阅读说明：本技术 一种砂浆外加剂及其制备方法以及砂浆外加剂的使用方法 (Mortar admixture, preparation method thereof and use method of mortar admixture ) 是由 咸立军 吕昌永 董帅华 滕树雷 于 2021-08-18 设计创作，主要内容包括：本发明涉及一种砂浆外加剂及其制备方法以及砂浆外加剂的使用方法,一种砂浆外加剂,包括以下重量份的原料：葡萄糖酸钠40～60份、白糖30～45份、引气剂7～12份、纤维素醚1～3份、保水剂1～3份、聚羧酸减水剂110～140份和炭屏蔽剂4～6份,所述炭屏蔽剂为十二烷基苯磺酸钠。炭屏蔽剂的加入使得炭屏蔽剂优先被粉煤灰中的炭孔隙吸附,从而使得炭孔隙不易继续吸收引气剂,从而实现提高砂浆抗冻性能的目的；本申请的方法具有进一步提高砂浆抗冻性能的优点；本申请砂浆外加剂的的使用方法具有操作简单,且砂浆与砂浆外加剂混合均匀性较好的优点。(The invention relates to a mortar admixture, a preparation method thereof and a use method of the mortar admixture, wherein the mortar admixture comprises the following raw materials in parts by weight: 40-60 parts of sodium gluconate, 30-45 parts of white sugar, 7-12 parts of an air entraining agent, 1-3 parts of cellulose ether, 1-3 parts of a water retaining agent, 110-140 parts of a polycarboxylic acid water reducing agent and 4-6 parts of a carbon shielding agent, wherein the carbon shielding agent is sodium dodecyl benzene sulfonate. The carbon shielding agent is added, so that the carbon shielding agent is preferentially adsorbed by carbon pores in the fly ash, the carbon pores are difficult to continuously absorb the air entraining agent, and the aim of improving the frost resistance of the mortar is fulfilled; the method has the advantage of further improving the frost resistance of the mortar; the application method of the mortar admixture has the advantages of simple operation and good mixing uniformity of the mortar and the mortar admixture.)

1. A mortar admixture is characterized in that: the feed comprises the following raw materials in parts by weight: 40-60 parts of sodium gluconate, 30-45 parts of white sugar, 7-12 parts of an air entraining agent, 1-3 parts of cellulose ether, 1-3 parts of a water retaining agent, 110-140 parts of a polycarboxylic acid water reducing agent and 4-6 parts of a carbon shielding agent, wherein the carbon shielding agent is sodium dodecyl benzene sulfonate.

2. The mortar admixture according to claim 1, wherein: the mortar admixture comprises the following raw materials in parts by weight: 50 parts of sodium gluconate, 40 parts of white sugar, 10 parts of sodium dodecyl sulfate, 2 parts of cellulose ether, 2 parts of a water-retaining agent, 120 parts of a polycarboxylic acid water reducing agent and 5 parts of a carbon shielding agent.

3. The mortar admixture according to claim 2, wherein: the air entraining agent is sodium dodecyl sulfate.

4. The mortar admixture according to claim 2, wherein: the mortar admixture also comprises 7-10 parts by weight of lignin fiber.

5. The method for producing a mortar admixture according to any one of claims 1 to 4, wherein: the method comprises the following steps: s1, adding sodium gluconate, white sugar, an air entraining agent, cellulose ether, a water retaining agent and a polycarboxylic acid water reducing agent into water, uniformly mixing to obtain a first mixture, and adding a carbon shielding agent into the water to obtain a second mixture;

s2, drying the first mixture to obtain a prefabricated object;

s3, spraying the second mixture onto the surface of the prefabricated object to obtain the mortar admixture, wherein the mass concentration of the carbon shielding agent in the second mixture is 10%.

6. The method for preparing a mortar admixture according to claim 5, wherein: and S2, specifically, the first mixture is subpackaged into a plurality of moulds and dried to obtain granular prefabricated objects.

7. According toThe method for preparing a mortar admixture according to claim 6, wherein: the volume of the preform particles was 0.8cm³～1.5cm³。

8. The method for preparing a mortar admixture according to claim 6, wherein: 7-10 parts of lignin fiber is added in the S3, and S3 is specifically that after the lignin fiber is adhered to the surface of the prefabricated object particles, the second mixture is sprayed on the surface of the prefabricated object particles.

9. The use method of the mortar admixture is characterized by comprising the following steps: the method comprises the following steps: a1, mixing the mortar with water to obtain a primary mixture; a2, introducing air into the primary mixture prepared in the A1; a3, the mortar admixture as described in any one of claims 1 to 4 or the mortar admixture obtained by the method as described in any one of claims 5 to 8 is added to the preliminary mixture after the treatment of A2 and mixed to obtain the product.

Technical Field

The invention relates to the technical field of mortar admixtures, in particular to a mortar admixture and a preparation method thereof as well as a use method of the mortar admixture.

Background

Mortar is a bonding substance used for building bricks on buildings, and is formed by adding water into sand and cementing materials according to a certain proportion, and is also called mortar or mortar. The mortar additive comprises components such as an air entraining agent, a water reducing agent and the like, and is an additive which is added into mortar and used for improving the performance of the mortar.

The inventor thinks that: as the mortar contains part of the fly ash and the carbon in the fly ash is easy to adsorb the air entraining agent in the mortar admixture, the air content of the mortar is reduced, and the frost resistance of the mortar is reduced.

Disclosure of Invention

The invention provides a mortar admixture, a preparation method thereof and a use method of the mortar admixture, so that carbon in fly ash is not easy to adsorb an air entraining agent, and the aim of improving the frost resistance of mortar is fulfilled.

In a first aspect, the present application provides a mortar admixture, which adopts the following technical scheme:

a mortar admixture comprises the following raw materials in parts by weight: 40-60 parts of sodium gluconate, 30-45 parts of white sugar, 7-12 parts of an air entraining agent, 1-3 parts of cellulose ether, 1-3 parts of a water retaining agent, 110-140 parts of a polycarboxylic acid water reducing agent and 4-6 parts of a carbon shielding agent, wherein the carbon shielding agent is sodium dodecyl benzene sulfonate.

By adopting the technical scheme, the carbon shielding agent is preferentially adsorbed by carbon pores in the fly ash due to the addition of the carbon shielding agent, so that the carbon pores are not easy to continuously absorb the air entraining agent, and the aim of improving the frost resistance of the mortar is fulfilled.

Optionally: the mortar admixture comprises the following raw materials in parts by weight: 50 parts of sodium gluconate, 40 parts of white sugar, 10 parts of sodium dodecyl sulfate, 2 parts of cellulose ether, 2 parts of a water-retaining agent, 120 parts of a polycarboxylic acid water reducing agent and 5 parts of a carbon shielding agent.

Optionally: the air entraining agent is sodium dodecyl sulfate.

By adopting the technical scheme, stable microbubbles are introduced into the mortar by adding the sodium dodecyl sulfate, so that the density of the wet mortar is reduced, and the constructability is better.

Optionally: the mortar admixture also comprises 7-10 parts by weight of lignin fiber.

By adopting the technical scheme, the addition of the lignin fiber improves the construction property of the mortar.

In a second aspect, the present application provides a method for preparing a mortar admixture, which adopts the following technical scheme:

a preparation method of a mortar admixture comprises the following steps: s1, adding sodium gluconate, white sugar, an air entraining agent, cellulose ether, a water retaining agent and a polycarboxylic acid water reducing agent into water, uniformly mixing to obtain a first mixture, and adding a carbon shielding agent into the water to obtain a second mixture;

s2, drying the first mixture to obtain a prefabricated object;

s3, spraying the second mixture onto the surface of the prefabricated object to obtain the mortar admixture, wherein the mass concentration of the carbon shielding agent in the second mixture is 10%.

Through adopting above-mentioned technical scheme, after the first mixture is dry, thereby the white sugar caking makes the prefabricate demonstrate the condition including the cladding of the rest components of white sugar with the mortar admixture, with the second mixture spraying to the prefabricate outside, thereby make the carbon shielding agent adhere to the white sugar outside, thereby make the staff put into the aquatic with the mortar admixture after, the carbon shielding agent preferentially gets into in the mortar, and contact with the charcoal in the fly ash, in order to shield the hole on carbon surface, and after the white sugar melts gradually, the rest components of mortar admixture are released, so that the rest components of mortar admixture get into in the mortar, thereby realize making the air entraining agent difficult by the carbon adsorption, with the purpose that improves mortar freezing resistance.

Optionally: and S2, specifically, the first mixture is subpackaged into a plurality of moulds and dried to obtain granular prefabricated objects.

By adopting the technical scheme, the granular prefabricated objects realize the purpose of uniformly mixing the mortar admixture and the mortar.

Optionally: the volume of the preform particles was 0.8cm³～1.5cm³。

By adopting the technical scheme, the volume of the prefabricated object is 0.8cm³～1.5cm³The white sugar has slow release effect on other components of the mortar admixture, and the mixing uniformity of the mortar admixture and the mortar is not easy to influence and is selectable: 7-10 parts of lignin fiber is added in the S3, and S3 is specifically that after the lignin fiber is adhered to the surface of the prefabricated object particles, the second mixture is sprayed on the surface of the prefabricated object particles.

By adopting the technical scheme, the lignin fibers are adhered to the surfaces of the prefabricated particles, so that after the mortar admixture is packaged by workers, the lignin fibers are coated on the outer sides of the mortar admixture particles, and the mortar admixture particles are not easily adhered together; on the other hand, the lignin fiber has better water absorption, so that the white sugar is not easy to absorb water and become sticky, and further the mortar admixture is not easy to stick together.

In a third aspect, the application provides a method for using a mortar admixture, which adopts the following technical scheme:

the use method of the mortar admixture comprises the following steps: a1, mixing the mortar with water to obtain a primary mixture; a2, introducing air into the primary mixture prepared in the A1; and A3, adding the mortar admixture into the preliminary mixture after the A2 treatment, and mixing to obtain the product.

By adopting the technical scheme, when the mortar admixture is used, the air is introduced into each material of the mortar mixed with water in advance by a worker, so that the mixing uniformity of each material of the mortar is improved, and the air introduced in advance increases the air quantity contacted with carbon particles in the fly ash, so that the air forms tiny bubbles on the surfaces of the carbon particles to prevent the air-entraining agent from entering pores of the carbon particles.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the carbon shielding agent is added, so that the carbon shielding agent is preferentially adsorbed by carbon pores in the fly ash, the carbon pores are difficult to continuously absorb the air entraining agent, and the aim of improving the frost resistance of the mortar is fulfilled;

2. according to the preparation method, the white sugar is coated on the outer sides of the air entraining agent and other raw materials, so that the slow release effect on the air entraining agent is achieved, the carbon shielding agent is combined with the carbon conveniently, and the purposes that the air entraining agent is not easily absorbed by carbon pores continuously and the frost resistance of the mortar is improved are further achieved;

3. the application method has the advantages of simple operation and good mixing uniformity of the mortar and the mortar admixture.

Detailed Description

The present invention will be described in further detail with reference to examples. The materials adopted in the embodiment of the application are all sold in the market, wherein the white sugar is industrial white sugar, the lauryl sodium sulfate is purchased from Henan Huashuo chemical products, Inc., the water-retaining agent is polyacrylamide, the molecular weight is 800-1200 ten thousand, and the water-retaining agent is purchased from North China Biotechnology, Inc. of Dongying; the polycarboxylate superplasticizer is purchased from Jinan Kangyue chemical technology Co., Ltd; the cellulose ether is purchased from Jining Sanshi Biotech limited, and is PHMC; lignin fiber was purchased from Gallery stroke-equalizing energy-saving technology, Inc.

Examples

Example 1

A preparation method of a mortar admixture comprises the following steps: s1, adding 40kg of sodium gluconate, 30kg of white sugar, 7kg of sodium dodecyl sulfate, 1kg of cellulose ether, 1kg of polyacrylamide and 110kg of polycarboxylic acid water reducer into water, uniformly mixing to obtain a first mixture, adding 4kg of sodium dodecyl benzene sulfonate into the water to obtain a second mixture, wherein the mass concentration of the sodium dodecyl benzene sulfonate in the second mixture is 10%;

s2, subpackaging the first mixture into a plurality of moulds, and drying to obtain granular prefabricated objects, wherein the volume of each prefabricated object is 1cm³(ii) a And S3, uniformly spraying the second mixture on the surfaces of the prefabricated particles to obtain the mortar admixture.

The use method of the mortar admixture comprises the following steps: a1, mixing the mortar with water to obtain a primary mixture; a2, introducing air into the primary mixture prepared by the A1, wherein the addition amount of the air is 0.5L/min; a3, adding the mortar admixture prepared in the embodiment into the primary mixture after the A2 treatment, and mixing to obtain the product.

In the embodiment, the mixing proportion of the mortar is designed according to the strength grade of M10: wherein the cement mixing amount is 224kg/m³The mixing amount of the fly ash is 56kg/m³The sand mixing amount is 1000kg/m³The water mixing amount is 200kg/m³The mixing amount of the air entraining agent in the mortar admixture is 0.1kg/m³Added to the preliminary mixture.

Examples 2 to 9

Examples 2-9 differ from example 1 in that: the material dosage and the prefabricated object volume are different, and the specific data are shown in the table 1.

Example 10

A preparation method of a mortar admixture comprises the following steps: s1, adding 50kg of sodium gluconate, 40kg of white sugar, 10kg of sodium dodecyl sulfate, 2kg of cellulose ether, 2kg of polyacrylamide and 120kg of polycarboxylic acid water reducer into water, uniformly mixing to obtain a first mixture, and adding 5kg of sodium dodecyl benzene sulfonate into the water to obtain a second mixture, wherein the mass concentration of the sodium dodecyl benzene sulfonate in the second mixture is 10%;

s2, subpackaging the first mixture into a plurality of moulds, and drying to obtain granular prefabricated objects, wherein the volume of each prefabricated object is 1cm³；

And S3, uniformly adhering 7kg of lignin fibers to the surfaces of the prefabricated particles, and uniformly spraying the second mixture to the surfaces of the prefabricated particles to obtain the mortar admixture.

The use method of the mortar admixture comprises the following steps: a1, mixing the mortar with water to obtain a primary mixture; a2, introducing air into the primary mixture prepared by the A1, wherein the addition amount of the air is 0.5L/min; a3, adding the mortar admixture prepared in the embodiment into the primary mixture after the A2 treatment, and mixing to obtain the product.

In the embodiment, the mixing proportion of the mortar is designed according to the strength grade of M10: wherein the cement mixing amount is 224kg/m³The mixing amount of the fly ash is 56kg/m³The sand mixing amount is 1000kg/m³The water mixing amount is 200kg/m³The mixing amount of the air entraining agent in the mortar admixture is 0.1kg/m³Added to the preliminary mixture.

Example 11

The present embodiment differs from embodiment 10 in that: the amount of lignin fibers was 9 kg.

Example 12

The present embodiment differs from embodiment 10 in that: the amount of lignin fibers was 10 kg.

Example 13

This example differs from example 1 in that: a preparation method of a mortar admixture comprises the following steps: s1, uniformly mixing 40kg of sodium gluconate, 30kg of white sugar, 7kg of sodium dodecyl sulfate, 1kg of cellulose ether, 1kg of polyacrylamide, 110kg of polycarboxylic acid water reducing agent and 4kg of dodecylbenzene sulfonic acid to obtain the mortar admixture.

Comparative example

Comparative example 1

A preparation method of a mortar admixture comprises the following steps: s1, adding 40kg of sodium gluconate, 30kg of white sugar, 7kg of sodium dodecyl sulfate, 1kg of cellulose ether, 1kg of polyacrylamide and 110kg of polycarboxylic acid water reducing agent into water, and uniformly mixing to obtain a first mixture;

s2, subpackaging the first mixture into a plurality of moulds, and drying to obtain a prefabricated object, wherein the volume of the prefabricated object is 1cm³And obtaining the mortar admixture.

The use method of the mortar admixture comprises the following steps: a1, mixing the mortar with water to obtain a primary mixture; a2, introducing air into the primary mixture prepared by the A1, wherein the addition amount of the air is 0.5L/min; a3, adding the mortar admixture prepared in the embodiment into the primary mixture after the A2 treatment, and mixing to obtain the product.

In the embodiment, the mixing proportion of the mortar is designed according to the strength grade of M10: wherein the cement mixing amount is 224kg/m³The mixing amount of the fly ash is 56kg/m³The sand mixing amount is 1000kg/m³The water mixing amount is 200kg/m³The mixing amount of the air entraining agent is 0.1kg/m³。

Performance test

Detection method

Examples 1-13 and comparative example 1 were tested for cubic compressive strength and freeze resistance after 15 cycles of freeze-thaw according to JGJ/70-2009, with the specific test results shown in Table 2.

Combining example 1 and comparative example 1 with table 2, it can be seen that the addition of sodium dodecylbenzenesulfonate, i.e., a carbon shielding agent, in example 1 effectively reduces the strength loss of the mortar test piece after freezing, as compared to comparative example 1, which may be due to: after being added, the sodium dodecyl benzene sulfonate is preferentially combined with pores of carbon in the fly ash, so that the carbon is not easy to adsorb an air entraining agent, and the aim of improving the frost resistance of a mortar test piece is fulfilled;

as can be seen by combining examples 5 to 9 with Table 2, when the volume of the preform is too large or too small, the mortar specimens each have a strength loss after freezing of 0.8 to 1.5cm as compared with the volume of the preform³The range is large.

By combining example 4 and example 10 and table 2, it can be seen that, compared with example 4, the addition of the lignin fiber in example 10 improves the cubic compressive strength of the mortar test piece, and effectively reduces the strength loss of the mortar test piece after freezing.

Combining example 1 with example 13 and table 2, it can be seen that, compared to the direct mixing of the mortar admixture in example 13, the method of the present application in example 1 results in an effective loss of the post-freezing strength of the mortar test pieces, which may be caused by: according to the method, the white sugar is coated on the outer sides of other raw materials, so that the release of the air entraining agent is delayed, and the carbon shielding agent can be further combined with more carbon pores in the fly ash, so that the aim of improving the frost resistance of the test piece is further fulfilled.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.