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A test method for composite modified concrete and its interfacial transition zone

A technology of interfacial transition zone, composite modification, used in the application of stable tension/pressure to test material strength, measurement device, climate sustainability, etc.

Active Publication Date: 2021-04-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no compound modification method for the transition zone of the concrete interface, and as the weak link of concrete, the modification of the transition zone of the concrete interface is very important

Method used

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  • A test method for composite modified concrete and its interfacial transition zone
  • A test method for composite modified concrete and its interfacial transition zone
  • A test method for composite modified concrete and its interfacial transition zone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0040]The raw material was measured according to the following coordination ratio: 100 parts of cement, 250 stones, 39 sand, 39 of the water, 30 of the fly ash, 1.2 parts of nanosoxide, and 0.5 high-efficiency water reducer.

[0041]The preparation process of the above modified concrete is as follows:

[0042](1) First put the nano silica and all water into the ultrasonic system, the ultrasonic system has a working frequency of 40 kHz, and the ultrasonic power supply is 50 W to prepare the nano-modified dispersion;

[0043](2) The cement, fly ash, silica gray, stone, sand, and high-efficiency water reducer are then stirred in a concrete mixer, so that all raw materials can be uniformly mixed;

[0044](3) Then, then poured the nano dispersion into the stirrer for 6 minutes until a uniform concrete mixture was obtained;

[0045](3) Put the concrete mixture into the mold, and rearrange the mold after one day, and maintenance under the standard conditions.

[0046]The method of transition bonding strengt...

Embodiment example 2

[0051]The raw material was measured according to the following coordination ratio: 100 parts of cement, 250 pieces of stone, 39 sanding, 39 pieces of water, 5 serviles, 1.5 nano silica, and 1.5 high-efficiency water reducer.

[0052]The preparation process of the above modified concrete is as follows:

[0053](1) First put the nano silica and all water into the ultrasonic system, the ultrasonic system has a working frequency of 40 kHz, and the ultrasonic power supply is 50 W to prepare the nano-modified dispersion;

[0054](2) The cement, fly ash, silica gray, stone, sand, high-efficiency water reducer are placed in a concrete mixer for 4 min, so that all raw materials can be uniformly mixed;

[0055](3) Then pour the nano-modified dispersion into the stirrer for 6 minutes until a uniform concrete mixture is obtained;

[0056](4) Put the concrete mixture into the mold, rewind the mold after one day, and maintenance under standard conditions.

[0057]Method of transition bonding strength test of concr...

Embodiment example 3

[0059]The raw material was measured according to the following ratio: 100 parts of cement, 250 stones, 39 sand, 39 pieces of water, 3 of the fly ash, 9 pieces of silica, and 1.8 parts of nano-titanium dioxide and 1 high-efficiency water reducer.

[0060]The preparation process of the above modified concrete is as follows:

[0061](1) First, the nano titanium dioxide and all water are placed in the ultrasound system, and the operating frequency of the ultrasound system is 40 kHz, the ultrasonic power supply is 50 W, to prepare the nano modified agent dispersion;

[0062](2) The cement, fly ash, silica gray, stone, sand, high-efficiency water reducer are placed in a concrete mixer for 4 min, so that all raw materials can be uniformly mixed;

[0063](3) Then pour the nano-modified dispersion into the stirrer for 6 minutes until a uniform concrete mixture is obtained;

[0064](4) Put the concrete mixture into the mold, rewind the mold after one day, and maintenance under standard conditions.

[0065]Meth...

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Abstract

The invention discloses a method for compositely modifying a concrete interface transition zone, which relates to the field of building materials. The composite modified concrete is characterized in that: raw materials are weighed according to the following parts by weight: 100 parts of cement; 240-260 parts of stone; 150-170 parts of sand; 35-45 parts of water; 20-30 parts of fly ash; 3‑12 parts of ash; 0.5‑2 parts of nanomaterials; 0.5‑1.5 parts of superplasticizer. This method uses the synergy between nanomaterials and silica fume in particle size distribution and pozzolanic activity, so as to better absorb the calcium hydroxide enriched in the transition zone of the concrete interface to generate a C‑S‑H gel with better cohesive force. The particle gradation can better fill the voids in the interfacial transition zone, thus effectively improving the interfacial transition zone of concrete. The case proves that this composite modification method can effectively improve the bond strength and compact interface transition zone of the interface transition zone, thereby improving the mechanical properties and chloride ion penetration resistance of concrete.

Description

Technical field[0001]The present invention relates to the field of building materials, and more particularly to a test method of composite modified concrete and its interface transition zone.Background technique[0002]Cement concrete is the most widely used building materials in modern use. The transition area of ​​concrete is the weak link of concrete, and has an important impact on the strength and durability of concrete. Due to the low density of the region, calcium hydroxide is enriched and has certain orientation, the morphology of the hydration product, the composition and structure, etc., which have a large difference inside the cement concrete, which makes the concrete interface transition zone It directly affects the mechanical properties and durability of the concrete, therefore the optimization of the interface transition zone of concrete is critical to the durability of concrete.[0003]At present, the mineral blend is widely applied to concrete, but silicone ash as an acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/06C04B18/08C04B18/14C04B14/30C04B20/00G01N3/08G01N15/08G01N19/04
CPCC04B14/062C04B14/305C04B18/08C04B18/146C04B20/008C04B28/04C04B2201/10C04B2201/50G01N3/08G01N15/08G01N19/04C04B14/02C04B14/06C04B22/002C04B2103/302Y02W30/91
Inventor 周宗辉王衍升程勇袁连旺王金邦程新
Owner UNIV OF JINAN
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