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Ultra-high performance concrete mixed with seawater and prepared from full coral aggregate and preparation method thereof

An ultra-high-performance concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems affecting the compactness of concrete, reduce the mechanical properties and durability of concrete, and achieve the reduction of preparation costs, Avoid corrosion and erosion, ensure the effect of mechanical properties

Inactive Publication Date: 2020-09-04
INST OF DEFENSE ENG ACADEMY OF MILITARY SCI PLA CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the self-shrinkage is not controlled, it is easy to form internal cracks before the concrete hardens, affecting the compactness of the concrete, thereby reducing the mechanical properties and durability of the concrete

Method used

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  • Ultra-high performance concrete mixed with seawater and prepared from full coral aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Weigh 0.21kg of polycarboxylate high-performance water reducer and 2.15kg of seawater, stir evenly, and set aside;

[0057] 2) Weigh 5.67kg of Portland cement of 43.5 strength grade, 2.15kg of silica fume with a silica content of 97%, 1.4kg of slag with a calcium oxide content of 55%, and coal ash aluminosilicate content of 97% with a particle size of 9.5 μm. % of 0.63kg microbeads and other gelling materials, dry mix for 1 minute;

[0058] 3) Weigh 2.2kg of coral fine sand with a particle size of 0.075mm, 6.0kg of coral medium sand with a particle size of 0.3mm, and 1.20kg of coral coarse sand with a particle size of 1.1mm, and add all the coral sand to the mixture prepared in step 2) , continue to dry mix for 2.5 minutes;

[0059] 4) Add the water reducer and seawater mixed solution prepared in step 1) to the mixture prepared in step 3), stir for 1.5 minutes while adding, and add 2 / 3 of the mixed solution;

[0060] 5) Weigh 0.045kg of polyvinyl alcohol fibers wit...

Embodiment 2

[0064] 1) Weigh 0.23kg of polycarboxylate high-performance water reducer and 2.32kg of seawater, stir evenly, and set aside;

[0065] 2) Weigh 5.67kg of Portland cement of 42.5 strength grade, 2.32kg of silica fume with a silica content of 95%, 1.47kg of slag with a calcium oxide content of 50%, and coal ash aluminosilicate with a particle size of 9 μm and a content of 96%. 0.74kg of microbeads and other gelling materials, dry mixed for 1.5 minutes;

[0066] 3) Take by weighing 2.38kg of coral fine sand with a particle diameter of 0.17mm, 6.41kg of coral medium sand with a particle diameter of 0.4mm and 1.25kg of coral coarse sand with a particle diameter of 0.6mm, and add all the coral sand to the preparation prepared in step 2) In the mixture, continue to dry mix for 1.5 minutes;

[0067] 4) Add the water reducer and seawater mixed solution prepared in step 1) to the mixture prepared in step 3), stir for 2 minutes while adding, and add 2 / 3 of the mixed solution;

[0068] 5...

Embodiment 3

[0072] 1) Weigh 0.22kg of polycarboxylate high-performance water reducer and 2.23kg of seawater, stir evenly, and set aside;

[0073] 2) Weigh 5.67kg of ordinary Portland cement, 2.23kg of silica fume with a silica content of 98%, 1.3kg of slag with a calcium oxide content of 52%, and 0.52 kg of coal ash with a particle size of 9.3 μm and aluminosilicate content of 95%. kg microbeads and other gelling materials, dry mix for 0.5 minutes;

[0074] 3) Weigh 2.15kg of coral fine sand with a particle size of 0.3mm, 5.61kg of coral medium sand with a particle size of 0.6mm, and 1.13kg of coral coarse sand with a particle size of 1.18mm, and add all the coral sand to the mixture prepared in step 2) , continue to dry mix for 2 minutes;

[0075] 4) Add the water reducer and seawater mixed solution prepared in step 1) to the mixture prepared in step 3), stir for 2.5 minutes while adding, and add 2 / 3 of the mixed solution;

[0076] 5) Weigh 0.045 kg of polyvinyl alcohol fibers with a d...

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Abstract

The invention discloses ultra-high performance concrete mixed with seawater and prepared from full coral aggregate. The concrete comprises cement, silica fume, slag, micro-beads, coral fine sand, coral medium sand, coral coarse sand, polyvinyl alcohol fiber, polypropylene fiber, a polycarboxylate superplasticizer and seawater in a weight ratio of 1: (0.38-0.41): (0.23-0.26): (0.092-0.13): (0.38-0.42): (0.99-1.13): (0.2-0.22): (0.008-0.01): (0.026-0.028): (0.038-0.041): (0.38-0.41). The invention further discloses a preparation method of the ultra-high performance concrete mixed with seawater and prepared from full coral aggregate. The concrete provided by the invention not only has good mechanical properties and durability, but also has the characteristics of low self-contractibility and high compactness.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to seawater-mixed, all-coral aggregate ultra-high performance concrete and a preparation method thereof. Background technique [0002] my country has nearly 3 million square kilometers of sea area, rich in marine resources, and more than 260 islands and reefs. Marine islands and reefs are the foothold of marine development and protection of marine rights and interests. They are related to national sovereignty and security. They are also an important support for the development of marine economy. Military fortifications and other island and reef engineering construction tasks are arduous and require the use of a large amount of concrete. [0003] Oceanic islands and reefs are far away from the inland and lack of conventional building materials such as fresh water, coarse and fine aggregates, and steel bars. The raw materials for island and reef engineering co...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/28C04B16/06C04B18/14C04B111/22C04B111/24C04B111/34
CPCC04B28/04C04B2111/22C04B2111/24C04B2111/343C04B2201/50C04B2201/52C04B18/146C04B18/141C04B18/082C04B14/28C04B20/0076C04B20/008C04B16/0641C04B16/0633C04B2103/302C04B22/0026Y02W30/91
Inventor 刘晋铭欧忠文谢伟梅勇胡志德罗伟
Owner INST OF DEFENSE ENG ACADEMY OF MILITARY SCI PLA CHINA
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