland cement (70% cement) and stir for 5 seconds at a speed of (2500±500) rpm;

[0069] 6) Continue to stir for 4 minutes at the speed of rotating speed (2500±500) rev / min;

[0070] 7) stop stirring, let stand for 45 minutes;

[0071] 8) Continue to stir for 15 seconds at the speed of rotating speed (1500±500) rev / min;

[0072] 9) Add retarder and stir for 5 seconds at a speed of (1500±500) rpm;

[0073] 10) Continue to stir fo...

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Abstract

The invention discloses novel pre-stressed cement stabilization slurry and a preparation method thereof. The novel pre-stressed cement stabilization slurry is prepared by mixing the following components of Portland cement, a superplasticizer, a retarder, a stabilizer and water in a mass proportion through a certain stirring mode, wherein the mass proportion of the Portland cement to the superplasticizer to the retarder to the stabilizer to the water is 1 to 0.023 to 0.005 to 0.000132 to 0.33. The novel pre-stressed cement stabilization slurry prepared by mixing the components in the mass proportion has good properties of low water bleeding and low shrinkage, and the problems that after pre-stressed engineering tension, stress relaxation is caused by shrinkage, and an exterior harmful medium invasion passage is formed in a duct after water bleeding and grouting can be solved; the novel pre-stressed cement stabilization slurry can be used for primary grouting of a pre-stressed large-curvature large-difference pipeline, so that the working efficiency and the construction quality of grouting can be greatly increased.

Description

technical field [0001] The invention belongs to the technical field of building construction, and specifically relates to a novel prestressed cement stabilized slurry and a manufacturing method thereof. The slurry is used for grouting prestressed pipelines in nuclear power plants, and is also suitable for grouting all types of prestressed pipelines, especially for large prestressed pipelines. It is also suitable for grouting materials for prestressed systems in other construction projects. Background technique [0002] The containment prestressing system of the nuclear power plant reactor building generally adopts post-tensioning, and its steel beam arrangement is basically divided into two types: horizontal beams and vertical beams, and cement slurry is poured after tensioning. At present, there are two main types of cement paste for grouting. One is to use retarded cement paste supplemented with expanded cement paste. When this type of paste is used for grouting pipelines ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/70
CPCC04B28/04C04B2111/70C04B2201/52C04B2103/302C04B2103/22C04B2103/0068C04B40/0028
Inventor 梁权刚杨浩崔正严钱伏华沈益军别海亮
Owner CHINA NUCLEAR IND HUAXING CONSTR