Method for solving sugaring problem of cement concrete by using bentonite

A technology of cement concrete and bentonite, which is applied in the field of using bentonite to solve the sanding of cement concrete, can solve problems such as incompatibility of organic matter and inorganic matter, and achieve the effects of improving construction workability, improving project quality and reducing environmental pressure.

Inactive Publication Date: 2013-12-25
尹无忌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods, due to economic reasons, or the incompatibility of organic and inorganic substances, can only be used in more important projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] There is an existing Φ3.5×48m dry-process rotary kiln manufacturer, the main product is 32.5 grade cement, the cement admixture is slag, fly ash, limestone 1:1:1, the total amount of admixture is 48% on average, and the finished product Cement fineness 80um sieve <6%, standard consistency 23.2%, average initial setting time 142 minutes, final setting time average 208 minutes, 3d average compressive strength 15.8MPa, flexural 1.7MPa, 28-day average compressive strength 35.2MPa , Anti-bending 3.6MPa, when used, the cement does not have slurry, bleeds, poor adhesion, serious sanding on the surface, many cracks, and many users have criticized it.

[0015] Use the method of the present invention to mix in cement grinding, and buy bentonite dried by villagers as a modified water-retaining component. The content of montmorillonite is 76%. The price is 52 yuan / t lower than 21 yuan / t, 5% bentonite is used to replace 5% admixture, and the ingredients are ground according to the o...

Embodiment 2

[0017] There is an existing Φ4×64m dry-process rotary kiln production enterprise. The production process is to grind clinker and admixture into clinker powder and slag powder respectively, and then blend them in a certain proportion to produce 42.5 grade and 32.5 grade finished cement. The blending material of grinding slag powder is slag, coal cinder, fly ash, limestone 2:1:2:1, and it is made by grinding with 5% gypsum ingredients. The calculation cost of slag powder is 126 yuan / t, and its main product is civil The average dosage of 32.5 grade cement slag powder is 52%, clinker powder is 48%, and the standard consistency is 23.5%. The average initial setting time is 161 minutes, and the average final setting time is 227 minutes. 1.9MPa, 28-day average strength compressive strength 36.4MPa, flexural resistance 3.6MPa, when used, the cement does not grout and bleeds, the surface is severely sanded, there are many tortoises and cracks, and users often complain.

[0018] Use the...

Embodiment 3

[0020] There is an existing masonry ash production enterprise whose main product is masonry cement. The ingredients of masonry cement are 15% clinker, 25% slag, 25% slag, 10% lime slag, and 25% limestone. The finished masonry cement finely ground The sieve residue of 80μm is less than 12%, the standard consistency is 23.2%, the average initial setting time is 242 minutes, and the average final setting time is 307 minutes. Fold 1.4MPa. Users reported that the masonry cement does not have slurry when it is used, severe bleeding, poor adhesion, serious sanding on the surface, many cracks and easy shelling, which is often criticized by users and difficult to promote.

[0021] The factory price of dry bentonite is 33 yuan / t, and the average montmorillonite content is 86%, which is 15 yuan / t lower than the comprehensive average price of slag, slag and gravel slag, which is 48 yuan / t. According to the original process, the bentonite equivalent to 15% of the total weight of cement In...

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PUM

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Abstract

The invention discloses a method for solving the sugaring problem of cement concrete by using bentonite. The method is characterized by comprising the following step: preparing bentonite or modified bentonite into powder of which residue on a 80 m um sieve is not more than 18%, mixing the bentonite powder with ground concrete powder, and homogenizing to obtain concrete powder containing bentonite; or mixing bentonite powder of which residue on a 80 m um sieve is not more than 18% with cement concrete in proportion during the mixing process of cement concrete; or during the grinding process of cement, adding bentonite serving as a modifying admixture, clinker, other admixtures and gypsum together in a cement grinding mill for grinding so as to obtain cement with qualified fineness, wherein the weight of bentonite blocks or bentonite powder accounts for 1.5-20% of the total weight of cement. The method is simple and feasible; the used bentonite has the advantages of large geological reserves, broad distribution, wide resources, low cost and good economical performance; the method is beneficial to the alleviation of environment stress caused by cement product and improvement of construction quality.

Description

technical field [0001] The invention relates to a method for using bentonite to solve the sanding of the cement concrete surface layer, in particular to a method for using bentonite as a modified water-retaining component to solve the sanding of the cement concrete. Background technique [0002] Cement is the most widely used hydraulic binding material, and its hydration hardening process needs to retain water. [0003] When cement mixed with sand and gravel is used in engineering, during the process of hydration and hardening, the moisture in the concrete surface layer is very easy to evaporate and lose, especially in the current cement manufacturing enterprises, in order to reduce production costs, a large amount of industrial waste or ridges are added. Cement with inert fillers such as limestone, raw gangue or black shale, due to the low surface energy of the waste slag or filler particles in the cement particles and the extremely poor association ability with water molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C04B103/46
Inventor 尹无忌
Owner 尹无忌
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