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Cement mortar for inner liner of centrifugal ductile iron pipe

A centrifugal ductile iron and cement mortar technology, which is applied in the field of metallurgical production, can solve the problem of the peeling resistance of the inner lining and the decrease in the adhesion strength of the inner lining and the inner wall of the ductile iron pipe, the decrease in the strength of the inner lining of the centrifugal ductile iron pipe, and the cement mortar and ductile iron pipe. Workability and plasticity deterioration and other problems, to achieve the effect of improving strength and adhesion, improving competitiveness, and improving mechanical properties

Inactive Publication Date: 2011-02-16
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to ensure fluidity, a large amount of water must be added, which will cause the workability and plasticity of cement mortar to deteriorate, and directly affect the strength of the final lining layer.
At present, the ingredient composition of cement mortar is calculated as cement: sand: water = 1: (1.0-1.5): (0.4-0.6) in terms of parts by weight. The strength of the lining layer decreases, which in turn reduces the peel strength of the lining layer itself and the adhesion strength between the lining layer and the inner wall of the ductile iron pipe.

Method used

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  • Cement mortar for inner liner of centrifugal ductile iron pipe
  • Cement mortar for inner liner of centrifugal ductile iron pipe

Examples

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Effect test

Embodiment 1

[0008] A cement mortar for the inner liner of centrifugal ductile iron pipes, the ratio of components by weight is: cement:sand:water:water reducer=1:1.0:0.25:0.008. The water reducer is a chlorine ion-free polycarboxylate high-performance water reducer produced by Hengsheng Concrete Admixture Co., Ltd. in Handan City, Hebei Province. Its appearance is light yellow liquid, with a pH value of 6-8 and a specific gravity of 1.06- 1.20g / cm 3 , Solid content 20%-40%. The water reducing agent is green and environment-friendly, has no corrosive effect on metals, does not require equipment modification during use, has a small amount of addition, is simple to operate, and has an obvious effect of improving the strength of the cement mortar lining layer. The cement mortar provided in this example is suitable for preparing the inner lining layer of a centrifugal ductile iron pipe with a nominal diameter of DN80.

Embodiment 2

[0010] The difference from Example 1 is that the cement mortar used for the inner liner of the centrifugal ductile iron pipe in this example has a ratio of parts by weight of each component: cement: sand: water: water reducer = 1: 1.5: 0.35:0.012. The cement mortar provided in this example is suitable for preparing the inner lining layer of a centrifugal ductile iron pipe with a nominal diameter of DN300.

Embodiment 3

[0012] A cement mortar for the inner liner of centrifugal ductile iron pipes, the ratio of components by weight is: cement:sand:water:water reducer=1:1.0:0.25:0.01. The water reducer is a sulfamate high-efficiency water reducer produced by Hunan Pioneer Building Materials Co., Ltd. The cement mortar provided in this example is suitable for preparing the inner lining layer of a centrifugal ductile iron pipe with a nominal diameter of DN80.

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Abstract

The invention discloses cement mortar for an inner liner of a centrifugal ductile iron pipe, which comprises the following components in parts by weight: 1 part of cement, 1.0-1.5 parts of sand, 0.25-0.35 parts of water and 0.0075-0.035 part of a water reducing agent. The cement mortar of the invention improves the strength of the inner liner of the centrifugal ductile iron pipe, the peel strength of the inner liner and the adhesive strength between the inner liner and the inner wall of the ductile iron pipe.

Description

technical field [0001] The invention relates to the technical field of metallurgical production, in particular to a batching of cement mortar for the lining layer of a centrifugal ductile iron pipe. Background technique [0002] The inner wall of the centrifugal ductile iron pipe is usually coated with a layer of cement mortar as the inner lining layer. The preparation of the inner lining layer is generally realized by the centrifugal lining process, which requires that the fluidity of the cement mortar is much higher than that of ordinary concrete. Otherwise, the distribution of cement mortar on the inner wall of the pipeline will be uneven, and the axial and radial thickness deviation of the inner lining will be large. But to ensure the fluidity, a large amount of water must be added, which will cause the workability and plasticity of the cement mortar to deteriorate, and directly affect the strength of the final inner lining. At present, the ingredient composition of cem...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/16C04B24/26C04B24/22C04B24/12
Inventor 韩书岭张永杰周庆志杨国华张洪涛綦晓平
Owner XINXING DUCTILE IRON PIPES CO LTD
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