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Method using lithium bentonite as cement product additive

A technology for lithium-based bentonite and cement products, which is applied in the application field of building materials and cement products, can solve the problems of complex wet modification process and high energy consumption, and achieves sufficient and uniform hydration reaction, simple production process and simple application. easy effect

Inactive Publication Date: 2013-02-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing modification methods of lithiated soil are all realized by wet method, but the wet modification process is complicated and consumes a lot of energy; the existing application of lithium-based bentonite is mainly in the form of inorganic gelling agent and suspending agent components Appeared, using its inorganic gel properties, did not develop and utilize the hydration effect of cement

Method used

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  • Method using lithium bentonite as cement product additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take natural calcium-based bentonite, dry it at 100°C, and crush it to less than 100 mesh. Get 1000 grams of dry bentonite powder, add 20 grams of lithium carbonate and mix evenly, add 1000 grams of water and mix and extrude the bentonite mud. ℃ drying, crushed into less than 100 mesh lithium-based bentonite powder for later use.

[0023] Take 100g of cement and 25g of fine sand as the raw material, add 0.5g of lithium-based bentonite to it, set up a blank control group (that is, without adding bentonite) and a comparative test of sodium-based and calcium-based soil, see the table below. For each group of cement samples, a plurality of cubic cement test blocks with a side length of 40 mm were made, and the compressive strength of the cement test blocks after curing for 5 days, 15 days and 28 days was tested. The results are shown in the table. From the data in the table, it can be seen that the compressive strength of the sample added with lithium-based bentonite is si...

Embodiment 2

[0027] Take natural sodium bentonite and dry it at 100°C, and crush it to less than 100 mesh. Get 1000 grams of dry bentonite powder, add 20 grams of lithium carbonate and mix evenly, add 1300 grams of water and mix and extrude the bentonite mud. ℃ drying, crushed into less than 100 mesh lithium-based bentonite powder for later use.

[0028] Take 1000g of cement, add 5g of lithium-based bentonite to it, and add appropriate amount of water to make a cubic cement test block with a side length of 40mm. The compressive strength of the sample was 12.8 MPa, and that of the control group was 11.26 MPa, and the compressive strength increased by 13.676%.

Embodiment 3

[0030] Take natural calcium-based bentonite, dry it at 100°C, and crush it to less than 100 mesh. Get 1000 grams of dry bentonite powder, add 30 grams of lithium carbonate and mix evenly, add 1000 grams of water and mix and extrude the bentonite mud. ℃ drying, crushed into less than 100 mesh lithium-based bentonite powder for later use.

[0031] Take 100g of cement and 260g of fine sand in the cement raw material, add 0.5g of lithium-based bentonite according to the proportion of 0.5wt% of the cement mass, add an appropriate amount of water, and make a cubic cement test block with a side length of 40mm. The cement test block is often Warm curing, the compressive strength was tested on the pressure testing machine for 7 days, the average reached 13.958MPa, the control sample was 12.482 MPa, and the compressive strength increased by 11.825%; the compressive strength of the experimental group reached 24.652MPa in 15 days, and the compressive strength of the control group was 18.0...

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Abstract

The invention relates to a method using lithium bentonite as a cement product additive and an application of the method using lithium bentonite as the cement product additive in cement product building materials. Natural calcium or sodium bentonite is taken to be dried, a lithium agent is added in parts by weight, water is added according to the material total ratio to mix and extrude, the mixture is fully mixed, then sealed, stored at 60 DEG C, dried and ground so as to obtain the lithium bentonite; and the lithium bentonite is added according to 0.3-3wt% of the crude cement usage of the cement product, and water is added so as to produce mud which is formed through a forming machine and is cured at normal temperature or in a steaming mode. The lithium bentonite is used as the additive to be added into the cement product, the dispersibility of the cement in the product can be obviously improved, the hydration reaction is complete and uniform, the early strength is greatly increased by above 20%, and the product performance is obviously improved. The production technology of the lithium bentonite is simple, raw materials are low in price and easy to obtain, and the lithium bentonite is simple and easy to be applied to the cement products.

Description

Technical field: [0001] The invention relates to a method for using lithium-based bentonite as an additive for cement products, and its application in building material cement products. Background technique: [0002] In today's various infrastructure constructions, including buildings, bridges, roads, dams, etc., a wide variety of building materials are used, among which inorganic cementitious materials have always been one of the most critical materials. Among inorganic cementitious materials, cement with hydraulic characteristics has always been the core material for cementing various powdery, granular, massive and fibrous materials into a solid whole. Although due to the high energy consumption and environmental pollution in the cement production process, people have paid great attention to the development of other low-energy inorganic cementitious materials, but due to the high strength, high water resistance, weather resistance, etc. The basic materials in the building...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10C04B22/08
Inventor 蒋引珊王青月刘振营乔禹毛成明张悦雒锋窦魁洲林晓
Owner JILIN UNIV