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A kind of high flexure-resistant composite Portland cement and its preparation method

A technology for compounding silicate and Portland cement, applied in the field of building materials, can solve the problems of limited improvement range, decreased compressive strength, and excessive mixing amount, etc., to improve the structural strength in all directions and the flexural strength. Effect

Active Publication Date: 2021-05-28
SINOMA INT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By adding mixed materials such as fly ash and finely ground slag powder to the cement, the cement hydration product is denser, which can increase the flexural strength and compressive ratio of the cement to a certain extent, thereby improving the flexural strength of concrete and cement mortar. , but the range of improvement is very limited, and the addition of too much will cause a significant drop in compressive strength

Method used

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  • A kind of high flexure-resistant composite Portland cement and its preparation method
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  • A kind of high flexure-resistant composite Portland cement and its preparation method

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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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Abstract

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. The high-bending composite Portland cement is made of the following raw materials in parts by weight: 35-65 parts of Portland cement Clinker, 17.5‑40 parts calcined clay, 10‑22.5 parts limestone, 1.5‑5 parts gypsum. The invention provides a concrete core raw material starting from cement itself, on the basis of ensuring high cement compressive strength, the folding ratio is increased, the cement flexural strength is improved, and ordinary Portland cement clinker, calcined A high-bending composite Portland cement prepared with clay and low-grade limestone as main raw materials and a preparation method with the characteristics of simple process and suitable 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 (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/04C04B7/52C04B7/38
CPCC04B7/04C04B7/38C04B7/52
Inventor 王彬隋同波韩辉赵艳妍
Owner SINOMA INT ENG
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