CN115259742B - Retarder for mortar, and preparation method, application method and application thereof - Google Patents
Retarder for mortar, and preparation method, application method and application thereof Download PDFInfo
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- CN115259742B CN115259742B CN202210803944.7A CN202210803944A CN115259742B CN 115259742 B CN115259742 B CN 115259742B CN 202210803944 A CN202210803944 A CN 202210803944A CN 115259742 B CN115259742 B CN 115259742B
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- mortar
- retarder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a retarder for mortar, and a preparation method, a use method and an application thereof, wherein the retarder for mortar comprises the following raw materials in parts by weight: 100-150 parts of sugar substances, 100-150 parts of citric acid, 400-500 parts of borax, 8-10 parts of hydroxypropyl methyl cellulose, 30-50 parts of anhydrous sodium sulfate and 600-800 parts of water, and the components are added into cement mortar in a synergistic effect, so that the hydration hardening speed of the cement mortar can be slowed down, and the early strength of cement can be improved.
Description
Technical Field
The invention relates to the technical field of retarders, in particular to a retarder for mortar, and a preparation method, a use method and an application thereof.
Background
In the construction engineering, the mortar is an indispensable part, and can be mainly classified into wet-mixed mortar, dry-mixed mortar, masonry mortar, plastering mortar, ground mortar, waterproof mortar, etc., while the wet-mixed mortar is the most used at the present stage.
In order to solve the problems of large waste, waste water, noise and the like generated in the stirring process of the on-site mortar, a professional stirring station is often adopted to transport the mortar to a use place after being stirred to be qualified, and the problems of rapid coagulation, low strength and the like of the mortar caused by long-time transportation become serious problems in the use process of the mortar.
The retarder is doped into the mortar to prolong the hydration hardening time of cement, so that the new mortar can keep plasticity for a long time, thereby adjusting the setting time of the new mortar and avoiding the hardening of cement in the long-distance transportation process. However, most of the mortar retarders currently on the market have a mortar strength of M30 (cement usage of 460-530kg/M 3 ) In the case of the above, the 28d strength is slightly lower than 30MPa, the time for the consistency to drop by 10mm is shorter, and the time is about 24-26 hours, so that the use requirement cannot be met.
In summary, the conventional retarder for mortar is not ideal in retarding effect, and it is required to provide a retarder for mortar which is high in strength and slow in consistency decrease.
Disclosure of Invention
Aiming at the problems in the prior art, the retarder for the mortar is provided, and the retarder is added into the mortar, so that the compressive strength of the mortar is high, the consistency is slowly reduced, the coagulation of the mortar can be effectively slowed down, and the mortar is convenient for long-distance transportation. The invention also provides a preparation method, a use method and an application of the retarder for mortar.
The invention provides a retarder for mortar, which comprises the following raw materials in parts by weight: 100-150 parts of sugar substances, 100-150 parts of citric acid, 400-500 parts of borax, 5-10 parts of hydroxypropyl methyl cellulose, 30-50 parts of anhydrous sodium sulfate and 600-800 parts of water;
according to some embodiments of the invention, the composition comprises the following raw materials in parts by weight: 130-150 parts of sugar substances, 120-140 parts of citric acid, 450-500 parts of borax, 8-10 parts of hydroxypropyl methyl cellulose, 40-50 parts of anhydrous sodium sulfate and 600-800 parts of water.
According to some embodiments of the invention, the hydroxypropyl methylcellulose has a number average molecular weight of 8000-12000.
According to some embodiments of the invention, the hydroxypropyl methylcellulose has a number average molecular weight of 10000.
According to some embodiments of the invention, the carbohydrate is white sugar, brown sugar or sucrose.
According to some embodiments of the invention, the carbohydrate is white sugar.
According to some embodiments of the invention, the sodium sulfate is anhydrous sodium sulfate with a purity of 99% or more.
In a second aspect, the invention provides a method for preparing the retarder according to the first aspect, comprising mixing a saccharide, citric acid, borax, hydroxypropyl methylcellulose, sodium sulfate and water.
The third aspect of the invention provides the retarder of the first aspect or the retarder prepared by the method of the third aspect, and the application of the retarder in the mortar field.
In a fourth aspect, the invention provides a method of using the retarder of the first aspect, wherein the retarder is incorporated in an amount of 0.2-0.3% by weight of the cement.
According to some embodiments of the invention, the retarder is incorporated in an amount of 0.2% by weight of the cement.
Compared with the prior art, the invention has the following beneficial effects:
(1) The retarder for mortar provided by the invention can inhibit cement hydration and crystallization, has a retarding effect, and supports long-distance transportation of mortar.
(2) According to the retarder for the mortar, the molecular surfaces of the white sugar and the citric acid compound have strong polarities, the synergistic effect of the white sugar and the citric acid can be better adsorbed on the surfaces of cement particles, and the formed calcium carbonate crystal nucleus is destroyed, so that the hydration process of cement is hindered, the mutual contact of crystals is shielded, and the structure forming process is changed. In addition, hydroxycarboxylic acids and their salts can be used in combination with Ca in cement 2+ Forming unstable complex, controlling Ca in liquid phase at initial stage of hydration 2+ Is effective in retarding.
(3) The borax can inhibit calcium hydroxide crystallization, and form an amorphous isolation layer on the surface of cement particles by using a complex, so that hydration of cement and crystallization precipitation are delayed.
(4) The hydroxypropyl methylcellulose of the invention can prevent water loss, and can absorb a large amount of water until the concentration difference disappears by utilizing osmotic pressure generated by the concentration difference between the ions and groups in the cellulose and the related components of the aqueous solution and the affinity of the polyelectrolyte and water, thus reducing the water loss.
(5) In the invention, sodium sulfate is dissolved in water to react with calcium hydroxide generated by cement hydration to generate calcium oxide and calcium sulfate. The newly formed calcium sulfate has very fine particles and much higher activity than calcium sulfate, and thus is compatible with C 3 The reaction of A generates hydrated calcium sulfoaluminate at a much faster rate, which can increase C 3 The solubility of A and gypsum accelerates the amount of calcium sulfoaluminate in the cement, resulting in setting hardening of the cement and an increase in early strength.
Detailed Description
In order that the invention may be more readily understood, the invention will be described in detail below with reference to the following examples, which are given by way of illustration only and are not limiting of the scope of application of the invention.
The testing method and the materials used in the testing are as follows:
(1) The consistency of the mortar is tested by adopting a 4.0.2 mortar consistency meter in JGJ/T70-2009 building mortar basic performance test method Standard;
(2) The compressive strength adopts a 9.0.1 test instrument and a method in JGJ/T70-2009 building mortar basic performance test method standard;
(3) The mortar consistency is 80-90 mm according to the initial consistency specified in GB/T25181-2019;
(4) The mixing ratio of the mortar adopts the strength grade M30 (cement 460-530 kg/M) specified in GB/T25181-2019 3 270-330 kg/m of water 3 )；
(5) The sand in the mortar is within 4.75mm specified by GB/T25181-2019; the cement adopts golden corner cement P.O42.5;
(6) The water reducer adopts 503A of Shanxi Jia Weixin materials, inc., the mixing amount of the water reducer is 0.4% of the cement dosage, namely the weight proportion of mortar is cement to sand to water=500 g to 1450g to 290g;
in the examples and comparative examples of the present invention, white sugar was technical grade white sugar of the new energy science co.ltd of petri new energy in su zhou;
the citric acid is 99% citric acid of Zibo plus biological technology Co., ltd;
borax is industrial grade borax produced by Ziborixi energy Limited company;
hydroxypropyl methylcellulose is available from atanan, chemical industry limited, with a number average molecular weight of 10000;
the anhydrous sodium sulfate is industrial grade 99% anhydrous sodium sulfate produced by commercial limited company of the ancient cooking vessel of the god of longevity.
Example 1
A retarder for mortar is prepared from the following raw materials: 150g of white sugar, 140g of citric acid, 500g of borax, 8g of hydroxypropyl methyl cellulose, 45g of anhydrous sodium sulfate and 800g of water.
And fully mixing and dissolving the preparation raw materials to obtain the retarder for the mortar.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. The cement mortar added with retarder is subjected to performance detection, the detection result is that the compressive strength of 28d is 38MPa, the initial consistency is 88mm, the time when the consistency is reduced to 78mm is 36h, and the use requirement of the cement mortar is far better than the use requirement of the cement mortar which is required to be used for not less than 24h when the M30 strength is not less than 30MPa and the consistency is reduced by 10mm and specified by GB/T25181-2019.
Example 2
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, the mixing amount is 0.3% of the cement dosage, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.3% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the compressive strength of the cement mortar added with the retarder is 27.6Mpa when the detection result is 28d, the initial consistency is 88mm, the time when the consistency is reduced to 78mm is 39h, and the compressive strength of 28d cannot meet the use requirement specified in GB/T25181-2019. (initial consistency decreases more slowly when retarder is excessively incorporated, resulting in lower compressive strength at the early stage)
Example 3
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, the mixing amount is 0.1% of the cement dosage, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.1% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the compressive strength of the cement mortar is 26Mpa when the detection result is 28d, the initial consistency is 87mm, the time for reducing the consistency to 77mm is 27h, and the use requirement specified by GB/T25181-2019 cannot be met.
Example 4
The retarder for mortar is prepared by the same raw material formulation and preparation method as in example 1, except that the citric acid in the raw material components is 120g, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the detection result is that the compressive strength of 28d is 32Mpa, the initial consistency is 88mm, the time for reducing the consistency to 78mm is 28h, and the use requirement specified by GB/T25181-2019 is met.
Example 5
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, except that the weight of the other components is unchanged, and the white sugar in the raw material components is 130 g.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the compressive strength of the cement mortar is 31.7Mpa after 28d, the initial consistency is 87mm, the time for reducing the consistency to 77mm is 27h, and the use requirement specified in GB/T25181-2019 is met.
Example 6
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, except that the borax in the raw material components is 450g and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the detection result is that the compressive strength of 28d is 29.8Mpa, the initial consistency is 88mm, the time for reducing the consistency to 78mm is 23h, and the detection result is slightly lower than the use requirement specified in GB/T25181-2019.
Example 7
The retarder for mortar is prepared by the same raw material formulation and preparation method as in example 1, except that the hydroxypropyl methylcellulose in the raw material components is 10g, and the weight of the other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the detection result is that the compressive strength of 28d is 34Mpa, the initial consistency is 86mm, the time for reducing the consistency to 76mm is 39h, and the use requirement specified in GB/T25181-2019 is met. (an increase in the amount of hydroxypropyl methylcellulose added, a slower evaporation of water, a longer decrease in consistency, and an inability to ensure early strength, resulting in a lower 28d strength, should be properly reduced in view of cost)
Example 8
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, except that the anhydrous sodium sulfate in the raw material components is 40g, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the compressive strength of the cement mortar is 29.5Mpa after 28d, the initial consistency is 88mm, the time for reducing the consistency to 78mm is 36.5h, and the compressive strength of the cement mortar is lower than the use requirement specified in GB/T25181-2019.
Example 9
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, except that the anhydrous sodium sulfate in the raw material components is 30g, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the compressive strength of the cement mortar is 22Mpa when the detection result is 28d, the initial consistency is 86mm, the time for the consistency to drop to 76mm is 27h, and the compressive strength of the detection result is lower than the use requirement specified in GB/T25181-2019.
Comparative example 1
The preparation raw material formula and the preparation method of the retarder for mortar are the same as those of the example 1, except that white sugar is not added into the raw material components, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. The cement mortar added with retarder is subjected to performance detection, the detection result is that the compressive strength of 28d is 26Mpa, the initial consistency is 85mm, and the time for the consistency to drop to 75mm is 22h.
Comparative example 2
The retarder for mortar is prepared by the same raw material formulation and preparation method as in example 1, except that citric acid is not added into the raw material components, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. The cement mortar added with retarder is subjected to performance detection, the detection result is that the compressive strength of 28d is 24.7Mpa, the initial consistency is 85mm, and the time for the consistency to drop to 75mm is 22.8h.
Comparative example 3
The preparation raw material formula and the preparation method of the retarder for mortar are the same as those of the example 1, except that borax is not added into the raw material components, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. The cement mortar added with retarder is subjected to performance detection, the detection result is that the compressive strength of 28d is 19.5Mpa, the initial consistency is 78mm, and the time for the consistency to drop to 68mm is 15h.
Comparative example 4
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, except that the hydroxypropyl methylcellulose in the raw material components is 5g, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the detection result is that the compressive strength of 28d is 28Mpa, the initial consistency is 81mm, the time for reducing the consistency to 71mm is 20h, and the detection result is lower than the use requirement specified in GB/T25181-2019.
Comparative example 5
The retarder for mortar is prepared by the same raw material formula and preparation method as in example 1, except that anhydrous sodium sulfate is not added into the raw material components, and the weight of other components is unchanged.
The retarder prepared is mixed into cement mortar, and the mixing amount is 0.2% of the cement dosage. And (3) performing performance detection on the cement mortar added with the retarder, wherein the detection result is that the compressive strength of 28d is 14Mpa, the initial consistency is 80mm, and the time for the consistency to drop to 70mm is 22h.
In conclusion, the retarder for the mortar can effectively slow down the hydration hardening speed of cement mortar, so that the new mortar can keep plasticity for a long time, and the early hardness of cement is improved.
What has been described above is merely a preferred example of the present invention. It should be noted that other equivalent modifications and improvements will occur to those skilled in the art, and are intended to be within the scope of the present invention, as a matter of common general knowledge in the art, in light of the technical teaching provided by the present invention.
Claims (5)
1. The using method of the retarder for the M30 mortar is characterized in that the retarder for the mortar comprises the following raw materials in parts by weight: 130-150 parts of sugar substances, 120-140 parts of citric acid, 500 parts of borax, 8 parts of hydroxypropyl methyl cellulose, 45 parts of sodium sulfate and 800 parts of water;
the mixing amount of the retarder is 0.2 weight percent of the cement;
the sugar substance is white sugar;
the mortar consists of a water reducer, cement, sand and water, wherein the mixing amount of the water reducer is 0.4% of the dosage of the cement, and the weight mixing ratio of the cement, the sand and the water is 500:1450:290.
2. the method of use according to claim 1, wherein the hydroxypropyl methylcellulose has a number average molecular weight of 8000-12000.
3. The method of use according to claim 2, wherein the hydroxypropyl methylcellulose has a number average molecular weight of 10000.
4. A method of use according to any one of claims 1 to 3, wherein the sodium sulphate is anhydrous sodium sulphate with a purity of 99% or more.
5. Use of a retarder as used in the method of any of claims 1-4 in the mortar field.
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