A retarder suitable for sulphoaluminate cement

A technology of sulfoaluminate cement and setting retarder, applied in the field of setting retarder of sulfoaluminate cement, can solve problems such as the adverse effect of early strength of cement, and achieve the advantages of improving retarding effect, improving solubility and reducing surface tension. Effect

Inactive Publication Date: 2020-07-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, boric acid is mostly used as retarder in sulphoaluminate cement concrete, and the addition of boric acid will adversely affect the early strength of cement

Method used

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  • A retarder suitable for sulphoaluminate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-efficiency retarder suitable for sulphoaluminate cement, which is composed of the following raw materials in parts by weight: 30 parts of isobutylene diurea (IBDU), 2 parts of sodium dioctyl succinate sulfonate, methylene 2 parts of disodium dinaphthalene sulfonate, 1 part of nitrification inhibitor.

[0019] A high-efficiency retarder suitable for sulphoaluminate cement is prepared by the following steps:

[0020] (1) Put isobutylidene diurea and nitrification inhibitor in a ball mill, mix and ball mill, test the sieve residue with a 200-mesh square hole sieve, when the sieve residue is ≤5%, stop the ball milling to obtain material 1;

[0021] (2) Put sodium dioctyl succinate sulfonate and disodium methylene bis-naphthalene sulfonate in a ball mill, mix and ball mill for 5 minutes, then cool for 10 minutes, and test the sieve with a 200-mesh square hole sieve, when the sieve ≤15%, get material 2;

[0022] (3) Put material 1 and material 2 together in a mixer, ...

Embodiment 2

[0024] A high-efficiency retarder suitable for sulphoaluminate cement, which is composed of the following raw materials in parts by weight: 40 parts of isobutylene diurea (IBDU), 4 parts of sodium dioctyl succinate sulfonate, methylene Disodium dinaphthalene sulfonate 4, nitrification inhibitor 2 parts.

[0025] The preparation method is the same as in Example 1.

Embodiment 3

[0027] A high-efficiency retarder suitable for sulphoaluminate cement, which is composed of the following raw materials in parts by weight: 50 parts of isobutylene diurea (IBDU), 6 parts of sodium dioctyl succinate sulfonate, methylene bis Disodium naphthalenesulfonate 6, nitrification inhibitor 3 parts.

[0028] The preparation method is the same as in Example 1.

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Abstract

The invention provides a retarder applicable to sulphoaluminate cement. The retarder is prepared from raw materials in parts by weight as follows: 30-70 parts of isobutylidene-diurea, 10-20 parts of adispersing agent and 1-5 parts of a nitrification inhibitor. With the adoption of the prepared sulphoaluminate cement retarder, initial setting time can be prolonged to 76 min, final setting time is103 min, and compared with the initial setting time being 10 min of a conventional cement retarder, the retarder makes impressive progress.

Description

technical field [0001] The invention relates to a retarder, in particular to a retarder suitable for sulphoaluminate cement. Background technique [0002] Sulphoaluminate cement has the characteristics of low alkalinity, fast hydration hardening speed, and high strength, making it more suitable for the preparation of porous ecological concrete. However, because sulfoaluminate cement belongs to the fast-hardening and early-strength special cement, its setting time is short, which causes difficulties in construction. In order to ensure normal construction, prolong the hydration and hardening time of cement, and make fresh concrete maintain plasticity for a long time, retarders must be used. At present, boric acid is mostly used as retarder in sulphoaluminate cement concrete, and the addition of boric acid will adversely affect the early strength of cement. Therefore, it is necessary to develop a new retarder suitable for sulphoaluminate cement. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/20C04B24/12C04B24/16C04B103/22
CPCC04B40/0039C04B2103/22C04B24/124C04B24/16C04B24/20C04B24/128C04B28/06
Inventor 宫晨琛代文燕芦令超
Owner UNIV OF JINAN
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