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Modified graphene oxide cement concrete early strength agent and application thereof

A technology of cement concrete and oxide stone, applied in the field of cement concrete early strength agent, can solve the problems affecting later strength, alkali aggregate reaction, corroded steel bars, etc., and achieve the effects of improving early strength, promoting early hydration process and reducing cost

Inactive Publication Date: 2016-10-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a modified graphene oxide cement concrete early strength agent to solve the problem of corroded steel bars in the existing early strength agent, causing alkali aggregate reaction, affecting the later strength, high cost

Method used

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  • Modified graphene oxide cement concrete early strength agent and application thereof
  • Modified graphene oxide cement concrete early strength agent and application thereof
  • Modified graphene oxide cement concrete early strength agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The size of the modified graphene oxide nanosheet is 0.5-2 μm, and the thickness is 0.8-1.6 nm. The microscopic morphology observed by transmission electron microscopy (TEM) is as follows: figure 1 shown. figure 1 Selected-area electron diffraction in the inset shows two sets of six-membered rings, representing a two-layer structure of graphene oxide in this region.

[0026] The modifier is a polycarboxylate superplasticizer with a mass fraction of 40%. The cement is PI52.5R Portland cement.

[0027] See Table 1 for the mixing ratio of comparative sample 1# and sample 2# to be tested in the present embodiment.

[0028] Table 1 1#, 2# cement mortar mix ratio

[0029]

[0030] (1) Preparation of GO

[0031] Add 1g of graphite powder into a three-necked flask, add 23ml of 98%wt concentrated sulfuric acid, stir in an ice-water bath at 0°C for 15mins; add 1g of NaNO to the mixed solution 3 (purity ≥ 99.0%), slowly add 3g potassium permanganate (purity ≥ 99.5%) after...

Embodiment 2

[0039] The size of the modified graphene oxide nanosheet is 0.5-2 μm, and the thickness is 0.8-1.6 nm. The microstructure observed by transmission electron microscopy (TEM) is as follows: figure 1 shown. figure 1 Selected-area electron diffraction in the inset shows two sets of six-membered rings, representing a two-layer structure of graphene oxide in this region.

[0040] The modifier is a polycarboxylate superplasticizer with a mass fraction of 40%. The cement used in this example is PI52.5R Portland cement.

[0041] See Table 2 for the mixing ratio of comparative sample 1# and test sample 2# in the present embodiment.

[0042] Table 2 1#, 2# cement mortar mix ratio

[0043]

[0044] (1) The preparation process of GO is the same as in Example 1.

[0045] (2) Modification of GO

[0046] The dosage of modifier PC is determined according to the water-cement ratio of cement mortar and the content of GO.

[0047] Weigh 0.05 g of dried graphene oxide with a high-precisi...

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Abstract

The invention discloses a modified graphene oxide cement concrete early strength agent and an application method thereof; the size of modified graphene oxide nanosheets is 0.5-2 [mu]m, and the thickness is 0.8-1.6 nm; the early strength agent is obtained by adding a polycarboxylate-type high-efficiency water reducing agent to modify graphene oxide. Before use, a diluted modified graphene oxide dispersion liquid is subjected to ultrasonic oscillation for 0.5-1 hrs and is used for replacing a liquid phase component in cement concrete, and the addition amount of graphene oxide is 0.01-0.2% of the total mass of a cementitious material. With use of the early strength agent and the optimized pretreatment process and adding amount, harmful substances cannot be introduced, so the early strength of the cement concrete can be improved significantly with relatively low addition amount.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a cement concrete early strength agent and an application method thereof. Background technique [0002] With the rapid development of my country's urbanization and expressways, higher requirements are placed on the performance of concrete. Not only is the concrete required to have high strength and durability, but at the same time it is hoped that the strength of the concrete will develop rapidly. Early-strength concrete can shorten the maintenance and reinforcement period of highways, bridges, ports, and airstrips, so as to open traffic as soon as possible. Not only that, early-strength concrete can also shorten the form removal time, improve formwork turnover efficiency, and shorten the construction period. Therefore, early-strength concrete has good economic benefits and broad application prospects. [0003] Concrete early strength agent refers to the admixture that can im...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B22/02C01B31/04C04B103/12
CPCC04B24/24C01P2004/04C01P2004/22C01P2004/61C01P2004/62C01P2004/64C04B22/02C04B2103/12
Inventor 郭新立赵丽葛创张弘毅王小娟郭丽萍刘加平
Owner SOUTHEAST UNIV
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