Composite retarder suitable for magnesium phosphate cement

A composite retarder and magnesium phosphate cement technology, applied in the field of building materials, can solve problems such as steel corrosion, and achieve the effect of prolonging construction time and meeting strength requirements

Active Publication Date: 2021-12-31
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of the above two composite retarders contain chloride salts, which have a corrosive effect on steel, so there are certain limitations in use.

Method used

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  • Composite retarder suitable for magnesium phosphate cement
  • Composite retarder suitable for magnesium phosphate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A composite retarder suitable for magnesium phosphate cement is composed of the following components in parts by weight: 50 parts of borax, 45 parts of malic acid and 5 parts of urea.

Embodiment 2

[0024] A composite retarder suitable for magnesium phosphate cement consists of the following components in parts by weight: 50 parts of borax, 45 parts of sodium malate and 5 parts of urea.

Embodiment 3

[0026] A composite retarder suitable for magnesium phosphate cement consists of the following components in parts by weight: 50 parts of borax, 40 parts of malic acid and 10 parts of urea.

[0027] Adopt the retarder of comparative example 1-4 and embodiment 1-3 to prepare magnesium phosphate cement material, method is as follows: the specific surface area is 2320cm 2 Mix 360 parts of magnesium oxide / g, 36 parts of retarder, and 57.6 parts of water, and then add 120 parts of potassium dihydrogen phosphate, and stir evenly to obtain magnesium phosphate cement material.

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Abstract

The invention discloses a composite retarder suitable for magnesium phosphate cement, and belongs to the technical field of building materials. The composite retarder is composed of the following components in parts by weight: 40-55 parts of borax, 40-50 parts of malic acid or malate and 5-10 parts of urea. The composite retarder has a good retarding effect on magnesium phosphate cement, the setting time of the magnesium phosphate cement is greatly prolonged, and the compressive strength of the prepared magnesium phosphate cement is higher than that of borax with the same mixing amount, so that the cement can meet the construction time requirement and can also meet the strength requirement, and the retarder is a high-quality retarder with both setting time and strength, and does not contain chlorine salt.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a composite retarder suitable for magnesium phosphate cement. [0002] technical background [0003] Magnesium phosphate cement (MPC) is a new type of hydraulic cementitious material that hardens rapidly through acid-alkali reaction and physical action after adding water. It has the characteristics of short setting time and high early strength, and can be applied to quickly repair local damage of buildings Or the part where the structure fails, it has good compatibility and bonding with the old concrete, and its frost resistance and volume stability are also better than portland cement. However, in the application of magnesium phosphate cement, due to its fast setting time, high consistency and poor operability during construction, it has certain limitations in use. [0004] Adding a retarder can not only increase the setting time of the magnesium phosphate...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B24/12C04B12/02C04B103/22
CPCC04B40/0039C04B12/02C04B2103/22C04B22/0013C04B24/06C04B24/126
Inventor焦宝祥高宇航孟长邹翔徐海笑韩俊哲
OwnerYANCHENG INST OF TECH