A high crack-resistant and wear-resistant cement, its preparation method and application

Abstract

The present invention relates to the field of building materials technology, and more specifically to a highly crack-resistant and wear-resistant cement, its preparation method, and its application. The present invention utilizes sulfoaluminate cement clinker, a highly reactive admixture, a composite early strength agent, a water reducer, and an air-entraining agent as raw materials to successfully prepare a sulphoaluminate cement with high crack resistance and wear resistance. By utilizing the synergistic effects of the various raw material components, the present invention successfully addresses the existing issues of sulphoaluminate cement, such as its poor crack resistance and wear resistance, high preparation costs, and poor compatibility of the various components. This provides new insights into the design and development of sulphoaluminate cement.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to a high-crack-resistant and wear-resistant cement and a preparation method and application thereof. Background Art

[0002] Sulphoaluminate cement is typically made by mixing gypsum, bauxite, and limestone in a certain proportion and calcining at low temperatures. It is a hydraulic cementitious material with excellent properties such as rapid hardening, early strength, low alkalinity, frost resistance, impermeability, and corrosion resistance. The main minerals in its clinker are C2S and C4A3$. Sulphoaluminate cement sets and hardens rapidly. However, during large-scale pouring, the temperature at the center of the cast can rise sharply, easily leading to excessive concentration of hydration heat, which in turn can cause cracks due to a large temperature difference between the inside and outside of the cast. Sulphoaluminate cement also has relatively poor wear resistance. When used in areas subject to wear, it may be necessary to add additional aggregate or take other reinforcement measures to improve its wear resistance.

[0003] To improve the crack resistance and wear resistance of sulphoaluminate cement, existing technologies often add fiber materials or additives (retarders, expansive agents, or anti-wear agents) to increase its toughness and strength. However, the selection of fiber materials and the compatibility of additives have become new challenges that limit the development of sulphoaluminate cement, and they can easily increase the production cost of sulphoaluminate cement, reducing its economic value.

[0004] Based on this, the research and development of a sulphoaluminate cement with excellent crack resistance and wear resistance is of great significance to the development of building cementitious materials. Summary of the Invention

[0005] To address the problems of existing sulphoaluminate cement, which suffers from poor crack and wear resistance, high production costs, and poor compatibility of its components, the present invention provides a highly crack-resistant and wear-resistant cement, its preparation method, and its application. Using sulphoaluminate cement clinker, highly reactive admixtures, a composite early strength agent, a water reducer, and an air-entraining agent as raw materials, the present invention successfully prepares a sulphoaluminate cement with high crack and wear resistance. This effectively addresses the aforementioned issues with existing sulphoaluminate cement and provides new insights into its design and development.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A first aspect of the present invention provides a highly crack-resistant and wear-resistant cement comprising the following raw material components by mass: 80-120 parts of sulphoaluminate cement clinker, 40-60 parts of a highly reactive admixture, 10-15 parts of a composite early strength agent, 5-10 parts of a water reducer, and 1-3 parts of an air-entraining agent;

[0008] Wherein, the composite early strength agent comprises triethanolamine, calcium bromide and anhydrous sodium sulfate;

[0009] The high-activity admixture is a mixture of high-titanium slag, waste ceramic powder and fly ash.

[0010] Compared with the prior art, the present invention adds highly active admixtures to the cement material, utilizing a compound of high-titanium slag, waste ceramic powder, and fly ash to significantly improve the density of sulphoaluminate cement. The high-titanium slag acts as a micro-aggregate filling agent, filling the tiny pores in the cement and enhancing the density of the cement. Furthermore, the high-titanium slag can act as a microcrystalline nucleus in the later stages of cement hydration, accelerating the nucleation and growth of sulphoaluminate cement clinker minerals, thereby improving the mechanical strength and wear resistance of the cement material. The active silica and alumina in the waste ceramic powder easily undergo a secondary hydration reaction with calcium hydroxide, and the resulting CSH gel further improves the density of the cement. Furthermore, the gel can wrap the micro-aggregate of the high-titanium slag, giving it a more excellent filling effect. The addition of fly ash can effectively alleviate the development of cement cracks, increase the peak value of the hydration heat release rate of the cement material, and form an induced activation effect with the high-titanium slag. The two complement each other, inducing each other to increase the hydration rate and promoting the formation of their own hydration products, thereby improving the crack resistance and mechanical properties of the cement.

[0011] The addition of a composite early strength agent not only accelerates the hydration of the mineral components in the sulfoaluminate cement clinker, but also utilizes the emulsifying effect of triethanolamine to decompose the surface colloidal film produced by cement hydration, strengthening the density of the cement's solid phase volume structure, thereby achieving the goal of simultaneously ensuring both early and late strength of the cement. Calcium bromide can promote the early hydration reaction of cement by increasing the calcium ion concentration, thereby improving early strength by increasing the early density of the cement microstructure. The addition of anhydrous sodium sulfate can increase the ion concentration in the cement liquid phase, exerting a compression effect that expands the double electron layer, promoting the decomposition of tricalcium silicate in the clinker and accelerating the hydration reaction. This reaction with calcium ions promotes the formation of ettringite and monosulfur-type calcium sulfoaluminate hydrate, thereby achieving early strength and rapid hardening while avoiding cracking.

[0012] In summary, the high crack-resistant and wear-resistant cement provided by the present invention has good mechanical properties, excellent wear resistance and crack resistance. By utilizing the synergistic effect of various raw material components, it successfully solves the problems of poor crack resistance and wear resistance of sulphoaluminate cement in the prior art, high preparation cost, and poor compatibility of various components, providing new ideas for the design and development of sulphoaluminate cement.

[0013] Preferably, the mass ratio of triethanolamine, calcium bromide and anhydrous sodium sulfate is 1:50:50-2:50:50.

[0014] Preferably, the specific surface area of the high titanium slag is 300m2 / kg-400m 2 / kg.

[0015] Preferably, the high-activity admixture includes the following raw material components by mass: 30%-40% high-titanium slag, 20%-30% waste ceramic powder and the balance fly ash.

[0016] The high-titanium slag is a granular or block-shaped waste slag obtained by quenching or naturally cooling the slag discharged during the process of smelting pig iron using vanadium-titanium ore as raw materials.

[0017] The high-titanium slag includes the following chemical components in percentage by mass: 30%-35% CaO, 20-25% SiO2, 10%-15% TiO2 and 20-35% Al2O3.

[0018] Further preferably, the preparation method of the high-activity admixture comprises the following steps:

[0019] S1. Weigh the raw materials according to the designed ratio and ball mill them to obtain a mixture;

[0020] S2. The mixed material is heat-treated at 80-120° C. and then ball-milled for a second time to obtain a high-activity admixture.

[0021] More preferably, in S1, the rotation speed of the ball milling treatment is 300 rpm-500 rpm, and the time of the ball milling treatment is 40 min-60 min.

[0022] More preferably, in S2, the holding time of the heat treatment is 2h-5h.

[0023] More preferably, in S2, the rotation speed of the secondary ball milling is 800 rpm-1200 rpm, and the time of the secondary ball milling is 25 min-35 min.

[0024] Preferably, the mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 40%-50%; C4A3$: 10%-25%; C4AF: 5%-15%; CaSO4: 10%-15% and the remainder of other components.

[0025] Further preferably, the other components include any one or more of SiO2, f-CaO, Al2O3 or Fe2O3.

[0026] Preferably, the particle size of the high-activity admixture is 100 μm-200 μm.

[0027] Preferably, the water reducer is any one of a polycarboxylic acid-type water reducer or a naphthalene-based high-efficiency water reducer.

[0028] Preferably, the air entraining agent is alkylbenzene sulfonate.

[0029] The second aspect of the present invention provides a method for preparing the highly crack-resistant and wear-resistant cement, comprising the following steps:

[0030] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0031] Step 2: uniformly mix the early strength agent, water reducing agent and air entraining agent, and uniformly mix with the high-activity admixture to obtain a first cement mixture;

[0032] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0033] The third aspect of the present invention provides the use of the high crack-resistant and wear-resistant cement or the high crack-resistant and wear-resistant cement prepared by the preparation method of the high crack-resistant and wear-resistant cement in the field of construction.

[0034] In summary, the present invention successfully prepared a sulphoaluminate cement with high crack resistance and wear resistance using sulphoaluminate cement clinker, high-activity admixtures, composite early strength agent, water reducer, and air-entraining agent as raw materials. By utilizing the synergistic effect of each component raw material, the cement material provided by the present invention has been tested to achieve LV level crack resistance and a 28-day wear rate of only 1.2 kg / m 2 The technical solution of the present invention successfully solves the problems of poor crack resistance and wear resistance of sulphoaluminate cement, high preparation cost and poor compatibility of various components, and provides a new idea for the design and development of sulphoaluminate cement. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] The high titanium slag used in the following examples and comparative examples includes the following chemical components by mass percentage: 32.8% CaO, 24.6% SiO2, 11.7% TiO2 and 30.9% Al2O3; the specific surface area of the high titanium slag is 350m 2 / kg.

[0037] Example 1

[0038] This embodiment provides a highly crack-resistant and wear-resistant cement, which specifically includes the following contents:

[0039] The high crack-resistant and wear-resistant cement comprises the following raw material components: 100 parts of sulphoaluminate cement clinker, 50 parts of high-activity admixture, 12 parts of composite early strength agent, 8 parts of polycarboxylic acid type water reducer and 2 parts of alkylbenzene sulfonate;

[0040] The composite early strength agent is triethanolamine, calcium bromide and anhydrous sodium sulfate in a mass ratio of 1.5:50:50;

[0041] The high-activity admixture comprises the following raw material components: 35% high-titanium slag, 25% waste ceramic powder and 40% fly ash;

[0042] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0043] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0044] Step 2: uniformly mixing the composite early strength agent, water reducing agent and air entraining agent, and uniformly mixing with the high-activity admixture to obtain a first cement mixture;

[0045] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0046] The preparation method of the high-activity admixture comprises the following steps:

[0047] S1. Weigh each raw material component according to the designed ratio, and ball mill it at a speed of 400 rpm for 50 min to obtain a mixture;

[0048] S2. The mixture is heat-treated at 100° C. for 4 hours, and then ball-milled for a second time at a rotation speed of 1000 rpm for 30 minutes to obtain a high-activity admixture with a particle size of 150 μm.

[0049] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 47.2%; C4A3$: 22.6%; C4AF: 12.3%; CaSO4: 11.7%, 3.2% SiO2 and 3% f-CaO.

[0050] Example 2

[0051] This embodiment provides a highly crack-resistant and wear-resistant cement, which specifically includes the following contents:

[0052] The high crack-resistant and wear-resistant cement comprises the following raw material components: 120 parts of sulphoaluminate cement clinker, 42 parts of high-activity admixture, 10 parts of composite early strength agent, 10 parts of polycarboxylic acid type water reducer and 3 parts of alkylbenzene sulfonate;

[0053] The composite early strength agent is triethanolamine, calcium bromide and anhydrous sodium sulfate in a mass ratio of 2:50:50;

[0054] The high-activity admixture comprises the following raw material components by weight: 40% high-titanium slag, 20% waste ceramic powder and 40% fly ash;

[0055] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0056] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0057] Step 2: uniformly mixing the composite early strength agent, water reducing agent and air entraining agent, and uniformly mixing with the high-activity admixture to obtain a first cement mixture;

[0058] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0059] The preparation method of the high-activity admixture comprises the following steps:

[0060] S1. Weigh each raw material component according to the designed ratio, and ball mill it at a speed of 500 rpm for 40 min to obtain a mixture;

[0061] S2. The mixture is heat-treated at 120° C. for 5 hours, and then ball-milled for a second time at a rotation speed of 1200 rpm for 25 minutes to obtain a high-activity admixture with a particle size of 100 μm.

[0062] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 41.9%; C4A3$: 24.8%; C4AF: 10.1%; CaSO4: 14.7%, 5.3% SiO2 and 3.2% f-CaO.

[0063] Example 3

[0064] This embodiment provides a highly crack-resistant and wear-resistant cement, which specifically includes the following contents:

[0065] The high crack-resistant and wear-resistant cement comprises the following raw material components: 80 parts of sulphoaluminate cement clinker, 60 parts of high-activity admixture, 15 parts of composite early strength agent, 10 parts of polycarboxylic acid type water reducer and 1 part of alkylbenzene sulfonate;

[0066] The composite early strength agent is triethanolamine, calcium bromide and anhydrous sodium sulfate in a mass ratio of 1:50:50;

[0067] The high-activity admixture comprises the following raw material components by weight: 30% high-titanium slag, 30% waste ceramic powder and 40% fly ash;

[0068] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0069] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0070] Step 2: uniformly mixing the composite early strength agent, water reducing agent and air entraining agent, and uniformly mixing with the high-activity admixture to obtain a first cement mixture;

[0071] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0072] The preparation method of the high-activity admixture comprises the following steps:

[0073] S1. Weigh each raw material component according to the designed ratio, and ball mill it at a speed of 450 rpm for 60 min to obtain a mixture;

[0074] S2. The mixture is heat-treated at 100° C. for 4 hours, and then ball-milled for a second time at a rotation speed of 1000 rpm for 30 minutes to obtain a high-activity admixture with a particle size of 120 μm.

[0075] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 42.3%; C4A3$: 22.6%; C4AF: 12.7%; CaSO4: 14.3%, 3.2% f-CaO and 4.9% Al2O3.

[0076] Example 4

[0077] This embodiment provides a highly crack-resistant and wear-resistant cement, which specifically includes the following contents:

[0078] The high crack-resistant and wear-resistant cement comprises the following raw material components: 100 parts of sulphoaluminate cement clinker, 50 parts of high-activity admixture, 12 parts of composite early strength agent, 8 parts of polycarboxylic acid type water reducer and 2 parts of alkylbenzene sulfonate;

[0079] The composite early strength agent is triethanolamine, calcium bromide and anhydrous sodium sulfate in a mass ratio of 1.5:50:50;

[0080] The high-activity admixture comprises the following raw material components: 35% high-titanium slag, 25% waste ceramic powder and 40% fly ash;

[0081] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0082] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0083] Step 2: uniformly mixing the composite early strength agent, water reducing agent and air entraining agent, and uniformly mixing with the high-activity admixture to obtain a first cement mixture;

[0084] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0085] The preparation method of the high-activity admixture comprises the following steps:

[0086] S1. Weigh each raw material component according to the designed ratio, and ball mill it at a speed of 400 rpm for 50 min to obtain a mixture;

[0087] S2. The mixture is heat-treated at 100° C. for 4 hours, and then ball-milled for a second time at a rotation speed of 1000 rpm for 30 minutes to obtain a high-activity admixture with a particle size of 150 μm.

[0088] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 47.2%; C4A3$: 23.6%; C4AF: 9.3%; CaSO4: 12.7%, 3.2% SiO2 and 4% f-CaO.

[0089] Example 5

[0090] This embodiment provides a highly crack-resistant and wear-resistant cement, which differs from Example 1 in that the alkylbenzene sulfonate is replaced with an equal amount of rosin resin, specifically including the following contents:

[0091] The high crack-resistant and wear-resistant cement comprises the following raw material components: 100 parts of sulphoaluminate cement clinker, 50 parts of high-activity admixture, 12 parts of composite early strength agent, 8 parts of polycarboxylic acid type water reducer and 2 parts of rosin resin;

[0092] The composite early strength agent is triethanolamine, calcium bromide and anhydrous sodium sulfate in a mass ratio of 1.5:50:50;

[0093] The high-activity admixture comprises the following raw material components: 35% high-titanium slag, 25% waste ceramic powder and 40% fly ash;

[0094] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0095] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0096] Step 2: uniformly mixing the composite early strength agent, polycarboxylic acid water reducer and rosin resin, and uniformly mixing with the high-activity admixture to obtain a first cement mixture;

[0097] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0098] The preparation method of the high-activity admixture comprises the following steps:

[0099] S1. Weigh each raw material component according to the designed ratio, and ball mill it at a speed of 400 rpm for 50 min to obtain a mixture;

[0100] S2. The mixture is heat-treated at 100° C. for 4 hours, and then ball-milled for a second time at a rotation speed of 1000 rpm for 30 minutes to obtain a high-activity admixture with a particle size of 150 μm.

[0101] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 47.2%; C4A3$: 22.6%; C4AF: 12.3%; CaSO4: 11.7%, 3.2% SiO2 and 3% f-CaO.

[0102] Comparative Example 1

[0103] This comparative example provides a high crack-resistant and wear-resistant cement, which differs from Example 1 in that the composite early strength agent is replaced with an equal amount of calcium formate, specifically including the following contents:

[0104] The high crack-resistant and wear-resistant cement comprises the following raw material components: 100 parts of sulphoaluminate cement clinker, 50 parts of high-activity admixture, 12 parts of calcium formate, 8 parts of polycarboxylate water reducer and 2 parts of alkylbenzene sulfonate;

[0105] The high-activity admixture comprises the following raw material components: 35% high-titanium slag, 25% waste ceramic powder and 40% fly ash;

[0106] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0107] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0108] Step 2: uniformly mixing the calcium formate, water reducer and air entraining agent, and uniformly mixing with the high-activity admixture to obtain a first cement mixture;

[0109] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0110] The preparation method of the high-activity admixture comprises the following steps:

[0111] S1. Weigh each raw material component according to the designed ratio, and ball mill it at a speed of 400 rpm for 50 min to obtain a mixture;

[0112] S2. The mixture is heat-treated at 100° C. for 4 hours, and then ball-milled for a second time at a rotation speed of 1000 rpm for 30 minutes to obtain a high-activity admixture with a particle size of 150 μm.

[0113] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 47.2%; C4A3$: 22.6%; C4AF: 12.3%; CaSO4: 11.7%, 3.2% SiO2 and 3% f-CaO.

[0114] Comparative Example 2

[0115] This comparative example provides a highly crack-resistant and wear-resistant cement, which differs from Example 1 in that the highly active admixture is replaced with an equal amount of high-titanium slag, specifically including the following contents:

[0116] The high crack-resistant and wear-resistant cement comprises the following raw material components: 100 parts of sulphoaluminate cement clinker, 50 parts of high-titanium slag, 12 parts of composite early strength agent, 8 parts of polycarboxylic acid type water reducer and 2 parts of alkylbenzene sulfonate;

[0117] The composite early strength agent is triethanolamine, calcium bromide and anhydrous sodium sulfate in a mass ratio of 1.5:50:50;

[0118] The preparation method of the highly crack-resistant and wear-resistant cement comprises the following steps:

[0119] Step 1: Weigh the raw materials of each component according to the designed ratio and set aside;

[0120] Step 2: uniformly mixing the calcium formate, water reducer and air entraining agent, and uniformly mixing with high-titanium slag to obtain a first cement mixture;

[0121] Step 3: Add sulphoaluminate cement clinker to the first cement mixture and perform homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

[0122] The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 47.2%; C4A3$: 22.6%; C4AF: 12.3%; CaSO4: 11.7%, 3.2% SiO2 and 3% f-CaO.

[0123] In order to further demonstrate the technical effect of the present invention, the present invention conducted relevant performance tests on the cement materials obtained in Examples 1-5 and Comparative Examples 1-2, specifically including the following contents: Crack resistance (crack resistance grade): Reference standard JGJ / T193-2009, grade classification LI (total crack area per unit area ≥ 1000mm 2 / m 2 )、L-II(1000mm 2 / m 2 >Total cracking area per unit area ≥700mm 2 / m 2 )、L-III(700mm 2 / m 2 >Total cracking area per unit area ≥400mm 2 / m 2 )、L-IV(400mm 2 / m 2 >Total cracking area per unit area ≥100mm 2 / m 2 ), LV (total cracking area per unit area <100mm 2 / m 2 ), the higher the grade, the better the crack resistance.

[0124] Wear resistance test The cement materials obtained in Examples 1-5 and Comparative Examples 1-2 were tested for 28-day wear resistance in accordance with the national standard JC / T42-2005 “Test method for wear resistance of cement mortar”.

[0125] Table 1 Performance test results of cement materials obtained from Examples 1-5 and Comparative Examples 1-2

[0126]

[0127] It can be seen from Table 1 that the cement materials obtained in the embodiments of the present invention have excellent crack resistance and wear resistance. In particular, the cement material obtained in Example 1 has crack resistance that can reach LV level, and the wear loss at 28 days is only 1.2 kg / m 2 .

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly crack-resistant and wear-resistant cement, characterized by: The raw material components include: 80-120 parts of sulphoaluminate cement clinker, 40-60 parts of high-activity admixture, 10-15 parts of composite early strength agent, 5-10 parts of water reducing agent and 1-3 parts of air entraining agent; Wherein, the composite early strength agent comprises triethanolamine, calcium bromide and anhydrous sodium sulfate; The high-activity admixture is a mixture of high-titanium slag, waste ceramic powder and fly ash; The mass ratio of triethanolamine, calcium bromide and anhydrous sodium sulfate is 1:50:50-2:50:50; The specific surface area of the high titanium slag is 300m 2 / kg-400m 2 / kg; The high-activity admixture includes the following raw material components by mass: 30%-40% high-titanium slag, 20%-30% waste ceramic powder and the balance fly ash.

2. The highly crack-resistant and wear-resistant cement according to claim 1, characterized in that: The preparation method of the highly active admixture comprises the following steps: S1. Weigh the raw materials according to the designed ratio and ball mill them to obtain a mixture; S2. The mixed material is heat-treated at 80° C.-120° C. and ball-milled for a second time to obtain a high-activity admixture.

3. The highly crack-resistant and wear-resistant cement according to claim 2, characterized in that: In S1, the rotation speed of the ball milling treatment is 300 rpm-500 rpm, and the time of the ball milling treatment is 40 min-60 min; and / or In S2, the holding time of the heat treatment is 2h-5h; and / or In S2, the rotation speed of the secondary ball milling is 800 rpm-1200 rpm, and the time of the secondary ball milling is 25 min-35 min.

4. The highly crack-resistant and wear-resistant cement according to claim 1, characterized in that: The mineral composition of the sulphoaluminate cement clinker includes the following components in percentage by mass: C2S: 40%-50%; C4A3$: 10%-25%; C4AF: 5%-15%; CaSO4: 10%-15% and the balance of other components.

5. The highly crack-resistant and wear-resistant cement according to claim 1, characterized in that: The particle size of the highly active admixture is 100 μm-200 μm; and / or The water reducer is any one of a polycarboxylic acid water reducer or a naphthalene-based high-efficiency water reducer; and / or The air entraining agent is alkylbenzene sulfonate.

6. The method for preparing the highly crack-resistant and wear-resistant cement according to any one of claims 1 to 5, wherein: The steps include: Step 1: weighing the raw materials of each component according to the designed ratio, and uniformly mixing the composite early strength agent, water reducing agent, air entraining agent and high-activity admixture to obtain a first cement mixture; Step 2: adding the sulphoaluminate cement clinker into the first cement mixture and performing homogenization treatment to obtain highly crack-resistant and wear-resistant cement.

7. Use of the high crack-resistant and wear-resistant cement according to any one of claims 1 to 5 or the high crack-resistant and wear-resistant cement prepared by the preparation method of the high crack-resistant and wear-resistant cement according to claim 6 in the field of developing new building materials.

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