Alkaline activity inhibition material based on active sandstone aggregate and preparation method thereof

A technology of alkali activity and sandstone, which is applied in the field of concrete engineering, can solve the problems of untested long-term effect, poor adaptability, research on alkali activity inhibitory materials has not been reported, etc., to achieve secondary utilization of waste into treasure and reduce accumulation Land occupation and significant economic benefits

Active Publication Date: 2017-06-27
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The application of multi-component admixture compounding technology has the advantages of not changing the concrete construction conditions, simple operation, and less dosage, and is favored by the engineering community; however, the long-term effect of multi-component compounding technology on inhibiting the Variety of organic materials may create poor compatibility with other raw materials
[0008] At present, there are no reports on the use of active aggregates to prepare alkali activity-inhibiting materials.

Method used

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  • Alkaline activity inhibition material based on active sandstone aggregate and preparation method thereof
  • Alkaline activity inhibition material based on active sandstone aggregate and preparation method thereof
  • Alkaline activity inhibition material based on active sandstone aggregate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] A preparation method of an alkali activity inhibiting material based on active sandstone aggregate, comprising the following steps:

[0048] (1) The sandstone aggregate with potentially harmful alkali activity is ground through an RM2200 vertical mill, and the feed rate of the mill is controlled to 22t / h, the speed of the separator is 40Hz, the pressure of the grinding roller is 6.7MPaMPa, the temperature of the inlet mill is 190℃, and the outlet temperature is 190℃. The grinding temperature is 71°C, and the sandstone fine powder with a sieve residue of 45 μm and 5.5% is obtained.

[0049] (2) The sandstone fine powder obtained by step (1) is continuously put into the SMQ conical ball mill for secondary grinding, the mass ratio of the ball to material is controlled at 5:1, the ball milling speed is 300r / min, and the grinding time is 90min. The specific surface area is 950m 2 / kg sandstone powder.

[0050] (3) Take 87% medium heat cement, 10% sandstone powder and 3% na...

Embodiment 2

[0052] A preparation method of an alkali activity inhibiting material based on active sandstone aggregate, comprising the following steps:

[0053] (1) The sandstone aggregate with potentially harmful alkali activity is ground through an RM2200 vertical mill, and the feed rate of the mill is controlled to 22t / h, the speed of the separator is 40Hz, the pressure of the grinding roller is 6.7MPaMPa, the temperature of the inlet mill is 190℃, and the outlet temperature is 190℃. The grinding temperature is 71°C, and the sandstone fine powder with a sieve residue of 45 μm and 5.5% is obtained.

[0054] (2) The sandstone fine powder obtained by step (1) is continuously put into the SMQ conical ball mill for secondary grinding, the mass ratio of the ball to material is controlled at 5:1, the ball milling speed is 200r / min, and the grinding time is 50min. The specific surface area is 645m 2 / kg sandstone powder.

[0055] (3) Take by weight 82% medium heat cement, 15% sandstone powder...

Embodiment 3

[0057] A preparation method of an alkali activity inhibiting material based on active sandstone aggregate, comprising the following steps:

[0058] (1) The sandstone aggregate with potentially harmful alkali activity is ground through an RM2200 vertical mill, and the feed rate of the mill is controlled to 16t / h, the separator speed is 40Hz, the pressure of the grinding roller is 7.0MPa, the temperature of the inlet mill is 154°C, and the outlet temperature is 154°C. The grinding temperature is 70°C, and the sandstone fine powder with a sieve residue of 45 μm and 3.0% is obtained.

[0059] (2) The fine sandstone powder obtained in step (1) is put into the SMQ conical ball mill for secondary grinding, the mass ratio of the ball to material is controlled at 5:1, the ball milling speed is 200r / min, and the grinding time is 50min. The specific surface area is 662m 2 / kg sandstone powder.

[0060] (3) Take 77% medium heat cement, 20% sandstone powder and 3% nanometer SiO by mass r...

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Abstract

The invention provides an alkaline activity inhibition material based on active sandstone aggregate and a preparation method of the alkaline activity inhibition material. By adopting the sandstone aggregate with potential alkaline activity, sandstone powder with the specific surface area of (645 to 950) m<2>/kg is prepared through twice grinding of a vertical mill and a ball mill, and the sandstone powder is uniformly mixed with medium heat cement and nano SiO2 in a certain proportion. The inhibition material is prepared from the following raw materials in percentages by weight: 75% to 87% of the medium heat cement, 10% to 20% of the sandstone powder and 3% to 5% of the nano SiO2. The alkaline activity inhibition material prepared in the invention has the technical advantages that the raw materials are easy to get, the machinability is good, the preparation technology is simple, the alkaline activity inhibition effect is obvious, and the preparation process is free of pollution to the environment, and is beneficial to large-scale production and application of engineering.

Description

technical field [0001] The invention relates to concrete engineering fields such as construction, transportation, energy, railways, etc., in particular to an alkali activity inhibiting material based on active sandstone aggregate and a preparation method thereof. Background technique [0002] Concrete alkali-aggregate reaction (Alkali-Aggregate Reaction) refers to the chemical reaction between the alkali in the concrete and the alkali-active aggregate, which causes the volume expansion and cracking of the concrete, reduces the durability of the concrete, and shortens the service life of the concrete structure. [0003] Alkali-aggregate reaction is a relatively slow process, and sometimes it takes years or even decades for cracks to appear, especially for some slow-expanding active aggregates, this time will be longer. Since the designed service life of water conservancy and hydropower projects is as long as a hundred years, and the humid environment in which hydraulic concre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06C04B103/60
CPCC04B40/0042C04B2103/60C04B7/02C04B14/06C04B22/06
Inventor 陈霞杨华全董芸张建峰李鹏翔周世华石妍李响王磊林育强张亮苏杰闫小虎吕兴栋
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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