A retarder suitable for sulphoaluminate cement

A technology of sulfoaluminate cement and retarder, applied in application, fertilizer mixture, fertilization device and other directions, can solve the problems of short setting time, low fertilizer efficiency and utilization rate, difficult construction and operation, etc., to improve fluidity and improve flow degree, the effect of prolonging the setting time

Active Publication Date: 2017-03-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its short setting time and fast hydration hardening time, construction operation is difficult
In order to prolong the setting time, boric acid is often used as a retarder to prolong its setting time. Boric acid has an obvious retarding effect on sulphoaluminate cement, but it has a bad effect on the compressive strength of cement hardened slurry.
In addition, the porous concrete skeleton prepared by using cement cannot provide nutrients for plants, it is difficult to topdress after greening, and the utilization rate of fertilizer is low

Method used

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  • A retarder suitable for sulphoaluminate cement

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] A retarder suitable for sulphoaluminate cement, which is composed of the following raw materials in parts by weight: 7 parts of urea, 11 parts of sodium lignosulfonate, 2 parts of sodium dinaphthylmethane disulfonate, and water reducer 2 parts, 70 parts of vermiculite.

[0023] As mentioned, the vermiculite is vermiculite powder, the fineness is 200 mesh, and the sieve residue is less than 10%.

[0024] As mentioned above, sodium lignosulfonate is yellow-brown powder, the content of sodium lignosulfonate is >45%, and the sieve residue is ≤4%.

[0025] As mentioned, the water reducer is an aliphatic high-efficiency water reducer.

[0026] As mentioned above, the aliphatic high-efficiency water reducer is a powder, and the effective matter content is ≥ 92%.

[0027] Usage method: mix the above raw materials evenly, add to the mixing water, fully stir to dissolve and disperse, and mix with cement according to the addition amount of 5.9% of the weight of sulphoaluminate c...

Embodiment 2

[0029] A retarder suitable for sulphoaluminate cement, which is composed of the following raw materials in parts by weight: 20 parts of urea, 9 parts of sodium lignosulfonate, 5 parts of sodium dinaphthylmethane disulfonate, and water reducer 3 parts, 60 parts of vermiculite.

[0030] All the other are with embodiment 1.

Embodiment 3

[0032] A retarder suitable for sulphoaluminate cement, which is composed of the following raw materials in parts by weight: 30 parts of urea, 7 parts of sodium lignosulfonate, 4 parts of sodium dinaphthyl methane disulfonate, and water reducer 3.5 parts, 50 parts of vermiculite.

[0033] All the other are with embodiment 1.

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Abstract

The invention discloses retarder applicable to sulphate aluminum cement. The retarder is composed of, by weight, 7-60 parts of carbamide, 3-11 parts of sodium lignin sulfonate, 2-7 parts of dinaphthyl methane disulfonic acid sodium, 2-5 parts of water reducing agent and 30-70 parts of vermiculite. By means of the retarder, the coagulation speed of the sulphate aluminum cement can be effectively reduced, the flowability of sulphate aluminum cement slurry can be remarkably improved, and the water demand in the sulphate aluminum cement mixing process can be reduced. The carbamide is added into the retarder, the coagulation time of the sulphate aluminum cement can be prolonged, nitrogen nutrient elements required by the plant growth can be further released slowly after the cement slurry is hardened, and the nitrogen nutrient elements are supplied to plants in porous plant-growing concrete for meeting the plant growth requirements.

Description

technical field [0001] The invention belongs to the field of cement admixtures, in particular to a retarder suitable for sulphoaluminate cement. Background technique [0002] In order to prolong the hydration and hardening time of cement, a retarder is often added to the concrete, so that the fresh concrete can maintain plasticity for a long time, thereby adjusting the setting time of the fresh concrete. 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, due to its short setting time and fast hydration hardening time, construction operation is difficult. In order to prolong the setting time, boric acid is often used as a retarder to prolong its setting time. Boric acid has an obvious retarding effect on sulphoaluminate cement, but it has a negative effect on the compressive strength of cement hardened slurry. In addition, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/20C05G3/00C04B103/22
Inventor 宫晨琛黄庆亮芦令超王守德程新
Owner UNIV OF JINAN
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