Cement containing large volume of fly ash and preparation method thereof

A technology of fly ash cement and large dosage, applied in the field of high dosage cement, can solve the problems of reduced early strength of cement, low activity of fly ash, limited application range, etc., achieves good surface activity, enhanced force, reduced cost effect

Active Publication Date: 2014-02-05
宁夏赛马水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low activity of fly ash, with the increase of the amount of fly ash in cement, the early strength of cement is significantly reduced, which limits its application range.

Method used

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  • Cement containing large volume of fly ash and preparation method thereof
  • Cement containing large volume of fly ash and preparation method thereof
  • Cement containing large volume of fly ash and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0029] The invention also discloses a preparation method of large-volume fly ash cement, comprising the following steps:

[0030] The nano-boehmite is evenly doped in the fly ash and Portland cement to obtain a large amount of fly ash cement.

[0031] The nano-boehmite must be uniformly doped in the fly ash and Portland cement, and the present invention has no special limitation on the specific doping method. The nano-boehmite can also be mixed with fly ash and Portland cement when in use. The preferred solution is: ultrasonically disperse the nano-boehmite in water, and the ultrasonic dispersion time is preferably 5 to 15 minutes ; Then, mix the fly ash and Portland cement with the aqueous solution uniformly dispersed with nano-boehmite, and then it can be used.

[0032] The high-volume fly ash cement of the present invention comprises: 30-70 wt% of fly ash; 0.01-10 wt% of nano-boehmite; the balance is Portland cement. Nano-boehmite particles are small, with excellent chemi...

Embodiment 1

[0036] The high-volume fly ash cement in this embodiment includes 220.5 grams of PI type Portland cement cement clinker (gypsum accounts for 4% of the clinker mass), 220.5 grams of fly ash and 9 grams of nano boehmite. The particle size of the nano-boehmite is 10-50nm, and the specific structure is as follows: figure 1 as shown, figure 1 It is the SEM photo of the nano-boehmite used in Example 1.

[0037] The large-volume fly ash cement in Example 1 was made into cement mortar to test its early strength.

[0038] Disperse 9 grams of nano-boehmite in water evenly for 10 minutes, with an ultrasonic power of 300w (DS-5510DTH ultrasonic cleaning machine), and then prepare cement mortar specimens according to the preparation process of ordinary cement mortar specimens in my country's current standards. After the test piece is made, put it into a standard curing room (temperature 20±1°C, relative humidity ≥95%) for curing, remove the mold after 1 day and continue the standard curin...

Embodiment 2

[0052] The high-volume fly ash cement in this embodiment includes 218.25 grams of PI type Portland cement, 225 grams of fly ash and 6.75 grams of nano-boehmite. The particle size of the nano-boehmite is 10-50 nm.

[0053] The large-volume fly ash cement in Example 1 was made into cement mortar to test its early strength.

[0054]Disperse 11.25 grams of nano-boehmite in water evenly for 10 minutes, with an ultrasonic power of 300w (DS-5510DTH ultrasonic cleaning machine), and then prepare cement mortar specimens according to the preparation process of ordinary cement mortar specimens in my country's current standards. After the test piece is made, put it into a standard curing room (temperature 20±1°C, relative humidity ≥95%) for curing, remove the mold after 1 day and continue the standard curing to the set age, and then the cement mortar test piece can be obtained. The components of the cement mortar test piece are shown in Table 1.

[0055] After curing to the experimental ...

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Abstract

The invention provides a cement containing large volume of fly ash. The cement includes 30-70 wt% of fly ash, 0.01-10 wt% of nano boehmite and the balance of Portland cement. Nano boehmite has small particles, excellent chemical and mechanical properties and good surface activity, and can be filled into the gaps among cement particles to enhance the forces among cement particles; and the nano boehmite can react with a cement clinker and fly ash to generate hydration products and promote the early hydration of cement, thereby improving the early strength of cement, increasing the addition of fly ash and reducing the cost.

Description

technical field [0001] The invention relates to the field of large-volume cement, in particular to large-volume fly ash cement and a preparation method thereof. Background technique [0002] Cement is an important building material widely used in roads, bridges, buildings and other infrastructure constructions. However, the cement production process needs to consume a large amount of cement clinker, and the production of cement clinker will consume a large amount of natural materials and cause serious environmental pollution. Using Portland cement clinker as little as possible and using industrial waste residue as much as possible to produce cement is a topic with environmental protection significance and economic value. [0003] Fly ash is one of the industrial wastes with the largest emission and stacking volume at present, but in our country, its utilization rate is less than 40%, and the remaining fly ash can only be stacked in a large area, which not only pollutes the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 朱建平朱孔赞赵建国赵洪义张战营朱化雨傅秀新宋南京徐明双殷俊峰
Owner 宁夏赛马水泥有限公司
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