Environment-friendly premixed mortar for wall and preparation method of environment-friendly premixed mortar

Abstract

The invention discloses environment-friendly premixed mortar for a wall body and a preparation method of the environment-friendly premixed mortar, the environment-friendly premixed mortar comprises the following raw materials in percentage by mass: 17-23% of cement, 15-20% of coarse aggregate, 13-17% of fine aggregate, 21-28% of treated blast furnace slag powder, 5-9% of polypropylene fiber, 1-2% of compound cellulose ether, 0.2-5% of a water reducing agent and 10-15% of water; the treated blast furnace slag powder is obtained by taking blast furnace slag I subjected to water quenching and quenching treatment and blast furnace slag II subjected to semi-quenching treatment as raw materials, mixing the raw materials with composite heavy alkylbenzene sulfonate and then grinding. According to the environment-friendly pre-mixed mortar, the compactness, the anti-permeability performance, the impact resistance and the like are all improved, and the use performance of the pre-mixed mortar is improved.

Description

Technical Field

[0001] The present invention relates to an environment-friendly premixed mortar for walls and a preparation method thereof, belonging to the technical field of building materials. Background Art

[0002] With the development of the construction industry and the requirements of civilized construction, premixed mortar, as a new type of environment-friendly building material, has been developed and applied. Premixed mortar is fine aggregate concrete, used for various mortar mixtures in construction projects, and is composed of a certain proportion of cementitious materials, fine aggregates, additives, etc. It has many advantages such as less on-site pollution, good operability, and high engineering progress efficiency. Existing premixed mortar has problems such as easy cracking and poor impermeability. Some premixed mortars also add blast furnace slag, but the porosity and metal ions of blast furnace slag affect the use performance of premixed mortar. Therefore, the present invention provides an environment-friendly premixed mortar for walls and a preparation method thereof to improve the compactness, impermeability, and impact resistance of premixed mortar and enhance its use performance. Summary of the Invention

[0003] At least aiming at one of the above problems existing in the prior art, the present invention provides an environment-friendly premixed mortar for walls and a preparation method thereof. This environment-friendly premixed mortar is a new type of wall material, and its compactness, impermeability performance, and impact resistance performance are all improved, solving the problems of cracking and poor impermeability, and enhancing the use performance of premixed mortar.

[0004] To achieve the above object, the present invention adopts the following technical scheme: An environment-friendly premixed mortar for walls, comprising the following raw materials, by mass percentage: 17 - 23% of cement, 15 - 20% of coarse aggregate, 13 - 17% of fine aggregate, 21 - 28% of treated blast furnace slag powder, 5 - 9% of polypropylene fiber, 1 - 2% of compound cellulose ether, 0.2 - 5% of water reducer, and 10 - 15% of water;

[0005] The treated blast furnace slag powder is prepared by using water-quenched and rapidly cooled blast furnace slag I and semi-rapidly cooled blast furnace slag II as raw materials, mixing with compound heavy alkylbenzene sulfonate, and then grinding.

[0006] Preferably, the preparation process of the treated blast furnace slag powder is as follows:

[0007] (1) Flowing the molten blast furnace slag into a water quenching pool to form water slag, and then fishing it out and piling it up for dehydration to obtain blast furnace slag I;

[0008] (2) Rapidly cooling the molten blast furnace slag by the combined action of machinery and water to obtain blast furnace slag II;

[0009] (3) Mixing blast furnace slag I, blast furnace slag II, and compound heavy alkylbenzene sulfonate evenly and then grinding to form a powder to obtain the treated blast furnace slag powder.

[0010] Preferably, in the treated blast furnace slag powder, the mass ratio of blast furnace slag I, blast furnace slag II to the composite heavy alkyl benzene sulfonate is 1 - 1.5:2.5:0.1 - 0.2.

[0011] Preferably, the composite heavy alkyl benzene sulfonate includes sodium heavy alkyl benzene sulfonate OBS - 50 and sodium heavy alkyl benzene sulfonate SAS - 60.

[0012] Preferably, in the composite heavy alkyl benzene sulfonate, the mass ratio of sodium heavy alkyl benzene sulfonate OBS - 50 to sodium heavy alkyl benzene sulfonate SAS - 60 is 1:1 - 2.

[0013] Preferably, the particle size of the treated blast furnace slag powder is 50 - 100 μm.

[0014] Preferably, the composite cellulose ether includes hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and carboxymethyl cellulose ether.

[0015] Preferably, in the composite cellulose ether, the mass ratio of hydroxypropyl methyl cellulose ether to hydroxyethyl cellulose ether and carboxymethyl cellulose ether is 2:1 - 1.5:0.5 - 1.

[0016] Preferably, the particle size of the coarse aggregate is controlled to be 5 - 10 mm; the particle size of the fine aggregate is controlled to be 1.5 - 3 mm.

[0017] Preferably, the water - reducing agent is a polycarboxylate - type water - reducing agent.

[0018] The present invention also provides a preparation method of an environment - friendly premixed mortar for walls, comprising the following steps: mixing cement, coarse aggregate, fine aggregate, treated blast furnace slag powder, and polypropylene fiber, then adding composite cellulose ether and water - reducing agent and mixing evenly, and then adding water, and mixing at a rotation speed of 400 - 500 r / min for 40 - 60 min to obtain the premixed mortar.

[0019] Advantages of the present invention: 1) By compounding and synergistically acting on the treated blast furnace slag powder with cement, coarse aggregate, fine aggregate, polypropylene fiber, and compound cellulose ether, the present invention can prepare an environmentally friendly ready-mixed mortar, obtaining a ready-mixed mortar with high density, excellent compressive strength, impermeability, and water retention performance, which is a new type of wall material; 2) The treated blast furnace slag powder of the present invention synergizes with blast furnace slag I treated by water quenching and rapid cooling and blast furnace slag II treated by semi-rapid cooling and compound heavy alkylbenzene sulfonate to form a stable and ductile structure in the mortar. Interacting with polypropylene fibers, it fills the interface between the aggregates of the ready-mixed mortar, can slow down the expansion of microcracks inside the material, improve the density and toughness of the ready-mixed mortar, and enhance the crack resistance, impact resistance, impermeability and other properties of the ready-mixed mortar, thereby improving the service performance of the ready-mixed mortar; 3) The compound heavy alkylbenzene sulfonate used in the ready-mixed mortar of the present invention not only promotes the formation of a stable and ductile structure between blast furnace slag I and blast furnace slag II, but also promotes the excellent dispersion of cement, treated blast furnace slag powder, and polypropylene fiber in the ready-mixed mortar. Combined with compound cellulose ether, it enables cement, treated blast furnace slag powder, polypropylene fiber to form a strong adhesion with coarse aggregate and fine aggregate, improves various mechanical properties and durability of the ready-mixed mortar, and can also solve the segregation problem of the ready-mixed mortar; 4) The combination of blast furnace slag I treated by water quenching and rapid cooling and blast furnace slag II treated by semi-rapid cooling in the present invention, on the one hand, improves the gel bonding strength between blast furnace slag and cement, and on the other hand, improves the temperature difference adaptability of the ready-mixed mortar, reduces problems such as cracking and poor impermeability, and further improves the service performance of the ready-mixed mortar. Detailed implementation mode

[0020] The following is a clear and complete description of the technical solutions in the implementation of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer.

[0021] Preparation example 1 Preparation of treated blast furnace slag powder

[0022] The preparation process of the treated blast furnace slag powder in the present invention is as follows: (1) The molten blast furnace slag flows into a water quenching tank to form granulated slag, and then is fished out and piled up for dehydration to obtain blast furnace slag I; (2) The molten blast furnace slag is rapidly cooled by the combined action of machinery and water to obtain blast furnace slag II; (3) Blast furnace slag I, blast furnace slag II, and compound heavy alkylbenzene sulfonate are mixed evenly and then ground to form a powder with a particle size of 50-100 μm to obtain the treated blast furnace slag powder.

[0023] In the water quenching and rapid cooling treatment in Preparation Example 1, the water slag method or one of the water slag methods is adopted. The rapid cooling treatment and semi-rapid cooling treatment are prior arts and not the focus of the present invention, so no specific description will be given.

[0024] Example 1

[0025] An environment-friendly premixed mortar for walls comprises the following raw materials by mass percentage: 17% of cement, 18% of coarse aggregate, 16.8% of fine aggregate, 28% of treated blast furnace slag powder, 9% of polypropylene fiber, 1% of compound cellulose ether, 0.2% of polycarboxylate superplasticizer and 10% of water; in the treated blast furnace slag powder, the mass ratio of blast furnace slag I, blast furnace slag II to compound heavy alkyl benzene sulfonate is 1.25:2.5:0.15 and it is prepared according to the steps of Preparation Example 1; wherein the compound heavy alkyl benzene sulfonate is composed of sodium dodecylbenzene sulfonate OBS-50 and sodium dodecylbenzene sulfonate SAS-60 with a mass ratio of 1:1.5;

[0026] Preparation process of the environment-friendly premixed mortar: first weigh the raw materials according to the above mass percentages, then mix cement, coarse aggregate with a particle size of 5-10 mm, fine aggregate with a particle size of 1.5-3 mm, treated blast furnace slag powder and polypropylene fiber, then add compound cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and carboxymethyl cellulose ether with a mass ratio of 2:1.25:0.75 and polycarboxylate superplasticizer and mix evenly, and then add water and mix at a speed of 450 r / min for 50 min to obtain the premixed mortar.

[0027] Example 2

[0028] An environment-friendly premixed mortar for walls comprises the following raw materials by mass percentage: 23% of cement, 20% of coarse aggregate, 13.5% of fine aggregate, 21% of treated blast furnace slag powder, 5% of polypropylene fiber, 2% of compound cellulose ether, 0.5% of polycarboxylate superplasticizer and 15% of water; in the treated blast furnace slag powder, the mass ratio of blast furnace slag I, blast furnace slag II to compound heavy alkyl benzene sulfonate is 1.25:2.5:0.15 and it is prepared according to the steps of Preparation Example 1; wherein the compound heavy alkyl benzene sulfonate is composed of sodium dodecylbenzene sulfonate OBS-50 and sodium dodecylbenzene sulfonate SAS-60 with a mass ratio of 1:1.5;

[0029] Preparation process of environment-friendly ready-mixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1.25:0.75, and a polycarboxylate-based water reducer and mix them evenly. Then, add water and mix at a speed of 450 r / min for 50 min to obtain the ready-mixed mortar.

[0030] Example 3

[0031] An environment-friendly ready-mixed mortar for wall includes the following raw materials, by mass percentage: 20.5% of cement, 15% of coarse aggregate, 15.5% of fine aggregate, 25.5% of treated blast furnace slag powder, 8% of polypropylene fiber, 1.5% of composite cellulose ether, 0.4% of polycarboxylate-based water reducer, and 13.6% of water; the treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and composite heavy alkyl benzene sulfonate of 1.25:2.5:0.15; wherein the composite heavy alkyl benzene sulfonate is composed of sodium dodecylbenzene sulfonate OBS-50 and sodium dodecylbenzene sulfonate SAS-60 in a mass ratio of 1:1.5.

[0032] Preparation process of environment-friendly ready-mixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1.25:0.75, and a polycarboxylate-based water reducer and mix them evenly. Then, add water and mix at a speed of 450 r / min for 50 min to obtain the ready-mixed mortar.

[0033] Example 4

[0034] An environment-friendly ready-mixed mortar for wall includes the following raw materials, by mass percentage: 18.5% of cement, 17.5% of coarse aggregate, 17% of fine aggregate, 24.2% of treated blast furnace slag powder, 6% of polypropylene fiber, 1.5% of composite cellulose ether, 0.3% of polycarboxylate-based water reducer, and 15% of water; the treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and composite heavy alkyl benzene sulfonate of 1:2.5:0.1; wherein the composite heavy alkyl benzene sulfonate is composed of sodium dodecylbenzene sulfonate OBS-50 and sodium dodecylbenzene sulfonate SAS-60 in a mass ratio of 1:1.5.

[0035] Preparation process of environment-friendly premixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1:0.5, and a polycarboxylate-based water reducer and mix evenly. Then, add water and mix at a rotation speed of 450 r / min for 50 min to obtain the premixed mortar.

[0036] Example 5

[0037] An environment-friendly premixed mortar for walls, comprising the following raw materials, by mass percentage: 21% cement, 18% coarse aggregate, 15% fine aggregate, 26.6% treated blast furnace slag powder, 7% polypropylene fiber, 1% composite cellulose ether, 0.4% polycarboxylate-based water reducer, and 11% water; the treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and composite heavy alkyl benzene sulfonate of 1.5:2.5:0.2; wherein the composite heavy alkyl benzene sulfonate is composed of sodium heavy alkyl benzene sulfonate OBS-50 and sodium heavy alkyl benzene sulfonate SAS-60 with a mass ratio of 1:1.5.

[0038] Preparation process of environment-friendly premixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1.5:1, and a polycarboxylate-based water reducer and mix evenly. Then, add water and mix at a rotation speed of 450 r / min for 50 min to obtain the premixed mortar.

[0039] Example 6

[0040] An environment-friendly premixed mortar for walls, comprising the following raw materials, by mass percentage: 20% cement, 17% coarse aggregate, 17% fine aggregate, 23% treated blast furnace slag powder, 8.5% polypropylene fiber, 2% composite cellulose ether, 0.5% polycarboxylate-based water reducer, and 12% water; the treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and composite heavy alkyl benzene sulfonate of 1:2.5:0.1; wherein the composite heavy alkyl benzene sulfonate is composed of sodium heavy alkyl benzene sulfonate OBS-50 and sodium heavy alkyl benzene sulfonate SAS-60 with a mass ratio of 1:2.

[0041] Preparation process of environment-friendly ready-mixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1.25:0.75, and a polycarboxylate superplasticizer and mix evenly. Then add water and mix at a rotation speed of 450 r / min for 50 min to obtain the ready-mixed mortar.

[0042] Example 7

[0043] An environment-friendly ready-mixed mortar for walls, comprising the following raw materials, by mass percentage: 23% cement, 15% coarse aggregate, 16% fine aggregate, 24% treated blast furnace slag powder, 5% polypropylene fiber, 2% composite cellulose ether, 0.5% polycarboxylate superplasticizer, and 14.5% water; the treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and composite heavy alkylbenzene sulfonate of 1.5:2.5:0.2; wherein the composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60 with a mass ratio of 1:1.

[0044] Preparation process of environment-friendly ready-mixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1:1, and a polycarboxylate superplasticizer and mix evenly. Then add water and mix at a rotation speed of 450 r / min for 50 min to obtain the ready-mixed mortar.

[0045] Example 8

[0046] An environment-friendly ready-mixed mortar for walls, comprising the following raw materials, by mass percentage: 19% cement, 17% coarse aggregate, 13% fine aggregate, 27% treated blast furnace slag powder, 8% polypropylene fiber, 1.5% composite cellulose ether, 0.5% polycarboxylate superplasticizer, and 14% water; the treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and composite heavy alkylbenzene sulfonate of 1.5:2.5:0.1; wherein the composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60 with a mass ratio of 1:2.

[0047] Preparation process of environment-friendly premixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether in a mass ratio of 2:1.5:0.5, and a polycarboxylate-based water reducer and mix them evenly. Then, add water and mix at a speed of 450 r / min for 50 min to obtain the premixed mortar.

[0048] Comparative Example 1

[0049] An environment-friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3. The difference lies in that: in the treated blast furnace slag powder of Comparative Example 1, the mass ratio of blast furnace slag I, blast furnace slag II, and sodium dodecylbenzenesulfonate is 1.25:2.5:0.15, and it is prepared according to the steps of Preparation Example 1. The sodium dodecylbenzenesulfonate in Comparative Example 1 replaces the composite heavy alkylbenzene sulfonate;

[0050] The preparation process of the environment-friendly premixed mortar is the same as that in Example 3.

[0051] Comparative Example 2

[0052] An environment-friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3. The difference lies in that: in the treated blast furnace slag powder of Comparative Example 2, the mass ratio of blast furnace slag I, blast furnace slag II, and sodium dodecylbenzenesulfonate SAS - 60 is 1.25:2.5:0.15, and it is prepared according to the steps of Preparation Example 1; the sodium dodecylbenzenesulfonate SAS - 60 in Comparative Example 2 replaces the composite heavy alkylbenzene sulfonate;

[0053] The preparation process of the environment-friendly premixed mortar is the same as that in Example 3.

[0054] Comparative Example 3

[0055] An environment-friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3. The difference lies in that: in the treated blast furnace slag powder of Comparative Example 3, the mass ratio of blast furnace slag I, blast furnace slag II, and composite alkylbenzene sulfonate is 1.25:2.5:0.15, and it is prepared according to the steps of Preparation Example 1; the composite alkylbenzene sulfonate is composed of sodium dodecylbenzenesulfonate SAS - 60 and sodium dodecylbenzenesulfonate in a mass ratio of 1:1.5, and it replaces the heavy alkylbenzene sulfonate in Example 3;

[0056] The preparation process of the environment-friendly premixed mortar is the same as that in Example 3.

[0057] Comparative Example 4

[0058] An environmentally friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3, the difference being that in the treated blast furnace slag powder of Comparative Example 4, the mass ratio of blast furnace slag I, blast furnace slag II to the composite alkylbenzene sulfonate is 1.25:2.5:0.15 and it is prepared according to the steps of Preparation Example 1; wherein the composite alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium dodecylbenzene sulfonate with a mass ratio of 1:1.5, replacing the heavy alkylbenzene sulfonate;

[0059] The preparation process of the environmentally friendly premixed mortar is the same as that of Example 3.

[0060] Comparative Example 5

[0061] An environmentally friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3, the difference being that in the treated blast furnace slag powder of Comparative Example 5, the mass ratio of blast furnace slag I to blast furnace slag II is 1.25:2.5, and no composite heavy alkylbenzene sulfonate is added, and it is prepared according to the grinding steps of Preparation Example 1. Comparative Example 5 does not contain the composite heavy alkylbenzene sulfonate;

[0062] The preparation process of the environmentally friendly premixed mortar is the same as that of Example 3.

[0063] Comparative Example 6

[0064] An environmentally friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3, the difference being that in the treated blast furnace slag powder of Comparative Example 6, the mass ratio of blast furnace slag II to the alkylbenzene sulfonate is 3.75:0.15 and it is prepared according to the steps of Preparation Example 1. Comparative Example 6 only uses semi-quenched blast furnace slag II;

[0065] The preparation process of the environmentally friendly premixed mortar is the same as that of Example 3.

[0066] Comparative Example 7

[0067] An environmentally friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 3, the difference being that in the treated blast furnace slag powder of Comparative Example 7, the mass ratio of blast furnace slag I to the alkylbenzene sulfonate is 3.75:0.15 and it is prepared according to the steps of Preparation Example 1. Comparative Example 6 only uses semi-quenched blast furnace slag I;

[0068] The preparation process of the environmentally friendly premixed mortar is the same as that of Example 3.

[0069] Comparative Example 8

[0070] An environment-friendly premixed mortar for walls, comprising the following raw materials, by mass percentage: cement 20.5%, coarse aggregate 15%, fine aggregate 15.5%, treated blast furnace slag powder 25.5%, polypropylene fiber 8%, compound cellulose ether 1.5%, polycarboxylate-based water reducer 0.4% and water 13.6%;

[0071] The preparation process of the treated blast furnace slag powder in Comparative Example 7: 1) The molten blast furnace slag flows into a water quenching pool to form water slag, and then it is fished out and piled up for dehydration to obtain blast furnace slag I; 2) The molten blast furnace slag is rapidly cooled by the combined action of machinery and water to obtain blast furnace slag II; 3) Blast furnace slag I, blast furnace slag II, and compound heavy alkyl benzene sulfonate are mixed evenly according to a mass ratio of 1.25:2.5:0.15 to obtain the treated blast furnace slag powder; The treated blast furnace slag powder in Comparative Example 8 is not ground;

[0072] The preparation process of the environment-friendly premixed mortar is the same as that of Example 3.

[0073] Comparative Example 9

[0074] An environment-friendly premixed mortar for walls, the raw materials and mass percentages are partially the same as those in Example 2, the difference lies in that: the hydroxypropyl methyl cellulose ether in Comparative Example 9 is used instead of the compound cellulose ether;

[0075] The preparation process of the environment-friendly premixed mortar: First, weigh the raw materials according to the above mass percentages, then mix cement, coarse aggregate with a particle size of 5-10 mm, fine aggregate with a particle size of 1.5-3 mm, treated blast furnace slag powder, and polypropylene fiber, and then add the mixture of hydroxypropyl methyl cellulose ether and polycarboxylate-based water reducer and mix evenly, and then add water, and mix at a rotation speed of 450 r / min for 50 min to obtain the premixed mortar.

[0076] Comparative Example 10

[0077] An environment-friendly premixed mortar for walls, the raw materials and mass percentages are partially the same as those in Example 2, the difference lies in that: the hydroxyethyl cellulose ether in Comparative Example 9 is used instead of the compound cellulose ether;

[0078] The preparation process of the environment-friendly premixed mortar: First, weigh the raw materials according to the above mass percentages, then mix cement, coarse aggregate with a particle size of 5-10 mm, fine aggregate with a particle size of 1.5-3 mm, treated blast furnace slag powder, and polypropylene fiber, and then add the mixture of hydroxyethyl cellulose and polycarboxylate-based water reducer and mix evenly, and then add water, and mix at a rotation speed of 450 r / min for 50 min to obtain the premixed mortar.

[0079] Comparative Example 11

[0080] An environmentally friendly premixed mortar for walls, with the raw materials and mass percentages being partially the same as those in Example 2, the difference being that the carboxymethyl cellulose ether in Comparative Example 9 is used instead of the composite cellulose ether;

[0081] Preparation process of the environmentally friendly premixed mortar: First, weigh the raw materials according to the above mass percentages. Then, mix cement, coarse aggregate with a particle size of 5 - 10 mm, fine aggregate with a particle size of 1.5 - 3 mm, treated blast furnace slag powder, and polypropylene fiber. After that, add the mixture of carboxymethyl cellulose ether and polycarboxylate superplasticizer and mix evenly. Then add water and mix at a rotation speed of 450 r / min for 50 min to obtain the premixed mortar.

[0082] Comparative Example 12

[0083] An environmentally friendly premixed mortar for walls, including the following raw materials, by mass percentage: cement 23%, coarse aggregate 20%, fine aggregate 13.5%, treated blast furnace slag powder 26%, composite cellulose ether 2%, polycarboxylate superplasticizer 0.5%, and water 15%; The treated blast furnace slag powder is prepared according to the steps of Preparation Example 1 with the mass ratio of blast furnace slag I, blast furnace slag II to composite heavy alkylbenzene sulfonate being 1.25:2.5:0.15; Among them, the composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS - 50 and sodium heavy alkylbenzene sulfonate SAS - 60 with a mass ratio of 1:1.5. Comparative Example 9 does not contain polypropylene fiber;

[0084] The preparation process of the environmentally friendly premixed mortar is the same as that of Example 2.

[0085] According to the requirements of GB / T25181 - 2010 and JGJ / T70 - 2009, the environmentally friendly premixed mortars prepared in the above Examples 1 - 8 and Comparative Examples 1 - 11 were measured to detect the water retention rate, water absorption rate, bond strength, loss rate (freeze resistance), and compressive strength, flexural strength, and impermeability pressure after 28 days. The results are shown in Table 1.

[0086] Table 1 Performance

[0087]

[0088] As can be seen from Table 1, the effects of the environmentally friendly premixed mortars prepared through Examples 1 - 8 are significantly better than those of the environmentally friendly premixed mortars prepared through Comparative Examples 1 - 11.

[0089] Compared with Comparative Examples 1-5 and Comparative Example 8, Example 3 uses a treated blast furnace slag powder obtained by co-grinding a composite heavy alkylbenzene sulfonate composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60 with blast furnace slag I and blast furnace slag II, forming a stable and ductile structure in the ready-mixed mortar, which can improve the performance of the ready-mixed mortar such as compressive strength, impermeability, water retention, bond strength and compactness, and has better durability, thus enhancing the service performance of the ready-mixed mortar.

[0090] Compared with Comparative Examples 6 and 7, Example 3 combines water-quenched and rapidly cooled blast furnace slag I and semi-rapidly cooled blast furnace slag II, which can promote the synergistic effect between the blast furnace slag powder and other substances, improve the viscosity of the ready-mixed mortar while enhancing its durability, thereby enhancing the compactness, compressive strength, impermeability and other properties of the ready-mixed mortar, making the service performance of the ready-mixed mortar better.

[0091] Compared with Comparative Examples 9-11, Example 2 uses a composite cellulose ether composed of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and carboxymethyl cellulose ether, which makes the dispersibility and water retention of the ready-mixed mortar better. When combined with the composite heavy alkylbenzene sulfonate, it forms a strong adhesion between cement, treated blast furnace slag powder, polypropylene fiber, coarse aggregate and fine aggregate, improving various mechanical properties and durability of the ready-mixed mortar, and also solving the segregation problem of the ready-mixed mortar.

[0092] Compared with Comparative Example 12, Example 2 uses polypropylene fiber. When it synergistically fills the interface between the aggregates of the ready-mixed mortar with the treated blast furnace slag powder, it can slow down the expansion of microcracks inside the material, improve the compactness and toughness of the ready-mixed mortar, and enhance the crack resistance, impact resistance, impermeability and other properties of the ready-mixed mortar, which helps to improve the service performance of the ready-mixed mortar.

[0093] In summary, the environmentally friendly ready-mixed mortar prepared by the present invention has a high degree of compactness, excellent impact resistance, impermeability, water retention performance, etc., solves the problems of cracking and poor impermeability, improves the service performance of the ready-mixed mortar, and is a new type of wall material.

[0094] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit and basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0095] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An environmentally friendly premixed mortar for walls, characterized in that: The invention comprises the following raw materials, calculated by mass percentage: 17-23% cement, 15-20% coarse aggregate, 13-17% fine aggregate, 21-28% treated blast furnace slag powder, 5-9% polypropylene fiber, 1-2% composite cellulose ether, 0.2-5% water reducing agent and 10-15% water; The treated blast furnace slag powder is obtained by mixing water quenched blast furnace slag I and semi-quenched blast furnace slag II with composite heavy alkyl benzene sulfonate and grinding them.

2. The environmentally friendly premixed mortar for wall according to claim 1, characterized in that: In the treated blast furnace slag powder, the mass ratio of blast furnace slag I, blast furnace slag II and composite heavy alkyl benzene sulfonate is 1-1.5:2.5:0.1-0.

2.

3. The environmentally friendly premixed mortar for wall according to claim 1 or 2, characterized in that: The composite heavy alkylbenzene sulfonate includes heavy sodium alkylbenzene sulfonate OBS-50 and heavy sodium alkylbenzene sulfonate SAS-60.

4. The environmentally friendly premixed mortar for wall according to claim 3, characterized in that: In the composite heavy alkylbenzene sulfonate, the mass ratio of heavy alkylbenzene sulfonate sodium OBS-50 to heavy alkylbenzene sulfonate sodium SAS-60 is 1:1-2.

5. The environmentally friendly premixed mortar for wall according to claim 1, characterized in that: The particle size of the treated blast furnace slag powder is 50 to 100 μm.

6. The environmentally friendly premixed mortar for wall according to claim 1, characterized in that: The preparation process of treated blast furnace slag powder is as follows: (1) The molten blast furnace slag is flowed into a water quenching tank to form water slag, which is then removed and piled up for dehydration to obtain blast furnace slag I; (2) rapidly cooling the molten blast furnace slag by mechanical and water action to obtain blast furnace slag II; (3) Blast furnace slag I, blast furnace slag II, and composite heavy alkylbenzene sulfonate are uniformly mixed and then ground to form powder to obtain treated blast furnace slag powder.

7. The environmentally friendly premixed mortar for wall according to claim 1, characterized in that: The composite cellulose ethers include hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and carboxymethyl cellulose ether.

8. The environmentally friendly premixed mortar for wall according to claim 7, characterized in that: In the composite cellulose ether, the mass ratio of hydroxypropyl methyl cellulose ether to hydroxyethyl cellulose ether and carboxymethyl cellulose ether is 2:1-1.5:0.5-1.

9. The environmentally friendly premixed mortar for wall according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid water reducing agent.

10. A method for preparing the environmentally friendly premixed mortar according to claim 1, characterized in that: The following steps are involved: Cement, coarse aggregate, fine aggregate, treated blast furnace slag powder and polypropylene fiber are mixed, and then composite cellulose ether and water reducing agent are added and mixed evenly, and then water is added and mixed at a speed of 400-500 r / min for 40-60 minutes to obtain premixed mortar.

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