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A kind of early strength agent for improving the strength of phosphogypsum-based cement concrete and its preparation method

A technology for cement concrete and phosphogypsum, which is applied in the field of building materials, can solve the problems of limiting the wide use of phosphogypsum-based cement concrete, insufficient ettringite generation, low early strength, etc., and achieves shortening of setting and hardening time, good strength development, The effect of improving the strength in the middle and late stages

Active Publication Date: 2016-01-06
广东武理湾区科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the study found that due to the retarding effect of gypsum and the low content of active aluminum in the raw materials, the early ettringite production of phosphogypsum-based cement is insufficient, the structure is loose, the early strength is low, and the 3-day strength is generally below 10MPa, which seriously limits Extensive use of phosphogypsum-based cement concrete

Method used

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  • A kind of early strength agent for improving the strength of phosphogypsum-based cement concrete and its preparation method
  • A kind of early strength agent for improving the strength of phosphogypsum-based cement concrete and its preparation method
  • A kind of early strength agent for improving the strength of phosphogypsum-based cement concrete and its preparation method

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Experimental program
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Effect test

Embodiment 1-6

[0026] Examples 1-6: Table 1 shows the proportioning ratio of each raw material of the accelerator for increasing the strength of phosphogypsum-based cement concrete.

[0027] The proportioning ratio of each raw material of table 1 early strength agent

[0028]

[0029] The metakaolin is ground kaolinite, calcined at 750°C for 4 hours, cooled, and mechanically dispersed to obtain a specific surface area of ​​8000-15000m 2 / kg of metakaolin.

[0030] SiO of the silica fume 2 The content is not less than 85wt%, and the specific surface area is not less than 18000m 2 / kg.

[0031] The specific surface area of ​​the sulphoaluminate cement is not less than 3000m 2 / kg, main mineral The content is not less than 55wt%.

[0032] The polycarboxylate water reducer is a powdery polycarboxylate water reducer, and the water reducing rate is not less than 20%.

[0033] Above-mentioned a kind of preparation method for improving the early strength agent of phosphogypsum-based cemen...

Embodiment 7-12

[0051] Embodiment 7-12: Table 5 shows the proportioning ratio of each raw material of the accelerator for improving the strength of phosphogypsum-based cement concrete.

[0052] The proportioning ratio of each raw material of table 5 early strength agent

[0053]

[0054] The metakaolin is ground kaolinite, calcined at 750°C for 4 hours, cooled, and mechanically dispersed to obtain a specific surface area of ​​8000-15000m 2 / kg of metakaolin.

[0055] SiO of the silica fume 2 The content is not less than 85wt%, and the specific surface area is not less than 18000m 2 / kg.

[0056] The specific surface area of ​​the sulphoaluminate cement is not less than 3000m 2 / kg, main mineral The content is not less than 55wt%.

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Abstract

The invention belongs to the technical field of building materials. An early strength agent for improving the strength of phosphogypsum-based cement concrete is characterized in that it is mainly composed of sulphoaluminate cement, metakaolin, silica fume and polycarboxylate water reducing agent raw materials, wherein the mass of each raw material is The percentages are: metakaolin 0.1-50%, silica fume 0.1-50%, sulphoaluminate cement 20-70%, polycarboxylate superplasticizer 0.1-3%. The addition of the early strength agent can greatly shorten the setting and hardening time of cement concrete, and improve the early and long-term compressive strength of mortar and concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an early strength agent for improving the strength of phosphogypsum-based cement concrete and a preparation method thereof. Background technique [0002] Phosphogypsum-based cement is a new type of environmentally friendly cementitious material. The main components are phosphogypsum, slag and a small amount of steel slag and clinker. This cement uses alkali excitation and sulfate excitation slag and hydration products to wrap excess phosphogypsum, etc. The hydraulic gelling material designed and prepared according to the principle has excellent properties such as strong impermeability and resistance to sulfate erosion. [0003] The patent application number 201210242381.5, "Phosphogypsum modification method that can shorten the setting time of phosphogypsum-based concrete", specifically introduces the modification process of phosphogypsum-based cement. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06
Inventor 水中和田素芳陆建鑫丁沙曾潇
Owner 广东武理湾区科技发展有限公司