High flexural strength composite Portland cement and preparation method thereof

Abstract

The invention belongs to the field of building materials, and especially relates to a high flexural strength composite Portland cement and a preparation method thereof. The high flexural strength composite Portland cement is prepared from, by weight, 35-65 parts of a Portland cement clinker, 17.5-40 parts of calcined clay, 10-22.5 parts of limestone and 1.5-5 parts of gypsum. The high flexural strength composite Portland cement mainly prepared from the ordinary Portland cement clinker, calcined clay and low-grade limestone concrete is prepared by starting from the concrete core raw material cement and improving the ratio of bending-compressive strength and the flexural strength of cement on the premise of ensuring a high compressive strength, and the preparation method has the characteristics of simple process, and suitableness for industrial production.

Description

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to a high-bending composite Portland cement and a preparation method thereof. Background technique

[0002] Existing techniques and drawbacks:

[0003] Cement, especially Portland cement, as the main and key cementitious material component of concrete and cement mortar materials widely used in construction, bridge, water conservancy and national defense, is the core contributor to its key performance indicators such as strength. The performance of cement directly determines the performance of concrete and cement mortar materials. However, due to the low flexural strength of the existing traditional Portland cement, it is easy to be cracked and damaged by the tensile stress generated during the shrinkage process during use, and it is increasingly difficult to meet the requirements of concrete. The development needs of high durability and long service life of buildings (...

Examples

preparation example Construction

[0041] A preparation method of high flexural composite Portland cement, the preparation method of high flexural composite Portland cement is used to prepare the high flexural composite Portland cement described in any one of the above, the high flexural composite The preparation method of Portland cement comprises the following steps:

[0042] Step 1: Taking materials according to the following proportions by weight of raw materials: 35-65 parts of Portland cement clinker, 17.5-40 parts of calcined clay, 10-22.5 parts of limestone, and 2.5-5 parts of gypsum;

[0043] Step 2: Mix the raw materials obtained in Step 1 except calcined clay, and grind them together until the specific surface area is 380-500m 2 / kg;

[0044] Step 3: Separately grind the calcined clay raw material obtained in Step 1 to a specific surface area of ​​550-900m 2 / kg;

[0045] The present invention adopts separate grinding, calcined clay is a soft material, and clinker and limestone are hard materials....

Embodiment 1-3 and comparative Embodiment 1-3

[0051] The components of Portland cement clinker, calcined clay and low-grade limestone are shown in Table 1:

[0052] Table 1: Raw material composition

[0053] raw material loss SiO 2

Al 2 o 3

Fe 2 o 3

CaO MgO SO 3

K 2 o

Na 2 o

TiO 2

Total Clinker 1 0.33 23.16 5.21 3.31 63.31 2.92 0.62 0.64 0.13 0.00 99.65 Calcined Clay 1 0.67 66.77 25.82 1.36 3.11 0.96 0.13 0.04 0.11 0.71 99.69 Limestone 1 36.38 13.06 0.58 0.24 46.02 1.01 0.52 0.13 0.02 1.80 99.76 plaster 1 21.39 6.66 2.22 0.83 29.32 1.82 38.04 0.44 0.11 0.10 100.98

[0054] For the mineral composition analysis of limestone 1, please refer to the attached figure 1 According to X-ray diffraction analysis, the main mineral contained in limestone 1 is calcite, followed by quartz, and then perovskite.

[0055] According to the proportions of the examples and comparative examples listed in Table 2,...

Embodiment 2

[0059] Embodiment 2 and comparative examples 2 and 3, that is, the high-bending composite Portland cement of the present invention is compared with the existing high-quality fly ash and ground slag powder of the same clinker coefficient of 0.50 to prepare composite Portland cement. The flexural strength that the invention focuses on is significantly improved, and the compressive strength is also very good, which reflects the improvement of the performance of the existing traditional materials by the present invention.

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to a high-bending composite Portland cement and a preparation method thereof. Background technique

[0002] Existing techniques and drawbacks:

[0003] Cement, especially Portland cement, as the main and key cementitious material component of concrete and cement mortar materials widely used in construction, bridge, water conservancy and national defense, is the core contributor to its key performance indicators such as strength. The performance of cement directly determines the performance of concrete and cement mortar materials. However, due to the low flexural strength of the existing traditional Portland cement, it is easy to be cracked and damaged by the tensile stress generated during the shrinkage process during use, and it is increasingly difficult to meet the requirements of concrete. The development needs of high durability and long service life of buildings (...

Examples

preparation example Construction

[0041] A preparation method of high flexural composite Portland cement, the preparation method of high flexural composite Portland cement is used to prepare the high flexural composite Portland cement described in any one of the above, the high flexural composite The preparation method of Portland cement comprises the following steps:

[0042] Step 1: Taking materials according to the following proportions by weight of raw materials: 35-65 parts of Portland cement clinker, 17.5-40 parts of calcined clay, 10-22.5 parts of limestone, and 2.5-5 parts of gypsum;

[0043] Step 2: Mix the raw materials obtained in Step 1 except calcined clay, and grind them together until the specific surface area is 380-500m 2 / kg;

[0044] Step 3: Separately grind the calcined clay raw material obtained in Step 1 to a specific surface area of ​​550-900m 2 / kg;

[0045] The present invention adopts separate grinding, calcined clay is a soft material, and clinker and limestone are hard materials....

Embodiment 1-3 and comparative Embodiment 1-3

[0051] The components of Portland cement clinker, calcined clay and low-grade limestone are shown in Table 1:

[0052] Table 1: Raw material composition

[0053] raw material loss SiO 2

Al 2 o 3

Fe 2 o 3

CaO MgO SO 3

K 2 o

Na 2 o

TiO 2

Total Clinker 1 0.33 23.16 5.21 3.31 63.31 2.92 0.62 0.64 0.13 0.00 99.65 Calcined Clay 1 0.67 66.77 25.82 1.36 3.11 0.96 0.13 0.04 0.11 0.71 99.69 Limestone 1 36.38 13.06 0.58 0.24 46.02 1.01 0.52 0.13 0.02 1.80 99.76 plaster 1 21.39 6.66 2.22 0.83 29.32 1.82 38.04 0.44 0.11 0.10 100.98

[0054] For the mineral composition analysis of limestone 1, please refer to the attached figure 1 According to X-ray diffraction analysis, the main mineral contained in limestone 1 is calcite, followed by quartz, and then perovskite.

[0055] According to the proportions of the examples and comparative examples listed in Table 2,...

Embodiment 2

[0059] Embodiment 2 and comparative examples 2 and 3, that is, the high-bending composite Portland cement of the present invention is compared with the existing high-quality fly ash and ground slag powder of the same clinker coefficient of 0.50 to prepare composite Portland cement. The flexural strength that the invention focuses on is significantly improved, and the compressive strength is also very good, which reflects the improvement of the performance of the existing traditional materials by the present invention.

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