High-early-strength low-shrinkage composite portland cement and preparation method thereof

Abstract

This invention discloses a high-early-strength, low-shrinkage composite silicate cement and its preparation method, comprising: low-shrinkage silicate cement clinker, early-strength component, and gypsum component; the low-shrinkage silicate cement clinker is prepared from calcareous raw materials, siliceous-aluminous raw materials, ferrous raw materials, a first activator, and a mineralizer; its mineral composition includes: C3S 30-50 parts, C2S 20-40 parts, C3A 0.5-5 parts, and C4AF 10-25 parts; its particle size distribution characteristics are D10≥5μm, D90≤45μm, uniformity index of 1.2-1.6, and characteristic particle size of 25-30μm; the early-strength component is prepared from F-type fly ash or C-type fly ash, limestone, magnesium oxide, and a second activator; its mineral composition includes: C 20 A 13 M3S 350-65 parts, C2S 35-50 parts. The cement prepared by this invention not only has high early strength, but also has a small drying shrinkage rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Portland cement, in particular to a high-early-strength and low-shrinkage composite Portland cement and a preparation method thereof, which is mainly used in the field of railway engineering construction and can also be used in the fields of hydraulic engineering and highway engineering. BACKGROUND

[0002] In actual engineering applications, the self-shrinkage and drying shrinkage of cast-in-place concrete of railways under constraint conditions after hardening can easily lead to cracking of the concrete, and once the cracking occurs, it will seriously affect the service life and durability of the concrete.

[0003] Portland cement is the main cementitious material for preparing cast-in-place concrete of railways, and its quality is the key to determining the quality of the concrete.

[0004] CN 1356281A discloses a low-heat Portland cement and its preparation and application, which effectively reduces the hydration heat release and drying shrinkage of the cement and the concrete prepared therefrom by controlling the content of dicalcium silicate to be greater than 40%, and plays a positive role in improving the cracking of the concrete, but has the significant defect of low early strength.

[0005] CN 110615627A aims at the problem of low early strength of low-heat Portland cement and its unsuitability for railway engineering, and proposes an early-strength low-heat cement for railway engineering and a preparation method thereof by appropriately reducing the content of dicalcium silicate to a minimum of 35%, which improves the early strength of low-heat Portland cement to a limited extent. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a high-early-strength and low-shrinkage composite Portland cement and a preparation method thereof.

[0007] The present application discloses a high-early-strength and low-shrinkage composite Portland cement, which comprises: low-shrinkage Portland cement clinker, early-strength component and gypsum component.

[0008] The low-shrinkage Portland cement clinker is prepared from calcareous raw material, siliceous and aluminous raw material, ferruginous raw material, first activator and mineralizer; the mineral composition of the low-shrinkage Portland cement clinker comprises, in terms of mass fraction: C3S (tricalcium silicate) 30-50 parts, C2S (dicalcium silicate) 20-40 parts, C3A (tricalcium aluminate) 0.5-5 parts, and C4AF (tetracalcium aluminoferrite) 10-25 parts; the particle size distribution characteristics of the low-shrinkage Portland cement clinker are D10≥5 μm, D90≤45 μm, and the uniformity index n is 1.2-1.6, and the characteristic particle size is 25-30 μm. ​

[0009] The early strength component is prepared from F-class fly ash or C-class fly ash, limestone, magnesium oxide and a second activator; the mineral composition of the early strength component includes, in mass fraction: C 20 A 13 M3S3 (Q phase) 50-65 parts, C2S (dicalcium silicate) 35-50 parts.

[0010] As a further improvement of the present application, the high early strength and low shrinkage composite Portland cement includes, in mass percentage: low shrinkage Portland cement clinker 50-80 parts, early strength component 15-30 parts, gypsum component 5-15 parts.

[0011] As a further improvement of the present application, the raw material composition of the low shrinkage Portland cement clinker includes, in mass percentage: calcareous raw material 45-70 parts, silico-aluminous raw material 15-35 parts, ferruginous raw material 8-15 parts, mineralizer 0.05-1.5 parts, first activator 0.8-2.5 parts; the raw material composition of the early strength component includes, in mass percentage: F-class fly ash or C-class fly ash 30-40 parts, limestone 55-70 parts, magnesium oxide 0.5-2 parts and second activator 0.1-0.8 parts.

[0012] As a further improvement of the present application, the gypsum component is at least one of dihydrate gypsum, alpha hemihydrate gypsum, beta hemihydrate gypsum, alpha III type anhydrite and beta III type anhydrite.

[0013] As a further improvement of the present application, the calcareous raw material includes one or more of limestone, marble, marl and chalk; the silico-aluminous raw material includes one or more of clay, shale and mudstone; the ferruginous raw material includes one of iron tailings, sulfuric acid slag and copper slag; the first activator includes one of chalcopyrite, chalcocite and blue copper ore; the mineralizer includes one of gypsum, fluorite, slag and phosphorous slag.

[0014] As a further improvement of the present application, the second activator includes one of sphalerite, chalcopyrite and pyrolusite.

[0015] As a further improvement of the present application, the firing temperature of the low shrinkage Portland cement clinker is 1250-1350℃, and the firing time is 2-4 hours; the firing temperature of the early strength component is 1200-1300℃, and the firing time is 2-4 hours.

[0016] The present application also discloses a preparation method of the high early strength and low shrinkage composite Portland cement.

[0017] The calcareous raw material, the siliceous and aluminous raw material, the ferruginous raw material, the mineralizer and the first activator are collectively ground to obtain cement raw meal; the cement raw meal is calcined at a temperature of 1250-1350 DEG C for 2-4 hours to obtain cement clinker, and the low-shrinkage Portland cement clinker meeting the particle size requirement is obtained by controlling the rotation speed of the ball mill and the efficiency of the powder separator;

[0018] The F-class fly ash or C-class fly ash, the limestone, the magnesium oxide and the second activator are collectively ground to obtain ground material; the ground material is calcined at a temperature of 1200-1300 DEG C for 2-4 hours, and then ground to 200 mesh or above after being cooled to room temperature to obtain early-strength component;

[0019] The gypsum component is mixed with the prepared low-shrinkage Portland cement clinker and the early-strength component to obtain high-early-strength and low-shrinkage composite Portland cement.

[0020] As a further improvement of the present application, the mixing mode of the low-shrinkage Portland cement clinker, the early-strength component and the gypsum component is high-speed mixing, the mixing speed is 1000-2000 rad / min, and the mixing time is 20-60 s.

[0021] As a further improvement of the present application, the performance of the prepared high-early-strength and low-shrinkage composite Portland cement is as follows: 1-day compressive strength ≥ 15 MPa, 3-day compressive strength ≥ 30 MPa, 28-day compressive strength ≥ 45 MPa, and 28-day drying shrinkage rate ≤ 0.04%.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] (1) The raw materials used for the sintering of the low-shrinkage Portland cement clinker are widely available, and the production cost is low, which is economical and environmentally friendly, and the sintering temperature is low;

[0024] (2) The raw materials of the early-strength component are mainly fly ash and limestone, which are cheap and widely available;

[0025] (3) In the clinker batching process, copper-containing minerals are added to introduce copper ions to directionally activate the iron phase, thereby reducing the melting temperature of the iron phase, the generation temperature of tricalcium silicate and dicalcium silicate, and improving the hydration activity of the iron phase and dicalcium silicate;

[0026] (4) The content of clinker particles less than 5 μm in the low-shrinkage Portland cement clinker is less than 10%, and the drying shrinkage performance and crack resistance of the clinker are good, and at the same time, the content of clinker particles less than 45 μm in the clinker is greater than 90%, and the clinker has appropriate early strength and good later strength;

[0027] (5) The early-strength component uses ion doping technology to further improve the hydration activity of the early-strength component;

[0028] (6) The addition of Q phase component and gypsum component enables the early-strength low-shrinkage Portland cement of the present application to produce ettringite during early hydration, which compensates for the early shrinkage of the cement and reduces the cracking probability of the cement-based material. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The flow chart of the preparation method of the high-early-strength low-shrinkage composite Portland cement disclosed for an embodiment of the present application. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] The present application will be described in further detail below in connection with the drawings:

[0032] Embodiment 1

[0033] A high-early-strength low-shrinkage composite Portland cement, in mass fraction (total 100 parts), is composed of low-shrinkage Portland cement clinker 68 parts, early-strength component 20 parts, and gypsum component 12 parts; wherein the low-shrinkage Portland cement clinker is made by uniformly mixing limestone 58 parts, clay 31 parts, iron tailings 9 parts, chalcopyrite 0.9 part, and gypsum 1.1 part, and calcining at 1300°C for 2.5 hours, and has a mineral composition of C3S (tricalcium silicate): 43.6 parts, C2S (dicalcium silicate): 34.8 parts, C3A (tricalcium aluminate): 2.1 parts, C4AF (tetracalcium aluminoferrite): 19.5 parts, and a particle size distribution characteristic of D10 = 5.5 μm, D90 = 42.5 μm, and uniformity index n = 1.3, with a characteristic particle size of 28.50 μm; wherein the early-strength component is made by uniformly mixing F-class fly ash 38 parts, limestone 60 parts, magnesium oxide 1.44 parts, and sphalerite 0.56 part, and calcining at 1250°C for 3 hours, and has a mineral composition of C3S (tricalcium silicate): 62 parts, C2S (dicalcium silicate): 38 parts, and a particle size greater than 200 mesh. A high-early-strength low-shrinkage composite Portland cement, in mass fraction (total 100 parts), is composed of low-shrinkage Portland cement clinker 68 parts, early-strength component 20 parts, and gypsum component 12 parts; wherein the low-shrinkage Portland cement clinker is made by uniformly mixing limestone 58 parts, clay 31 parts, iron tailings 9 parts, chalcopyrite 0.9 part, and gypsum 1.1 part, and calcining at 1300°C for 2.5 hours, and has a mineral composition of C3S (tricalcium silicate): 43.6 parts, C2S (dicalcium silicate): 34.8 parts, C3A (tricalcium aluminate): 2.1 parts, C4AF (tetracalcium aluminoferrite): 19.5 parts, and a particle size distribution characteristic of D10 = 5.5 μm, D90 = 42.5 μm, and uniformity index n = 1.3, with a characteristic particle size of 28.50 μm; wherein the early-strength component is made by uniformly mixing F-class fly ash 38 parts, limestone 60 parts, magnesium oxide 1.44 parts, and sphalerite 0.56 part, and calcining at 1250°C for 3 hours, and has a mineral composition of C3S (tricalcium silicate): 62 parts, C2S (dicalcium silicate): 38 parts, and a particle size greater than 200 mesh. 20 A 13 M3S3 (Q phase): 62 parts, C2S (dicalcium silicate): 38 parts, and a particle size greater than 200 mesh.

[0034] The low-shrinkage Portland cement clinker, early-strength component and dihydrate gypsum are mixed at a mixing speed of 1800 rad / min for 35 s to obtain the high-early-strength low-shrinkage composite Portland cement. The strength of the obtained high-early-strength low-shrinkage composite Portland cement is tested according to the standard GB / T 17671-1999, and the dry shrinkage is tested according to the standard JC / T 603-2004. The test results are shown in Table 1.

[0035] Example 2

[0036] A high-early-strength low-shrinkage composite Portland cement, in terms of mass fraction (total 100 parts), is composed of 72 parts of low-shrinkage Portland cement clinker, 16 parts of early-strength component and 12 parts of gypsum component. The low-shrinkage Portland cement clinker is prepared by uniformly mixing 67 parts of limestone, 23 parts of shale, 8 parts of iron tailings, 1.2 parts of blue copper ore and 0.8 parts of fluorite, and calcining at 1280°C for 3.8 hours, and has a mineral composition of C3S (tricalcium silicate): 48.8 parts, C2S (dicalcium silicate): 30.4 parts, C3A (tricalcium aluminate): 3.2 parts, C4AF (tetracalcium aluminoferrite): 17.6 parts, a particle size distribution characteristic of D10 = 5.2 μm, D90 = 43.3 μm, a uniformity index n of 1.28, and a characteristic particle size of 26.15 μm. The early-strength component is prepared by uniformly mixing 32 parts of F-class fly ash, 66 parts of limestone, 1.56 parts of magnesium oxide and 0.44 parts of bronzite, and calcining at 1250°C for 3.2 hours, and has a mineral composition of C M3S3 (Q phase): 54 parts, C2S (dicalcium silicate): 46 parts, and a particle size greater than 200 mesh. 20 A 13 M3S3 (Q phase): 54 parts, C2S (dicalcium silicate): 46 parts, and a particle size greater than 200 mesh.

[0037] The low-shrinkage Portland cement clinker, early-strength component and dihydrate gypsum are mixed at a mixing speed of 1800 rad / min for 35 s to obtain the high-early-strength low-shrinkage composite Portland cement. The strength of the obtained high-early-strength low-shrinkage composite Portland cement is tested according to the standard GB / T 17671-1999, and the dry shrinkage is tested according to the standard JC / T 603-2004. The test results are shown in Table 1.

[0038] Example 3

[0039] A high early-strength and low-shrinkage composite Portland cement, in terms of mass fractions (totaling 100 parts), is composed of low-shrinkage Portland cement clinker 65 parts, early-strength component 22 parts, and gypsum component 13 parts; wherein the low-shrinkage Portland cement clinker is made of limestone 61.1 parts, mudstone 26 parts, iron tailings 10 parts, chalcocite 2 parts, and phosphorus slag 0.9 parts, which are uniformly mixed and calcined at 1320℃ for 2 hours to form, and the mineral composition thereof is C3S (tricalcium silicate): 38.6 parts, C2S (dicalcium silicate): 39.3 parts, C3A (tricalcium aluminate): 3.5 parts, C4AF (tetracalcium aluminoferrite): 18.6 parts, the particle size distribution characteristics are D10 = 6.2 μm, D90 = 40.7 μm, the uniformity index n is 1.45, and the characteristic particle size is 27.88 μm; wherein the early-strength component is made of F-class fly ash 35 parts, limestone 63 parts, magnesium oxide 1.28 parts, and soft manganite 0.72 parts, which are uniformly mixed and calcined at 1280℃ for 2.7 hours to form, and the mineral composition thereof is C A 20 A 13 M3S3 (Q phase): 58 parts, C2S (dicalcium silicate): 42 parts, and particle size greater than 200 mesh.

[0040] The low-shrinkage Portland cement clinker, the early-strength component, and the dihydrate gypsum are mixed at a mixing speed of 2000 rad / min for 25 s to obtain the high early-strength and low-shrinkage composite Portland cement. The strength of the obtained high early-strength and low-shrinkage composite Portland cement is tested according to the standard GB / T 17671-1999, and the dry shrinkage is tested according to the standard JC / T 603-2004, and the test results are shown in Table 1.

[0041] Comparative Example 1

[0042] A composite Portland cement, in terms of mass fractions (totaling 100 parts), is composed of Portland cement clinker 45 parts, early-strength component 35 parts, and gypsum component 20 parts; wherein the Portland cement clinker is made of limestone 58 parts, clay 31 parts, iron tailings 9 parts, chalcopyrite 0.9 parts, and gypsum 1.1 parts, which are uniformly mixed and calcined at 1300℃ for 2.5 hours to form, and the mineral composition thereof is C3S (tricalcium silicate): 43.6 parts, C2S (dicalcium silicate): 34.8 parts, C3A (tricalcium aluminate): 2.1 parts, C4AF (tetracalcium aluminoferrite): 19.5 parts, the particle size distribution characteristics are D10 = 5.5 μm, D90 = 42.5 μm, the uniformity index n is 1.3, and the characteristic particle size is 28.50 μm; wherein the early-strength component is made of F-class fly ash 38 parts, limestone 60 parts, magnesium oxide 1.44 parts, and sphalerite 0.56 parts, which are uniformly mixed and calcined at 1250℃ for 3 hours to form, and the mineral composition thereof is C A 20 A 13M3S3(Q phase): 62 parts, C2S (dicalcium silicate): 38 parts, particle size greater than 200 mesh.

[0043] The portland cement clinker, early strength component and dihydrate gypsum are mixed at a mixing speed of 1750 rad / min for 30 s to obtain the composite portland cement. The strength of the obtained composite portland cement is tested according to the standard GB / T 17671-1999, and the dry shrinkage is tested according to the standard JC / T 603-2004. The test results are shown in Table 1.

[0044] Comparative Example 2

[0045] A composite portland cement, by mass fraction (total 100 parts), is composed of 82 parts of portland cement clinker, 9 parts of early strength component and 9 parts of gypsum component; wherein the portland cement clinker is prepared by uniformly mixing 61.1 parts of limestone, 26 parts of shale, 10 parts of iron tailings, 2 parts of chalcocite and 0.9 parts of phosphorous slag, and calcining at 1320 ℃ for 2 hours, and has a mineral composition of C3S (tricalcium silicate): 38.6 parts, C2S (dicalcium silicate): 39.3 parts, C3A (tricalcium aluminate): 3.5 parts, C4AF (tetracalcium aluminoferrite): 18.6 parts, and a particle size distribution characteristic of D10 = 6.2 μm, D90 = 40.7 μm, and a uniformity index n of 1.45, and a characteristic particle size of 27.88 μm; wherein the early strength component is prepared by uniformly mixing 35 parts of F-class fly ash, 63 parts of limestone, 1.28 parts of magnesium oxide and 0.72 parts of soft manganite, and calcining at 1280 ℃ for 2.7 hours, and has a mineral composition of C A 20 A 13 M3S3(Q phase): 58 parts, C2S (dicalcium silicate): 42 parts, particle size greater than 200 mesh.

[0046] The low-shrinkage portland cement clinker, early strength component and dihydrate gypsum are mixed at a mixing speed of 1650 rad / min for 38 s to obtain the composite portland cement. The strength of the obtained composite portland cement is tested according to the standard GB / T 17671-1999, and the dry shrinkage is tested according to the standard JC / T 603-2004. The test results are shown in Table 1.

[0047] Comparative Example 3

[0048] A composite Portland cement, in terms of mass fraction (total 100 parts): composed of Portland cement clinker 72 parts, early strength component 14 parts, gypsum component 14 parts; wherein the Portland cement clinker is made of limestone 67 parts, mudstone 23 parts, iron tailings 8 parts, blue copper ore 1.2 parts and fluorite 0.8 parts uniformly mixed, calcined at 1280℃ for 3.8 hours, the mineral composition is C3S (tricalcium silicate): 48.8 parts, C2S (dicalcium silicate): 30.4 parts, C3A (tricalcium aluminate): 3.2 parts, C4AF (tetracalcium aluminoferrite): 17.6 parts, the particle size distribution characteristics are D10 = 3.3 μm, D90 = 50.8 μm, the uniformity index n is 1.08, and the characteristic particle size is 24.89 μm; wherein the early strength component is made of F-class fly ash 32 parts, limestone 66 parts, magnesium oxide 1.56 parts and chalcopyrite 0.44 parts uniformly mixed, calcined at 1250℃ for 3.2 hours, the mineral composition is C 20 A 13 M3S3 (Q phase): 54 parts, C2S (dicalcium silicate): 46 parts, and the particle size is greater than 200 mesh.

[0049] The Portland cement clinker, the early strength component and the dihydrate gypsum are mixed at a mixing speed of 1800 rad / min for 40 s to obtain the composite Portland cement. The strength of the obtained composite Portland cement is tested according to the standard GB / T17671-1999, and the dry shrinkage is tested according to the standard JC / T603-2004. The test results are shown in Table 1.

[0050] Comparative Example 4

[0051] A composite Portland cement, in terms of mass fraction (total 100 parts): composed of Portland cement clinker 68 parts, early strength component 20 parts, gypsum component 12 parts; wherein the Portland cement clinker is made of limestone 58 parts, clay 31 parts, iron tailings 9 parts, chalcopyrite 0.9 parts and gypsum 1.1 parts uniformly mixed, calcined at 1300℃ for 2.5 hours, the mineral composition is C3S (tricalcium silicate): 43.6 parts, C2S (dicalcium silicate): 34.8 parts, C3A (tricalcium aluminate): 2.1 parts, C4AF (tetracalcium aluminoferrite): 19.5 parts, the particle size distribution characteristics are D10 = 5.5 μm, D90 = 42.5 μm, the uniformity index n is 1.3, and the characteristic particle size is 28.50 μm; wherein the early strength component is made of F-class fly ash 53 parts, limestone 45 parts, magnesium oxide 1.68 parts and sphalerite 0.32 parts uniformly mixed, calcined at 1250℃ for 3 hours, the mineral composition is C 20 A 13 M3S3 (Q phase): 45 parts, C2S (dicalcium silicate): 55 parts, and the particle size is greater than 200 mesh.

[0052] The silicate cement clinker, early strength component and dihydrate gypsum are mixed at a mixing speed of 1700 rad / min for 38 s to obtain the composite silicate cement. The strength of the obtained composite silicate cement is tested according to the standard GB / T 17671-1999, and the dry shrinkage is tested according to the standard JC / T 603-2004. The test results are shown in Table 1.

[0053] Table 1

[0054]

[0055] The above only is the preferred embodiment of the present application, and is not used to limit the present application, for the person skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high early strength low shrinkage composite Portland cement, characterized by, The high-early-strength and low-shrinkage composite Portland cement comprises, in percentage by mass, 50-80 parts of low-shrinkage Portland cement clinker, 15-30 parts of early-strength component, and 5-15 parts of gypsum component. The low-shrinkage Portland cement clinker is prepared from calcareous raw material, silico-aluminous raw material, ferruginous raw material, first activator and mineralizer; the mineral composition of the low-shrinkage Portland cement clinker includes, in terms of mass fraction, C3S 30-50 parts, C2S 20-40 parts, C3A 0.5-5 parts, C4AF 10-25 parts; the particle size distribution characteristics of the low-shrinkage Portland cement clinker are D10≥5 μm, D90≤45 μm, uniformity index n is 1.2-1.6, and the characteristic particle size is 25-30 μm. The low-shrinkage Portland cement clinker is prepared from calcareous raw material, silico-aluminous raw material, ferruginous raw material, first activator and mineralizer; the mineral composition of the low-shrinkage Portland cement clinker includes, in terms of mass fraction, C3S 30-50 parts, C2S 20-40 parts, C3A 0.5-5 parts, C4AF 10-25 parts; the particle size distribution characteristics of the low-shrinkage Portland cement clinker are D10≥5 μm, D90≤45 μm, uniformity index n is 1.2-1.6, and the characteristic particle size is 25-30 μm. The early strength component is prepared from F-class fly ash or C-class fly ash, limestone, magnesium oxide and a second activator; the mineral composition of the early strength component includes, in mass fraction: C 20 A 13 M3S3 50-65 parts, C2S 35-50 parts; the raw material composition of the early strength component includes, in mass percentage: F-class fly ash or C-class fly ash 30-40 parts, limestone 55-70 parts, magnesium oxide 0.5-2 parts and a second activator 0.1-0.8 parts, the second activator including one of sphalerite, chalcopyrite and pyrolusite.

2. The high early strength low shrinkage Portland composite cement as claimed in claim 1, wherein, The raw material composition of the low-shrinkage Portland cement clinker comprises, in percentage by mass, 45-70 parts of calcareous raw material, 15-35 parts of siliceous and aluminous raw material, 8-15 parts of ferruginous raw material, 0.05-1.5 parts of mineralizer, and 0.8-2.5 parts of first activator.

3. The high early strength low shrinkage Portland composite cement as claimed in claim 1, wherein, The gypsum component is at least one of dihydrate gypsum, alpha hemihydrate gypsum, beta hemihydrate gypsum, alpha III type anhydrite, and beta III type anhydrite.

4. The high early strength low shrinkage Portland composite cement as claimed in claim 1, wherein, The calcareous raw material comprises one or more of limestone, marble, marl, and chalk; the siliceous and aluminous raw material comprises one or more of clay, shale, and mudstone; the ferruginous raw material comprises one of iron tailings, sulfuric acid slag, and copper slag; the first activator comprises one of chalcopyrite, chalcocite, and blue copper ore; and the mineralizer comprises one of gypsum, fluorite, slag, and phosphorous slag.

5. The high early strength low shrinkage Portland composite cement as claimed in claim 1, wherein, The low-shrinkage Portland cement clinker is sintered at a temperature of 1250-1350℃ for 2-4 hours, and the early-strength component is sintered at a temperature of 1200-1300℃ for 2-4 hours.

6. A method of producing a high early strength low shrinkage composite portland cement according to any one of claims 1 to 5, characterized by, The method comprises: The method comprises: The method comprises: The high-early-strength and low-shrinkage composite Portland cement is obtained by mixing the low-shrinkage Portland cement clinker, the early-strength component, and the gypsum component.

7. The method of producing a high-early-strength low-shrinkage composite portland cement according to claim 6, characterized by, The mixing mode of the low-shrinkage Portland cement clinker, the early-strength component, and the gypsum component is high-speed mixing, the mixing speed is 1000-2000 rad / min, and the mixing time is 20-60 s.

8. The method of making a high early strength low shrinkage Portland composite cement according to claim 6, wherein, The high-early-strength and low-shrinkage composite Portland cement has the following performances: 1-day compressive strength ≥ 15 MPa, 3-day compressive strength ≥ 30 MPa, 28-day compressive strength ≥ 45 MPa, and 28-day dry shrinkage rate ≤ 0.04%.

Images