Environment-friendly premixed mortar for wall body and preparation method thereof

Abstract

The application discloses an environment-friendly premixed mortar for a wall body and a preparation method thereof. The environment-friendly premixed mortar comprises the following raw materials in percentage by mass: cement 17-23%, coarse aggregate 15-20%, fine aggregate 13-17%, treated blast furnace slag powder 21-28%, polypropylene fiber 5-9%, composite cellulose ether 1-2%, water reducing agent 0.2-5% and water 10-15%. 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 then grinding. The compactness, impermeability and impact resistance of the environment-friendly premixed mortar are improved, and the use performance of the premixed mortar is improved.

Description

Technical Field

[0001] This invention relates to an environmentally friendly premixed mortar for walls and its preparation method, belonging to the field of building materials technology. Background Technology

[0002] With the development of the construction industry and the increasing demands for civilized construction, ready-mixed mortar has been widely adopted as a new type of environmentally friendly building material. Ready-mixed mortar is a fine-aggregate concrete used in various mortar mixtures in construction projects. It consists of a certain proportion of cementitious materials, fine aggregates, and additives, and has many advantages such as less on-site pollution, good operability, and high project progress efficiency. However, existing ready-mixed mortars suffer from problems such as easy cracking and poor impermeability. Some ready-mixed mortars also contain blast furnace slag, but the porosity and metal ions of blast furnace slag affect the performance of the ready-mixed mortar. Therefore, this invention provides an environmentally friendly ready-mixed mortar and its preparation method to improve the density, impermeability, and impact resistance of the ready-mixed mortar, thereby enhancing its performance. Summary of the Invention

[0003] At least to address one of the problems existing in the prior art, the present invention provides an environmentally friendly premixed mortar for walls and its preparation method. This environmentally friendly premixed mortar is a new type of wall material, and its density, impermeability and impact resistance are improved, solving the problems of cracking and poor impermeability, and improving the performance of premixed mortar.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an environmentally friendly premixed mortar for walls, comprising the following raw materials, 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;

[0005] The processed blast furnace slag powder is obtained by mixing water-quenched and rapidly cooled blast furnace slag I and semi-quenched blast furnace slag II with composite heavy alkylbenzene sulfonate, and then grinding them.

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

[0007] (1) The molten blast furnace slag is fed into a water quenching tank to form water slag, and then it is scooped out, piled up and dehydrated to obtain blast furnace slag I;

[0008] (2) The molten blast furnace slag is rapidly cooled by the combined action of machinery and water to obtain blast furnace slag II;

[0009] (3) After mixing blast furnace slag I, blast furnace slag II and composite heavy alkylbenzene sulfonate evenly, grind them to form powder and obtain 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 and composite heavy alkylbenzene sulfonate is 1-1.5:2.5:0.1-0.2.

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

[0012] Preferably, in the composite alkylbenzene sulfonate, the mass ratio of sodium alkylbenzene sulfonate OBS-50 to sodium alkylbenzene sulfonate SAS-60 is 1:1 to 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 methylcellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether.

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

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

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

[0018] This invention also provides a method for preparing environmentally 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, then adding water and mixing at a speed of 400-500 r / min for 40-60 min to obtain premixed mortar.

[0019] The beneficial effects of this invention are as follows: 1) This invention prepares environmentally friendly premixed mortar by compounding and synergistically combining treated blast furnace slag powder with cement, coarse aggregate, fine aggregate, polypropylene fiber, and composite cellulose ether. This produces premixed mortar with high density, excellent compressive strength, impermeability, and water retention, making it a novel wall material. 2) The treated blast furnace slag powder of this invention, combined with water-quenched blast furnace slag I and semi-quenched blast furnace slag II, synergistically forms a stable and ductile structure within the mortar with composite heavy alkylbenzene sulfonate. This structure interacts with polypropylene fiber, filling the aggregate interface of the premixed mortar. This slows the expansion of micro-cracks within the material, improves the density and toughness of the premixed mortar, and enhances its crack resistance, impact resistance, and impermeability, thereby improving its usability. Yes; 3) The use of composite heavy alkylbenzene sulfonate in the premixed 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 dispersibility of cement, treated blast furnace slag powder, and polypropylene fiber in the premixed mortar. In addition, it combines with composite cellulose ether to form a strong adhesive bond between cement, treated blast furnace slag powder, polypropylene fiber and coarse aggregate and fine aggregate, thereby improving the various mechanical properties and durability of the premixed mortar. In addition, it can also solve the segregation problem of premixed mortar; 4) The combination of water-quenched blast furnace slag I and semi-quenched blast furnace slag II in the present invention improves the gel bonding strength between blast furnace slag and cement on the one hand, and improves the temperature difference adaptability of premixed mortar on the other hand, reducing cracking and poor impermeability, and further improving the performance of premixed mortar. Detailed Implementation

[0020] The following is a clear and complete description of the technical solutions in the implementation of this invention. The described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply.

[0021] Preliminary Example 1: Preparation of treated blast furnace slag powder

[0022] The preparation process of the treated blast furnace slag powder in this invention is as follows: (1) The molten blast furnace slag is fed into a water quenching tank to form water slag, and then it is taken out, piled up and dehydrated 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 composite heavy alkylbenzene sulfonate are mixed evenly and then ground to form powder with a particle size of 50-100μm to obtain treated blast furnace slag powder.

[0023] In this preliminary example 1, the water quenching and rapid cooling treatment adopts either the water slag soaking method or one of the water slag soaking methods. Rapid cooling treatment and semi-rapid cooling treatment are existing technologies and are not the focus of this invention, so they will not be described in detail.

[0024] Example 1

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

[0026] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0027] Example 2

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

[0029] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0030] Example 3

[0031] An environmentally friendly premixed mortar for walls comprises the following raw materials, by mass percentage: 20.5% cement, 15% coarse aggregate, 15.5% fine aggregate, 25.5% treated blast furnace slag powder, 8% polypropylene fiber, 1.5% composite cellulose ether, 0.4% polycarboxylate superplasticizer, and 13.6% water; the treated blast furnace slag powder is prepared according to the steps of Preliminary Example 1 with blast furnace slag I, blast furnace slag II, and composite heavy alkylbenzene sulfonate in a mass ratio of 1.25:2.5:0.15; wherein the composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60 in a mass ratio of 1:1.5;

[0032] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0033] Example 4

[0034] An environmentally friendly premixed mortar for walls comprises the following raw materials, by mass percentage: 18.5% cement, 17.5% coarse aggregate, 17% fine aggregate, 24.2% treated blast furnace slag powder, 6% polypropylene fiber, 1.5% composite cellulose ether, 0.3% polycarboxylate superplasticizer, and 15% water; the treated blast furnace slag powder is prepared according to the steps of Preliminary Example 1 with blast furnace slag I, blast furnace slag II, and composite heavy alkylbenzene sulfonate in a mass ratio of 1:2.5:0.1; wherein the composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60 in a mass ratio of 1:1.5;

[0035] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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 superplasticizer. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0036] Example 5

[0037] An environmentally friendly premixed mortar for walls comprises 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 superplasticizer, and 11% water; the treated blast furnace slag powder is prepared according to the steps of Preliminary 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 in a mass ratio of 1:1.5;

[0038] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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 superplasticizer. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0039] Example 6

[0040] An environmentally friendly premixed mortar for walls comprises 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 superplasticizer, and 12% water; the treated blast furnace slag powder is prepared according to the steps of Preliminary Example 1 with blast furnace slag I, blast furnace slag II, and composite heavy alkylbenzene sulfonate in a mass ratio of 1:2.5:0.1; wherein the composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60 in a mass ratio of 1:2;

[0041] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0042] Example 7

[0043] An environmentally friendly premixed mortar for walls comprises 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 Preliminary 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 in a mass ratio of 1:1.

[0044] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0045] Example 8

[0046] An environmentally friendly premixed mortar for walls comprises 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 Preliminary 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 in a mass ratio of 1:2;

[0047] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, 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 superplasticizer. Mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0048] Comparative Example 1

[0049] An environmentally friendly premixed mortar for walls, with the same raw materials and mass percentages as in Example 3, differs in that: the treated blast furnace slag powder of Comparative Example 1 is prepared according to the steps of Preliminary Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II and sodium dodecylbenzenesulfonate of 1.25:2.5:0.15, and sodium dodecylbenzenesulfonate of Comparative Example 1 is used instead of composite heavy alkylbenzenesulfonate.

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

[0051] Comparative Example 2

[0052] An environmentally friendly premixed mortar for walls, with raw materials and mass percentages being the same as those in Example 3, differs in that: in Comparative Example 2, the treated blast furnace slag powder is prepared according to the steps of Preliminary Example 1 with a mass ratio of blast furnace slag I, blast furnace slag II, and sodium heavy alkylbenzene sulfonate SAS-60 of 1.25:2.5:0.15; and in Comparative Example 2, sodium heavy alkylbenzene sulfonate SAS-60 is used instead of composite heavy alkylbenzene sulfonate.

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

[0054] Comparative Example 3

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

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

[0057] Comparative Example 4

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

[0060] Comparative Example 5

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

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

[0063] Comparative Example 6

[0064] An environmentally friendly premixed mortar for walls, with raw materials and mass percentages being the same as those in Example 3, except that: in Comparative Example 6, the treated blast furnace slag powder was prepared according to the steps of Preliminary Example 1 with a mass ratio of blast furnace slag II to a type of alkylbenzene sulfonate of 3.75:0.15, while in Comparative Example 6, only semi-quenched blast furnace slag II was used.

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

[0066] Comparative Example 7

[0067] An environmentally friendly premixed mortar for walls, with raw materials and mass percentages being the same as those in Example 3, except that: in Comparative Example 7, the treated blast furnace slag powder was prepared according to the steps of Preliminary Example 1 with a mass ratio of blast furnace slag I to a type of alkylbenzene sulfonate of 3.75:0.15, while in Comparative Example 6, only semi-quenched blast furnace slag I was used.

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

[0069] Comparative Example 8

[0070] An environmentally friendly premixed mortar for walls comprises the following raw materials, by weight percentage: 20.5% cement, 15% coarse aggregate, 15.5% fine aggregate, 25.5% treated blast furnace slag powder, 8% polypropylene fiber, 1.5% composite cellulose ether, 0.4% polycarboxylate superplasticizer, and 13.6% water.

[0071] The preparation process of the treated blast furnace slag powder in Comparative Example 7 is as follows: 1) Molten blast furnace slag is poured into a water quenching tank to form water slag, which is then scooped out, piled up, and dehydrated to obtain blast furnace slag I; 2) 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 composite heavy alkylbenzene sulfonate are mixed evenly at a mass ratio of 1.25:2.5:0.15 to obtain treated blast furnace slag powder; The treated blast furnace slag powder in Comparative Example 8 is not ground.

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

[0073] Comparative Example 9

[0074] An environmentally friendly premixed mortar for walls, with the same raw materials and mass percentages as in Example 2, except that hydroxypropyl methylcellulose ether is used instead of composite cellulose ether in Comparative Example 9.

[0075] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, add hydroxypropyl methylcellulose ether and polycarboxylate superplasticizer and mix evenly. Finally, add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0076] Comparative Example 10

[0077] An environmentally friendly premixed mortar for walls, with the same raw materials and mass percentages as in Example 2, except that hydroxyethyl cellulose ether in Comparative Example 9 is used instead of composite cellulose ether.

[0078] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber, then add hydroxyethyl cellulose and polycarboxylate superplasticizer and mix evenly, then add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0079] Comparative Example 11

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

[0081] The preparation process of 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 5-10mm, fine aggregate with a particle size of 1.5-3mm, treated blast furnace slag powder, and polypropylene fiber. Then, add carboxymethyl cellulose ether and polycarboxylate superplasticizer and mix evenly. Finally, add water and mix at a speed of 450r / min for 50min to obtain premixed mortar.

[0082] Comparative Example 12

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

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

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

[0086] Table 1 Performance

[0087]

[0088] As shown in Table 1, the environmentally friendly premixed mortars prepared by Examples 1-8 are significantly better than those prepared by Comparative Examples 1-11.

[0089] Compared with Comparative Examples 1-5 and Comparative Example 8, Example 3 uses a composite heavy alkylbenzene sulfonate composed of sodium OBS-50 and sodium SAS-60, which is ground together with blast furnace slag I and blast furnace slag II to form a stable and ductile structure in the premixed mortar. This improves the compressive strength, impermeability, water retention, bonding strength and density of the premixed mortar, and enhances its durability, thereby improving the performance of the premixed mortar.

[0090] Compared with Comparative Examples 6 and 7, Example 3 uses a combination of water-quenched blast furnace slag I and semi-quenched blast furnace slag II, which can promote the synergistic effect between blast furnace slag powder and other substances, increase the viscosity of premixed mortar and improve its durability, thereby improving the density, compressive strength, impermeability and other properties of premixed mortar, making the premixed mortar perform better.

[0091] Compared with Comparative Examples 9-11, Example 2 uses a composite cellulose ether composed of hydroxypropyl methylcellulose ether, hydroxyethyl cellulose ether, and carboxymethyl cellulose ether, which improves the dispersibility and water retention of the premixed mortar. In synergy with the composite heavy alkylbenzene sulfonate, it enables the cement, treated blast furnace slag powder, polypropylene fiber, coarse aggregate, and fine aggregate to form a strong adhesive, thereby improving the various mechanical properties and durability of the premixed mortar and solving the segregation problem of the premixed mortar.

[0092] Compared with Comparative Example 12, Example 2 uses polypropylene fiber, which, together with treated blast furnace slag powder, fills the interface between the aggregates of the premixed mortar, which can slow down the expansion of micro-cracks inside the material, improve the density and toughness of the premixed mortar, and enhance the crack resistance, impact resistance, and impermeability of the premixed mortar, thus helping to improve the performance of the premixed mortar.

[0093] In summary, the environmentally friendly premixed mortar prepared by this invention has high density and excellent impact resistance, impermeability, and water retention properties, solving the problems of cracking and poor impermeability, and improving the performance of premixed mortar. It is a new type of wall material.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit and essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0095] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 following raw materials are included, by weight percentage: cement 17-23%, coarse aggregate 15-20%, fine aggregate 13-17%, treated blast furnace slag powder 21-28%, polypropylene fiber 5-9%, composite cellulose ether 1-2%, water-reducing agent 0.2-5%, and water 10-15%. The process for preparing treated blast furnace slag powder is as follows: (1) The molten blast furnace slag is poured into a water quenching tank to form water slag, which is then scooped out, piled up and dehydrated 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) After mixing blast furnace slag I, blast furnace slag II and composite heavy alkylbenzene sulfonate evenly, grind them to form powder to obtain treated blast furnace slag powder; The composite heavy alkylbenzene sulfonate is composed of sodium heavy alkylbenzene sulfonate OBS-50 and sodium heavy alkylbenzene sulfonate SAS-60; The complex cellulose ether is composed of hydroxypropyl methylcellulose ether, hydroxyethyl cellulose ether and carboxymethyl cellulose ether.

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

2.

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

4. The environmentally friendly premixed mortar for walls according to claim 1, characterized in that, The particle size of the processed blast furnace slag powder is 50~100μm.

5. The environmentally friendly premixed mortar for walls according to claim 1, characterized in that, In the composite cellulose ether, the mass ratio of hydroxypropyl methylcellulose ether to hydroxyethyl cellulose ether and carboxymethyl cellulose ether is 2:1~1.5:0.5~1.

6. The environmentally friendly premixed mortar for walls according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate-based water-reducing agent.

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

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