CN105801023B - A kind of cement base premixing dry-mixed mortar for 3D printing - Google Patents

Abstract

The invention relates to the field of building materials, in particular to a cement-based ready-mixed dry-mixed mortar for 3D printing, which is mainly composed of the following raw materials, in parts by weight, 200-250 parts of cement and 700-800 parts of fine aggregate , 5-6 parts of coagulation accelerator, 0.2-0.4 part of air-entraining agent, 0.8-1.5 parts of composite additive; wherein, the composite additive includes starch mud, water reducing agent and renewable latex powder, starch mud, water reducing agent, The weight ratio of renewable latex powder is 9‑14:1‑1.5:15‑20. The invention mixes cement, fine aggregate, coagulation accelerator, air-entraining agent and compound additives of specific components in a specific proportion, and the cement-based ready-mixed dry-mixed mortar for 3D printing has good bonding performance and is compatible with The wall has strong adhesion, easy to construct, and will not cause problems such as hollowing and cracking; the initial setting time and curing period are shortened, and the compressive strength of the coating layer is high, with a compressive strength of more than 10 MPa.

Description

A cement-based ready-mixed dry-mix mortar for 3D printing

technical field

The invention relates to the field of building materials, in particular to a cement-based ready-mixed dry-mixed mortar for 3D printing.

Background technique

The existing cement mortar takes a long time to solidify during use, which affects the progress of construction. In addition, concrete has strong drying shrinkage, and the production process is complex, which is prone to quality fluctuations, and is prone to common problems such as cracks, missing edges, dropped corners, pitted surfaces, honeycombs, and exposed ribs.

Ready-mixed mortar refers to the mixture composed of cement, sand and the required admixtures and admixtures according to a certain proportion, after centralized metering and mixing, transported and used by special equipment. Ready-mixed mortar includes ready-mixed dry-mixed mortar and ready-mixed wet mortar. The country promotes the use of bulk ready-mixed dry-mixed mortar.

Ready-mixed dry-mixed mortar (referred to as dry-mixed mortar) is a multi-component granular or powdery mixture. The formula meets different building requirements and construction requirements. In addition to cement, inorganic cementitious materials such as gypsum and lime can also be used. Sand generally needs to be screened and dried. In addition to natural sand (river sand, mountain sand), artificial sand can also be used as aggregate (aggregate). Chemical additives are mainly organic polymer admixtures that can be added according to national standards. . Ready-mixed dry-mixed mortar is produced and sold by professional mortar companies, and delivered to the construction site in bags or in bulk. During construction, add water according to the specified ratio and mix it evenly before using it.

At present, there is no mature cement-based ready-mixed dry-mixed mortar announced.

In view of this, the present invention is proposed.

Contents of the invention

The purpose of the present invention is to provide a cement-based ready-mixed dry-mixed mortar for 3D printing. The ready-mixed dry-mixed mortar has high compressive strength, strong binding force, short initial setting time, and reduces maintenance time of the construction period, which is beneficial to Fast progress of construction period.

In order to realize the above-mentioned purpose of the present invention, special adopt following technical scheme:

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is mainly composed of the following raw materials, in parts by weight, 200-250 parts of cement, 700-800 parts of fine aggregate, and 5-6 parts of accelerator parts, air-entraining agent 0.2-0.4 parts, composite additive 0.8-1.5 parts;

Wherein, the composite additive includes starch mud, water reducer and renewable latex powder, and the weight ratio of the starch mud, water reducer and renewable latex powder is 9-14:1-1.5:15-20.

The cement-based ready-mixed dry-mixed mortar for 3D printing provided by the present invention uses cement and fine aggregate as the main raw materials, supplemented by coagulation accelerators, air-entraining agents and composite additives, wherein the coagulation accelerators shorten The setting time of concrete improves the early strength; the air-entraining agent improves the slump, fluidity and plasticity of the concrete; And, the amount of water used is reduced; the renewable latex powder has a bonding function and increases the surface strength of the coated body. The cement-based ready-mixed dry-mixed mortar for 3D printing provided by the present invention strengthens the synergistic cooperation among the raw materials, adds water to mix and coat the wall body, has good bonding performance, strong bonding force with the wall surface, is easy to construct, and does not produce voids. Bubbles, cracks, etc.; the initial setting time of the existing cement premix is about 2 hours, but the initial setting time of the ready-mixed dry-mixed mortar provided by the invention is shortened by 1 hour, and the time required for the initial setting is short, which is beneficial to the construction period The rapid progress of the construction period; the maintenance period is shortened from about one month to about 3 weeks, and the maintenance period is shortened by at least one week, which reduces the maintenance time of the construction period and facilitates the rapid progress of the construction period; the coating obtained by coating the wall with the ready-mixed dry-mixed mortar The cladding has high compressive strength, and the compressive strength can reach more than 10 MPa.

The cement used in the present invention can be commercially available Pc42.5 cement, Pc32.5 cement and the like.

Preferably, the fine aggregate is selected from one or more of machine-made sand, construction waste sand, slag powder, fly ash, phosphorus slag, broken aerated brick waste and polyphenylene particles.

Machine-made sand refers to sand processed by sand making machines and other auxiliary equipment. The finished product is more regular and can be processed into sand of different rules and sizes according to different process requirements, which can better meet daily needs. Adding a specific content of machine-made sand can effectively improve the firmness and durability of the coating.

Construction waste sand is obtained by crushing and screening construction waste many times to realize the recycling of construction waste, which is environmentally friendly and cost-saving, and the obtained cement-based ready-mixed dry-mixed mortar has superior comprehensive performance.

Slag powder is the abbreviation of granulated blast furnace slag powder. It is a high-quality concrete admixture. It is made of granulated blast furnace slag that meets the GB/T203 standard. body. By adding a specific content of slag powder, it is not only environmentally friendly, but also can increase the comprehensive performance of cement-based ready-mixed dry-mixed mortar.

Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. By adding a specific content of fly ash, it is not only environmentally friendly, but also can increase the comprehensive performance of cement-based ready-mixed dry-mixed mortar. The fly ash used in the present invention has no special requirements on its grade. Generally used fly ash is grade I, grade II or special grade, as long as it meets the construction requirements of ready-mixed dry-mixed mortar. Phosphorus slag is ground and processed into fine powder, and its activity is stimulated as a new type of building material for high-performance concrete admixture, which can replace 10-50% of cement in the same amount of concrete production. Phosphorus slag is used as one of the raw materials to make full use of industrial waste slag and reduce environmental pollution.

Aerated brick waste block broken material and polystyrene particles mainly play the functions of heat preservation, loosening and filling. By adding a specific content of aerated brick waste block fragments and/or polyphenylene particles, the cement-based ready-mixed dry-mixed mortar maintains a loose state between the raw materials, increases the filling function, and makes the resulting coating The layer has very good thermal insulation properties.

It has been verified by experiments that the cement-based ready-mixed dry-mixed mortar made of fine aggregate obtained from the following composition ratio has excellent comprehensive performance.

Further, the fine aggregate is a mixture of machine-made sand, construction waste sand and fly ash at a mass ratio of 10:(3-5):(0.5-1.5). The cement-based ready-mixed dry-mixed mortar made of the fine aggregate obtained by using the composition ratio can also effectively improve the firmness and durability of the coating layer, and the cost is low.

Further, the fine aggregate is a mixture of construction waste sand and fly ash in a mass ratio of (13-15):1. The cement-based ready-mixed dry-mixed mortar made of the fine aggregate obtained by using the composition ratio can also effectively improve the firmness and durability of the coating layer, and the cost is low.

Further, the aggregate is a mixture of construction waste sand, slag powder, fly ash and phosphorus slag in a mass ratio of 12:(0.5-1.5):(1.5-2.5):(0.5-1.5). The cement-based ready-mixed dry-mixed mortar made of the fine aggregate obtained by using the composition ratio has better bonding performance, is easier to mix with water, does not sag, increases the ease of coating, and is low in cost.

Further, the fine aggregate is construction waste sand, broken aerated brick waste, slag powder and polyphenylene particles in a mass ratio of 100:(30-50):(5-7):(3-5) mixture. The cement-based ready-mixed dry-mixed mortar made of the fine aggregate obtained by using the composition ratio also increases the thermal insulation performance of the coating layer and has low cost.

Further, the fine aggregate is construction waste sand, broken aerated brick waste, slag powder and phosphorus slag in a mass ratio of 10:(3-5):(0.5-1.5):(0.5-1.5) mixture. The cement-based ready-mixed dry-mixed mortar made of the fine aggregate obtained by the ratio of the ingredients takes into account the thermal insulation performance, bonding performance, compressive strength and durability, and the comprehensive performance is more excellent.

In order to make the fine aggregate mixed with other raw materials more uniformly, and the performance of the obtained cement-based ready-mixed dry-mixed mortar is more excellent, preferably, the particle size of the slag powder and the phosphorus slag is not less than 300 mesh, The particle size of the fly ash is above 120 mesh, and the water content is below 1%; the particle size of the waste aerated brick pulverized material is below 2.5mm, and the particle size of the polyphenylene particles is below 4mm.

Further, the raw material also includes 0.5-1 parts by weight of shredded strips of waste woven bags. Adding waste woven bag broken strips to the cement-based ready-mixed dry-mixed mortar not only utilizes waste, is environmentally friendly, and has low cost, but also plays a role in connecting, increasing the integrity of the raw materials of the cement-based ready-mixed dry-mixed mortar, increasing the Ease of application.

Furthermore, the width of the waste woven bag shreds is 3-5mm, and the length is 6mm-8cm. According to the test, the waste woven bag crushing strip of this size is conducive to the uniform mixing of various raw materials, and achieves a good connection effect, prevents problems such as falling debris during the coating process, and increases the integrity of the coating layer after drying .

Further, the composite additive also includes a water-retaining agent, and the water-retaining agent accounts for 65%-72% of the weight of the composite additive. Composite additives and water-retaining agents are mainly suitable for cement-based ready-mixed dry-mixed mortars used at temperatures above 30°C, which can effectively prevent dry cracks and hollowing caused by excessive use temperatures.

Further, the water retaining agent is cellulose ether; the viscosity of the cellulose ether is preferably above 200,000 units. Cellulose ether solves the water retention of mortar, prolongs the construction time, keeps the mortar sufficient moisture for a long time, prevents segregation, and has good plasticity; cellulose ether itself also has an air-entraining effect, and can also stabilize the uniform fine air bubbles introduced into the mortar . After screening, cellulose ether with a viscosity of more than 200,000 units has the best modification effect.

Compared with prior art, the beneficial effect of the present invention is:

(1) The present invention mixes specific proportions of cement, fine aggregate, coagulation accelerator, air-entraining agent, and composite additives of specific components to prepare cement-based ready-mixed dry-mixed mortar for 3D printing. Good, strong bonding with the wall, easy construction, no hollowing, cracking and other problems; shorten the initial setting time and curing period, and the coating layer has high compressive strength, the compressive strength can reach more than 10 MPa.

(2) The present invention also limits the types of fine aggregates, and through multiple tests, fine aggregates made of different components in a certain proportion are obtained, so that the prepared cement-based ready-mixed dry-mixed mortar is environmentally friendly and inexpensive Inexpensive, and the overall performance is better.

(3) The present invention also adds waste and old woven bag broken strips to the raw materials, which not only utilizes waste, is environmentally friendly, has low cost, and also plays a role in connecting, increasing the integrity of the raw materials of cement-based ready-mixed dry-mixed mortar, Increased ease of application.

(4) The present invention also adds a water-retaining agent to the raw materials according to the difference in use temperature, and limits the type and amount of the water-retaining agent to prevent cracking and hollowing caused by excessive use temperature.

detailed description

Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention, and should not be considered as limiting the scope of the present invention. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

Example 1

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg cement, 500kg machine-made sand, 200kg construction waste sand, 50kg fly ash, 6kg accelerator and 0.3 air-entraining agent kg, compound additive 1kg;

Among them, the composite additive includes starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 10:1:18;

The particle size of the fly ash is above 120 mesh, and the water content is below 1%.

Example 2

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 200kg cement, 500kg machine-made sand, 150kg construction waste sand, 75kg fly ash, 5kg accelerator and 0.2 air-entraining agent kg, compound additive 0.8kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 14:1.5:20;

The particle size of the fly ash is above 120 mesh, and the water content is below 1%.

Example 3

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 220kg cement, 500kg machine-made sand, 250kg construction waste sand, 25kg fly ash, 6kg accelerator and 0.4 air-entraining agent kg, compound additive 1.5kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 9:1:15;

The particle size of the fly ash is above 120 mesh, and the water content is below 1%.

Example 4

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg of cement, 700kg of construction waste sand, 50kg of fly ash, 6kg of accelerator, 0.3kg of air-entraining agent, and composite additives 1kg;

Among them, the composite additive includes starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 12:1.5:15;

The particle size of the fly ash is above 120 mesh, and the water content is below 1%.

Example 5

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg of cement, 650kg of construction waste sand, 50kg of fly ash, 5kg of accelerator, 0.3kg of air-entraining agent, and composite additives 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 12:1.5:18;

The particle size of the fly ash is above 120 mesh, and the water content is below 1%.

Example 6

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg of cement, 750kg of construction waste sand, 50kg of fly ash, 5.5kg of accelerator and early strength agent, 0.3kg of air-entraining agent, compound Additive 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 12:1.5:18;

The particle size of the fly ash is above 120 mesh, and the water content is below 1%.

Example 7

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 200kg of cement, 600kg of construction waste sand, 50kg of slag powder, 100kg of fly ash, 50kg of phosphorus slag, and 5kg of accelerator and early strength agent. Air-entraining agent 0.3kg, composite additive 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 12:1.2:18;

The particle size of fly ash is less than 3mm, and the particle size of slag powder and phosphorus slag is not less than 300 mesh.

Example 8

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 200kg of cement, 600kg of construction waste sand, 25kg of slag powder, 75kg of fly ash, 25kg of phosphorus slag, and 5kg of accelerator and early strength agent. Air-entraining agent 0.3kg, composite additive 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 12:1.2:18;

The particle size of fly ash is above 120 mesh, and the water content is below 1%; the particle size of slag powder and phosphorus slag is not less than 300 mesh.

Example 9

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: cement 200kg, construction waste sand 540kg, slag powder 67.5kg, fly ash 112.5kg, phosphorus slag 67.5kg, coagulation accelerator and early strength Agent 5kg, air-entraining agent 0.3kg, composite additive 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 12:1.2:18;

The particle size of fly ash is above 120 mesh, and the water content is below 1%; the particle size of slag powder and phosphorus slag is not less than 300 mesh.

Example 10

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg cement, 500kg construction waste sand, 200kg broken aerated brick waste, 30kg slag powder, 20kg polystyrene particles, coagulation accelerator Early strength agent 5kg, air-entraining agent 0.3kg, compound additive 1kg, waste woven bag broken strip 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 10:1:15;

The particle size of slag powder is not less than 300 mesh, the particle size of waste aerated brick crushed material is less than 2.5mm, the particle size of polyphenylene particles is less than 4mm, the width of waste woven bag broken strips is 3-5mm, and the length is 6mm-8cm.

Example 11

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg cement, 500kg construction waste sand, 150kg broken aerated brick waste, 35kg slag powder, 25kg polystyrene particles, coagulation accelerator Early strength agent 5kg, air-entraining agent 0.3kg, compound additive 1kg, waste woven bag broken strip 0.8kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 10:1:15;

The particle size of slag powder is not less than 300 mesh, the particle size of waste aerated brick crushed material is less than 2.5mm, the particle size of polyphenylene particles is less than 4mm, the width of waste woven bag broken strips is 3-5mm, and the length is 6mm-8cm.

Example 12

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg of cement, 500kg of construction waste sand, 250kg of broken aerated brick waste, 25kg of slag powder, 15kg of polystyrene particles, and coagulation accelerator Early strength agent 5kg, air-entraining agent 0.3kg, compound additive 1kg, waste woven bag broken strip 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 10:1:15;

The particle size of slag powder is not less than 300 mesh, the particle size of waste aerated brick crushed material is less than 2.5mm, the particle size of polyphenylene particles is less than 4mm, the width of waste woven bag broken strips is 3-5mm, and the length is 6mm-8cm.

Example 13

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made by mixing the following raw materials: 250kg of cement, 500kg of construction waste sand, 200kg of broken aerated brick waste, 50kg of slag powder, 50kg of phosphorus slag, and early coagulation Strong agent 6kg, air-entraining agent 0.3kg, compound additive 1kg, waste woven bag broken strip 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 14:1.5:20;

The particle size of the crushed aerated brick waste block is below 2.5mm, the particle size of slag powder and phosphorous slag is not less than 300 mesh, the width of the waste woven bag crushing strip is 3-5mm, and the length is 6mm-8cm.

Example 14

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made of the following raw materials: 250kg of cement, 500kg of construction waste sand, 150kg of broken aerated brick waste, 75kg of slag powder, 75kg of phosphorus slag, and early coagulation Strong agent 6kg, air-entraining agent 0.3kg, compound additive 1kg, waste woven bag broken strip 0.5kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 14:1.5:20;

The particle size of the crushed aerated brick waste block is below 2.5mm, the particle size of slag powder and phosphorous slag is not less than 300 mesh, the width of the waste woven bag crushing strip is 3-5mm, and the length is 6mm-8cm.

Example 15

A cement-based ready-mixed dry-mixed mortar for 3D printing, which is made of the following raw materials: 250kg of cement, 500kg of construction waste sand, 250kg of broken aerated brick waste, 25kg of slag powder, 25kg of phosphorus slag, and early coagulation Strong agent 6kg, air-entraining agent 0.3kg, compound additive 1kg, waste woven bag broken strip 1kg;

Among them, the composite additives include starch mud, water reducing agent, and renewable latex powder, and the weight ratio of starch mud, water reducing agent, and renewable latex powder is 14:1.5:20;

The particle size of the crushed aerated brick waste block is below 2.5mm, the particle size of slag powder and phosphorous slag is not less than 300 mesh, the width of the waste woven bag crushing strip is 3-5mm, and the length is 6mm-8cm.

control group

Commercially available cement mortar, its main components are cement, fine aggregate, lime and active admixtures.

Experimental example 1

The mortar and water prepared according to the ratio of Examples 1-16 were added with water at a ratio of 1:0.37-0.40. After mixing, a 3D printing robot was used to coat 10mm. The properties of the coating layer were investigated. The results are shown in Table 1.

Table 1 performance results

It can be seen from Table 1 that after the cement-based ready-mixed dry-mixed mortar for 3D printing provided by the present invention is coated, the initial setting time is shortened by at least 1 hour, and the curing period is shortened by about 1 week, and there will be no hollowing, turtles, etc. cracking and other problems, the compressive strength of the prepared coated body is also significantly enhanced. In addition, as the fine aggregate in Examples 10-15, waste aerated brick fragments and/or polystyrene particles with thermal insulation properties are selected. In addition to the above-mentioned properties, the coated wall also has good thermal insulation properties. performance. It can be seen that the cement-based ready-mixed dry-mixed mortar provided by the present invention has excellent comprehensive performance.

In addition, when using the cement-based ready-mixed dry-mixed mortar provided by the present invention under high-temperature weather conditions higher than 30°C, it is also necessary to add water-retaining agent cellulose ether to the raw materials in Examples 1-15, and the viscosity of cellulose ether is 20 More than 10,000 units, the added amount of the water-retaining agent accounts for 65%-72% of the weight of the composite additive. After the raw materials are mixed, water is added to mix and coat. The performance of the obtained coated body is consistent with the results of Examples 1-16.

While particular embodiments of the invention have been illustrated and described, it should be appreciated that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims (4)

1. a kind of cement base premixing dry-mixed mortar for 3D printing, it is characterised in that mixed by following raw material, by weight Part meter, cement 200-250 parts, fine aggregate 700-800 parts, promote solidifying early strength agent 5-6 parts, air entraining agent 0.2-0.4 parts, compound additive 0.8-1.5 parts；

Wherein, the composition of the compound additive is：Starch mud, water reducer and renewable latex powder, the starch mud, diminishing Agent, the weight ratio of renewable latex powder are 9-14:1-1.5:15-20；

The fine aggregate is selected from any of following：

The fine aggregate is Machine-made Sand, construction waste sand and flyash with 10:(3-5):The mixing of the mass ratio of (0.5-1.5) Thing；

The fine aggregate is construction waste sand and flyash with (13-15):The mixture of 1 mass ratio；

The fine aggregate is construction waste sand, slag powders, flyash and phosphorus slag with 12：(0.5-1.5)：(1.5-2.5)：(0.5- 1.5) mixture of mass ratio；

The fine aggregate is construction waste sand, aerated bricks useless block broken material, slag powders and granular polystyrene with 100：(30-50)：(5- 7)：The mixture of the mass ratio of (3-5)；

The fine aggregate is construction waste sand, aerated bricks useless block broken material, slag powders and phosphorus slag with 10：(3-5)：(0.5-1.5)： The mixture of the mass ratio of (0.5-1.5).

2. the cement base premixing dry-mixed mortar according to claim 1 for 3D printing, it is characterised in that the slag powders It is not less than 300 mesh with the granularity of the phosphorus slag, the granularity of the flyash is more than 120 mesh, and water content is below 1%；Institute The granularity for stating the useless block crushed material of aerated bricks is below 2.5mm, and the granularity of the granular polystyrene is below 4mm.

3. a kind of cement base premixing dry-mixed mortar for 3D printing, it is characterised in that mixed by following raw material, by weight Part meter, cement 200-250 parts, fine aggregate 700-800 parts, promote solidifying early strength agent 5-6 parts, air entraining agent 0.2-0.4 parts, compound additive 0.8-1.5 parts, waste woven bag breaker bars 0.5-1 parts by weight；

Wherein, the composition of the compound additive is：Starch mud, water reducer and renewable latex powder, the starch mud, diminishing Agent, the weight ratio of renewable latex powder are 9-14:1-1.5:15-20；

The fine aggregate is selected from any of following：

The fine aggregate is Machine-made Sand, construction waste sand and flyash with 10:(3-5):The mixing of the mass ratio of (0.5-1.5) Thing；

The fine aggregate is construction waste sand and flyash with (13-15):The mixture of 1 mass ratio；

The fine aggregate is construction waste sand, slag powders, flyash and phosphorus slag with 12：(0.5-1.5)：(1.5-2.5)：(0.5- 1.5) mixture of mass ratio；

The fine aggregate is construction waste sand, aerated bricks useless block broken material, slag powders and granular polystyrene with 100：(30-50)：(5- 7)：The mixture of the mass ratio of (3-5)；

The fine aggregate is construction waste sand, aerated bricks useless block broken material, slag powders and phosphorus slag with 10：(3-5)：(0.5-1.5)： The mixture of the mass ratio of (0.5-1.5).

4. the cement base premixing dry-mixed mortar according to claim 3 for 3D printing, it is characterised in that the waste and old volume The width for knitting bag breaker bars is 3-5mm, length 6mm-8cm.