Preparation method and application of novel mortar admixture

Abstract

The invention discloses a preparation method and application of a novel mortar admixture, and relates to the technical field of mortar admixtures, and the preparation method comprises the following steps: preparing recycled aggregate for pretreatment, preparing a component A from the recycled aggregate, a defoaming agent, a liquid viscosity modifier and a surfactant, preparing a component B from a water reducing agent, a water retaining agent and the balance of water, and mixing the component B and the recycled aggregate to obtain the novel mortar admixture. Adding 30% of the component B into the component A, stirring while heating to 45-65 DEG C, continuously and slowly adding the residual solution of the component B, and then continuously stirring for 65-85 minutes to obtain the mortar admixture. Compared with the prior art, the invention has the advantage of providing the preparation method and application of the novel mortar admixture which can be used by using waste buildings and has multiple composite functions.

Description

Technical Field

[0001] The present invention relates to the technical field of mortar admixtures, and in particular to a preparation method and application of a novel mortar admixture. Background Art

[0002] Ordinary cement mortar is generally formed by mixing cement, fine aggregate and water. In construction projects, it is mostly used for foundation and wall masonry, indoor and outdoor plastering, etc. With the rapid development of the construction industry, the public has higher and higher requirements for the performance of cement mortar. In order to make up for the shortcomings of ordinary cement mortar and give full play to the advantages of cement mortar, various admixtures or additives are usually added to cement mortar to optimize the performance, improve the workability, mechanical properties and durability of cement mortar, etc.

[0003] Among them, mortar admixtures are substances added during the mixing process of building mortar to improve the performance of building mortar. Mortar admixtures can effectively improve the performance of building mortar. Mortar admixtures determine the workable time and setting time of mortar, and have an important influence on the workability, construction performance, strength and hollowing and cracking of mortar.

[0004] The mortar admixtures in the prior art have poor performance, and are mostly used as water retaining agents or plasticizers, with relatively simple performance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a preparation method and application of a new type of composite multifunctional mortar admixture that can be used in abandoned buildings.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a preparation method of a novel mortar admixture, comprising the following steps: preparing recycled aggregate for pretreatment, adding the treated recycled aggregate into a modifier for soaking, drying for standby use, and crushing and screening the dried recycled aggregate; using the recycled aggregate and a defoamer, a liquid viscosity modifier and a surfactant to prepare component A, and using a water reducer, a water retaining agent and the remainder of water to prepare component B,

[0007] Add 30% of component B into component A, stir and raise the temperature to 45-65° C., continue to slowly add the remaining component B solution, and continue stirring for 65-85 minutes after adding to obtain a mortar admixture.

[0008] Preferably, the component A comprises adding recycled aggregate into a material barrel, sequentially adding clean water, a defoamer, and a liquid viscosity modifier, stirring to uniformly mix the materials, slowly adding a surfactant, and continuing stirring to obtain component A.

[0009] Preferably, the ratio of each component in the component A is 35-55% of recycled aggregate, 0.01-0.1% of defoamer, 10-15% of liquid viscosity modifier, 15-25% of surfactant and the balance of water.

[0010] Preferably, the modifier includes at least one of polyether polyol, sodium silicate and sodium hypophosphite, the recycled aggregate is soaked in the modifier and then dried for 7 to 10 hours, and the recycled aggregate in component A has a crushing particle size of 1 to 5 mm.

[0011] Preferably, the component B comprises 25-45% of water reducing agent, 5-15% of water retaining agent and the balance of water.

[0012] Preferably, the recycled aggregate includes at least one of waste concrete, bricks, and fly ash, the defoamer is a polyether defoamer, the liquid viscosity modifier is any one of polyvinyl alcohol and polyacrylamide, the surfactant is used as an air entraining agent, the water reducer is a polycarboxylic acid water reducer, and the water retaining agent is a cellulose ether composition.

[0013] Another aspect of the invention discloses application of a mortar admixture in wet-mixed mortar.

[0014] The advantages of the present invention compared with the prior art are: in the present invention, recycled aggregate is selected as the base material, and the performance of the aggregate is effectively improved through pretreatment, soaking modification, drying and crushing processes. At the same time, preparations such as composite defoamers, liquid viscosity modifiers and surfactants are prepared as admixtures that can significantly improve the compressive strength and bonding strength of the mortar, enhance the durability and service life of the mortar, and the reuse of recycled aggregate increases environmental protection and is easy to promote and use. DETAILED DESCRIPTION

[0015] References to embodiments of the present invention will now be provided in detail, one or more examples of which are described below. Each example is provided as an explanation rather than a limitation of the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit of the present invention. For example, a feature illustrated or described as part of one embodiment may be used in another embodiment to produce a further embodiment.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0017] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0018] Except as indicated in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients, physicochemical properties, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about".

[0019] For example, therefore, unless otherwise indicated, the numerical parameters listed in the above description and the attached claims are approximate values, and those skilled in the art can appropriately change these approximate values ​​by utilizing the teachings disclosed herein to seek to obtain the desired properties. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0020] As shown in the figure, a preparation method of a novel mortar admixture comprises the following steps: preparing recycled aggregate for pretreatment, adding the treated recycled aggregate into a modifier for soaking, drying for standby use, and crushing and screening the dried recycled aggregate; using the recycled aggregate and a defoamer, a liquid viscosity modifier and a surfactant to prepare component A, and preparing component B with a water reducer, a water retaining agent and the remainder of water, adding 30% of component B into component A, stirring and heating to 45-65°C, and continuing to slowly add the remaining component B solution, and continuing to stir for 65-85 minutes after adding to obtain a mortar admixture.

[0021] The recycled aggregate includes at least one of waste concrete, bricks and fly ash, the defoamer is a polyether defoamer, the liquid viscosity modifier is any one of polyvinyl alcohol and polyacrylamide, the surfactant is an air entraining agent, the water reducer is a polycarboxylic acid water reducer, and the water retaining agent is a cellulose ether composition.

[0022] When used specifically:

[0023] Component A includes adding recycled aggregate into a barrel, adding clean water, a defoamer, and a liquid viscosity modifier in sequence, stirring the materials to make them evenly mixed, slowly adding a surfactant, and continuing to stir to obtain component A. At the same time, the ratio of each component in component A is 35-55% of recycled aggregate, 0.01-0.1% of defoamer, 10-15% of liquid viscosity modifier, 15-25% of surfactant and the balance of water.

[0024] The modifier includes at least one of polyether polyol, sodium silicate and sodium hypophosphite. The recycled aggregate is soaked in the modifier and then dried for 7 to 10 hours. The recycled aggregate in component A has a crushing particle size of 1 to 5 mm, so as to repair the recycled aggregate, improve and restore its performance.

[0025] When used specifically, component B contains 25-45% water reducing agent, 5-15% water retaining agent and the balance is water.

[0026] The present invention is specifically implemented:

[0027] Prepare at least one of waste concrete, bricks, fly ash, etc. as recycled aggregate, ensure that the aggregate is clean and free of large impurities, select at least one of polyether polyol, sodium silicate, and sodium hypophosphite as a modifier, perform preliminary cleaning on the recycled aggregate, remove surface dust and impurities, add the treated recycled aggregate to the modifier, ensure that the aggregate is completely immersed in the modifier, and allow the modifier to fully penetrate into the interior of the aggregate, take out the soaked recycled aggregate, dry it for 7 to 10 hours, until there is no obvious moisture on the surface, and then crush and sieve it to a particle size of 1 to 5 mm.

[0028] The crushed and sieved recycled aggregate, polyether defoamer, liquid viscosity modifier (polyvinyl alcohol or polyacrylamide) and air entraining agent are mixed evenly to obtain component A, the polycarboxylate water reducer, cellulose ether composition and the remaining water are mixed evenly to obtain component B, and component A and component B are fully mixed and reacted until they are uniform and have no obvious particles to obtain an admixture, and the obtained admixture can be added to cement mortar for use in improving mortar performance.

[0029] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0030] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection claimed in the present invention is defined by the attached claims and their equivalents. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The present invention and its implementation methods are described above, and such description is not restrictive. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design structures and embodiments similar to the technical solution without creativity, which should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a novel mortar admixture, characterized in that: The method comprises the following steps: preparing recycled aggregate for pretreatment, adding the treated recycled aggregate into a modifier for soaking, drying and setting aside, and crushing and screening the dried recycled aggregate; using the recycled aggregate, a defoamer, a liquid viscosity modifier and a surfactant to prepare component A, and using a water reducing agent, a water retaining agent and the remaining water to prepare component B, Add 30% of component B into component A, stir and raise the temperature to 45-65° C., continue to slowly add the remaining component B solution, and continue stirring for 65-85 minutes after adding to obtain a mortar admixture.

2. The method for preparing a novel mortar admixture according to claim 1, characterized in that: The component A comprises adding recycled aggregate into a material barrel, sequentially adding clean water, a defoamer, and a liquid viscosity modifier, stirring to make the materials uniformly mixed, slowly adding a surfactant, and continuing stirring to obtain component A.

3. The method for preparing a novel mortar admixture according to claim 2, characterized in that: The component ratios of the component A are 35-55% of recycled aggregate, 0.01-0.1% of defoamer, 10-15% of liquid viscosity modifier, 15-25% of surfactant and the balance of water.

4. The method for preparing a novel mortar admixture according to claim 2, characterized in that: The modifier comprises at least one of polyether polyol, sodium silicate and sodium hypophosphite. The recycled aggregate is soaked in the modifier and then dried for 7 to 10 hours. The particle size of the recycled aggregate in component A is 1 to 5 mm.

5. The method for preparing a novel mortar admixture according to claim 1, characterized in that: The component B comprises 25-45% of water reducing agent, 5-15% of water retaining agent and the balance of water.

6. The method for preparing a novel mortar admixture according to claim 1, characterized in that: The recycled aggregate comprises at least one of waste concrete, bricks and fly ash, the defoamer is a polyether defoamer, the liquid viscosity modifier is any one of polyvinyl alcohol and polyacrylamide, the surfactant is an air entraining agent, the water reducer is a polycarboxylic acid water reducer, and the water retaining agent is a cellulose ether composition.

7. Use of the mortar admixture according to any one of claims 1 to 6 in wet mixed mortar.