Efficient retarder and preparation method thereof

Abstract

The application relates to the technical field of concrete additive, and discloses a high-efficiency retarder and a preparation method thereof. The high-efficiency retarder comprises the following components in parts by mass: inorganic salt 10-20 parts, hydroxyl carboxylic acid 10-20 parts, sugar 5-10 parts, additive 8-15 parts, and water 40-60. The additive comprises p-hydroxyphenylacetamide and / or 1-naphthol-5-sulfonic acid. Through the technical scheme, the problem that the retarding time of the retarder in the prior art is limited and the early strength of concrete is low is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete additive, in particular, relates to a kind of high-efficiency retarder and preparation method thereof. BACKGROUND

[0002] Retarder is a common additive of concrete, can prolong the setting time of concrete, by adjusting the initial / setting time of fresh concrete, make concrete keep plasticity in a long time;It can also delay the hydration heat release rate, reduce the temperature stress caused by concentrated heat release, and prevent concrete structure from cracking, and improve the compactness of concrete and durability.

[0003] Retarder can be divided into ordinary retarder and super retarder according to its retardation time;It can be divided into inorganic retarder and organic retarder according to its chemical composition. Inorganic retarder includes phosphate, zinc salt, ferric sulfate, copper sulfate, fluorosilicate, etc., by reacting with concrete, a kind of insoluble film is generated on the surface of concrete, to delay the setting time of concrete;Organic retarder includes hydroxyl carboxylic acid and its salt, polyol and its derivative, sugar, etc., by adsorbing on the surface of concrete, and can also adsorb on new substances in the process of cement hydration and hardening, so as to keep stable, so as to change the internal structure of crystal. Although the existing retarder has certain effect, but the retardation time is limited, and the early strength of concrete is affected. SUMMARY

[0004] The present application provides a kind of high-efficiency retarder and preparation method thereof, solve the problem of limited retardation time of retarder in related technology and low early strength of concrete.

[0005] The technical scheme of the present application is as follows:

[0006] A kind of high-efficiency retarder, including the following components by mass fraction: inorganic salt 10~20 parts, hydroxyl carboxylic acid 10~20 parts, sugar 5~10 parts, additive 8~15 parts, water 40~60;

[0007] The additive includes p-hydroxyphenylacetamide and / or 1-naphthol-5-sulfonic acid.

[0008] As a further technical scheme, the additive includes p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid with mass ratio of 5:5~3:7.

[0009] As a further technical scheme, the additive includes p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid with mass ratio of 1:1.5.

[0010] As a further technical scheme, the inorganic salt includes one or more of ferric sulfate, copper sulfate and trisodium phosphate.

[0011] As a further technical solution, the hydroxyl carboxylic acid comprises one or more of salicylic acid, malic acid, citric acid, and tartaric acid.

[0012] As a further technical solution, the sugar comprises one or more of glucose, molasses, and sucrose.

[0013] As a further technical solution, the components include the following mass parts: 15 parts of trisodium phosphate, 15 parts of salicylic acid, 5 parts of molasses, 3 parts of sucrose, 4 parts of p-hydroxyphenylacetamide, 6 parts of 1-naphthol-5-sulfonic acid, and 50 parts of water.

[0014] The application further provides a preparation method of the high-efficiency retarder, which comprises the following steps: uniformly mixing the components to obtain the high-efficiency retarder.

[0015] As a further technical solution, the mixing temperature is 30-50 DEG C, and the mixing time is 20-30 min.

[0016] The application further provides application of the high-efficiency retarder or the high-efficiency retarder prepared by the preparation method in concrete.

[0017] The working principle and beneficial effects of the application are as follows:

[0018] 1. The application provides a high-efficiency retarder, which uses p-hydroxyphenylacetamide and / or 1-naphthol-5-sulfonic acid as an additive, thereby prolonging the setting time of concrete and improving the early compressive strength of concrete.

[0019] 2. The application limits the additive to p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid in a mass ratio of 5:5-3:7, thereby further prolonging the setting time of concrete and improving the early compressive strength of concrete. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative efforts are within the protection scope of the application.

[0021] Embodiment 1

[0022] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, p-hydroxyphenylacetamide 10 parts, and water 50 parts are stirred at 40 DEG C for 25 min until uniform, thereby obtaining a high-efficiency retarder.

[0023] Embodiment 2

[0024] Iron sulfate 10 parts, citric acid 5 parts, malic acid 5 parts, glucose 5 parts, p-hydroxyphenylacetamide 8 parts, water 40 parts were stirred at 30°C for 30 min to be uniform, to obtain a high efficiency retarder.

[0025] Example 3

[0026] Copper sulfate 15 parts, trisodium phosphate 5 parts, tartaric acid 20 parts, sucrose 10 parts, p-hydroxyphenylacetamide 15 parts, water 60 parts were stirred at 50°C for 20 min to be uniform, to obtain a high efficiency retarder.

[0027] Example 4

[0028] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, 1-naphthol-5-sulfonic acid 10 parts, water 50 parts were stirred at 40°C for 25 min to be uniform, to obtain a high efficiency retarder.

[0029] Example 5

[0030] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, p-hydroxyphenylacetamide 6 parts, 1-naphthol-5-sulfonic acid 4 parts, water 50 parts were stirred at 40°C for 25 min to be uniform, to obtain a high efficiency retarder.

[0031] Example 6

[0032] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, p-hydroxyphenylacetamide 5 parts, 1-naphthol-5-sulfonic acid 5 parts, water 50 parts were stirred at 40°C for 25 min to be uniform, to obtain a high efficiency retarder.

[0033] Example 7

[0034] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, p-hydroxyphenylacetamide 4 parts, 1-naphthol-5-sulfonic acid 6 parts, water 50 parts were stirred at 40°C for 25 min to be uniform, to obtain a high efficiency retarder.

[0035] Example 8

[0036] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, p-hydroxyphenylacetamide 3 parts, 1-naphthol-5-sulfonic acid 7 parts, water 50 parts were stirred at 40°C for 25 min to be uniform, to obtain a high efficiency retarder.

[0037] Example 9

[0038] Trisodium phosphate 15 parts, salicylic acid 15 parts, molasses 5 parts, sucrose 3 parts, p-hydroxyphenylacetamide 2 parts, 1-naphthol-5-sulfonic acid 8 parts, water 50 parts were stirred at 40°C for 25 min to be uniform, to obtain a high efficiency retarder.

[0039] Comparative Example 1

[0040] The difference from Example 1 is only that p-hydroxyphenylacetamide is not added.

[0041] Performance test:

[0042] The high-efficiency retarder obtained in Example 1~9 and Comparative Example 1 is respectively added into concrete (PO42.5 ordinary portland cement 420kg / m 3 , first fly ash 80kg / m 3 , river sand with fineness modulus 2.2 700kg / m 3 , gravel meeting 0.5~2.5cm continuous gradation 1100kg / m 3 , water 160kg / m 3 ) at 40℃, and the addition amount of the retarder is 0.5% of the mass of the binder (cement and fly ash), the initial setting time and the final setting time are tested according to the method in GB / T 50080-2016 “Standard Test Methods for Properties of Fresh Ordinary Concrete”, the compressive strength is tested according to the method in GB / T 50081-2002 “Standard Test Methods for Mechanical Properties of Fresh Ordinary Concrete”, and the test results are recorded in Table 1.

[0043] Table 1 Initial setting time, final setting time and compressive strength

[0044]

[0045] As can be seen from Table 1, the initial setting time of the high-efficiency retarder provided by the application is more than 1675min, the final setting time is 1855min, and the 3-day compressive strength is more than 42.4MPa, which can greatly prolong the setting time of the concrete and improve the early compressive strength of the concrete.

[0046] Compared with Comparative Example 1, p-hydroxyphenylacetamide and / or 1-naphthol-5-sulfonic acid are added in Example 1~9, and are not added in Comparative Example 1, the initial setting time, the final setting time and the 3-day compressive strength of the retarder obtained in Example 1~9 are higher than those in Comparative Example 1, which shows that adding p-hydroxyphenylacetamide and / or 1-naphthol-5-sulfonic acid can prolong the setting time of the concrete and improve the early compressive strength of the concrete.

[0047] Compared with examples 5-9, in examples 1-3, p-hydroxyphenylacetamide is added, in example 4, 1-naphthol-5-sulfonic acid is added, in examples 5-9, p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid are added, the initial setting time, final setting time and 3-day compressive strength of the retarder obtained in examples 5-9 are higher than those in examples 1-4. It is illustrated that p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid have a synergistic effect, can greatly prolong the setting time of concrete and significantly improve the early compressive strength of concrete.

[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-efficiency retarder, characterized in that, The components include the following parts by weight: 10-20 parts inorganic salt, 10-20 parts hydroxycarboxylic acid, 5-10 parts sugar, 8-15 parts additives, and 40-60 parts water; The additives include p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid in a mass ratio of 5:5 to 3:

7.

2. The high-efficiency retarder according to claim 1, characterized in that, The additives include p-hydroxyphenylacetamide and 1-naphthol-5-sulfonic acid in a mass ratio of 1:1.

5.

3. The high-efficiency retarder according to claim 1, characterized in that, The inorganic salts include one or more of ferric sulfate, copper sulfate, and trisodium phosphate.

4. The high-efficiency retarder according to claim 1, characterized in that, The hydroxycarboxylic acid includes one or more of salicylic acid, malic acid, citric acid, and tartaric acid.

5. The high-efficiency retarder according to claim 1, characterized in that, The sugars include one or more of glucose, molasses, and sucrose.

6. The high-efficiency retarder according to claim 1, characterized in that, The components include the following parts by weight: 15 parts trisodium phosphate, 15 parts salicylic acid, 5 parts molasses, 3 parts sucrose, 4 parts p-hydroxyphenylacetamide, 6 parts 1-naphthol-5-sulfonic acid, and 50 parts water.

7. A method for preparing a high-efficiency retarder according to any one of claims 1 to 6, characterized in that, Includes the following steps: The components are mixed evenly to obtain a high-efficiency retarder.

8. The method for preparing a high-efficiency retarder according to claim 7, characterized in that, The mixing temperature is 30~50℃, and the time is 20~30min.

9. The application of the high-efficiency retarder as described in any one of claims 1 to 6 or the high-efficiency retarder prepared by the preparation method described in any one of claims 7 to 8 in concrete.

Images