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Recycled concrete doped with short-cut basalt fibers and recycled coarse aggregate

A technology of regenerated coarse aggregate and basalt fiber, which is applied in the field of building materials, can solve problems such as limited scope of application, high cost, and corrosion resistance of steel fibers, and achieve the goals of reducing environmental pollution, reducing production costs, and improving tensile strength Effect

Inactive Publication Date: 2017-08-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, researchers have proposed a preparation method for adding material fibers to improve its mechanical properties during the preparation of recycled concrete, including carbon fibers, steel fibers, polypropylene fibers, etc., which can improve the performance of recycled concrete to a certain extent, but there are also the following defects: 1) The cost is high, the price of carbon fiber is several times that of ordinary fiber, while the price of steel fiber is not high, but the amount of it is large, resulting in high cost of concrete production; (2) Some performance indicators are not good, polypropylene fiber and steel The tensile strength of fiber is much lower than that of many fibers, and steel fiber is not corrosion resistant, which is not good for the durability of concrete
Carbon fiber has poor high temperature resistance, and the scope of application is not wide

Method used

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  • Recycled concrete doped with short-cut basalt fibers and recycled coarse aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 (strength of recycled concrete is C30):

[0029] A high-performance recycled concrete mixed with chopped basalt fiber and recycled coarse aggregate, which consists of the following raw materials in parts by weight: 205 parts of water, 337 parts of ordinary Portland cement, 648 parts of medium sand, and 576 parts of natural gravel , 576 parts of recycled coarse aggregate, 37 parts of fly ash, 2.52 parts of water reducing agent, and 2.65 parts of chopped basalt fiber.

[0030] The parameters of various materials are as follows:

[0031] The water reducer is a polycarboxylic acid liquid high-efficiency water reducer with an effective content of 25% and a water reducing rate of 25%.

[0032] Chopped basalt fiber density 2650kg / m³, fiber length 18mm, diameter 15μm, tensile strength 2.63×10 3 MPa, tensile modulus of elasticity 85 GPa.

[0033] The fly ash is a high-quality Class II fly ash with a fineness of 17.5%, a water requirement of 99%, a loss on ignition o...

Embodiment 2

[0046] Example 2 (recycled concrete strength is C35):

[0047] A high-performance recycled concrete mixed with chopped basalt fiber and recycled coarse aggregate, which consists of the following raw materials in parts by weight: 205 parts of water, 376 parts of ordinary Portland cement, 597 parts of medium sand, and 580 parts of natural crushed stone , 580 parts of recycled coarse aggregate, 42 parts of fly ash, 2.51 parts of water reducing agent, and 2.65 parts of chopped basalt fiber.

[0048] The parameters of various materials are as follows:

[0049] The water reducer is a polycarboxylic acid liquid high-efficiency water reducer with an effective content of 25% and a water reducing rate of 25%.

[0050] Chopped basalt fiber density 2650kg / m³, fiber length 18mm, diameter 15μm, tensile strength 2.63×10 3 MPa, tensile modulus of elasticity 85 GPa.

[0051] The fly ash is a high-quality Class II fly ash with a fineness of 17.5%, a water requirement of 99%, a loss on igniti...

Embodiment 3

[0064] Example 3 (recycled concrete strength is C40):

[0065] A high-performance recycled concrete mixed with chopped basalt fiber and recycled coarse aggregate, consisting of the following raw materials in parts by weight: 205 parts of water, 415 parts of ordinary Portland cement, 589 parts of medium sand, and 597 parts of natural crushed stone , 597 parts of recycled coarse aggregate, 46 parts of fly ash, 2.77 parts of water reducing agent, and 2.65 parts of chopped basalt fiber.

[0066] The parameters of various materials are as follows:

[0067] The water reducer is a polycarboxylic acid liquid high-efficiency water reducer with an effective content of 25% and a water reducing rate of 25%.

[0068] Chopped basalt fiber density 2650kg / m³, fiber length 18mm, diameter 15μm, tensile strength 2.63×10 3 MPa, tensile modulus of elasticity 85 GPa.

[0069] The fly ash is a high-quality Class II fly ash with a fineness of 17.5%, a water requirement of 99%, a loss on ignition o...

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Abstract

The invention belongs to the field of building materials and in particular relates to recycled concrete doped with short-cut basalt fibers and recycled coarse aggregate. The recycled concrete is prepared from the following raw materials in parts by weight: 100-300 parts of water, 300-500 parts of ordinary Portland cement, 500-700 parts of medium sand, 500-650 parts of natural gravels, 500-650 parts of recycled coarse aggregate, 30-50 parts of fly ash, 1-5 parts of a water reducing agent and 1-6 parts of short-cut basalt fibers. The recycled concrete provided by the invention is low in preparation cost, and the obtained concrete has high temperature resistance, corrosion resistance, tensile strength, crack resistance and better durability property.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to recycled concrete mixed with chopped basalt fiber and recycled coarse aggregate. Background technique [0002] As the most widely used building material, the amount of concrete waste generated during the production and construction process and the demolition of buildings in our country is huge every year, which is difficult to handle and easily causes environmental pollution. In order to comply with the concept of green building and sustainable development, how to rationally utilize waste concrete and reduce the consumption of non-renewable natural resources in the preparation of concrete is an urgent problem to be solved. [0003] Recycled concrete is prepared by recycling and crushing waste concrete to obtain recycled coarse and fine aggregates, which replace natural aggregates. At present, there is quite little recycling of waste concrete in my country, most of which are use...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/06C04B14/02C04B14/46C04B18/167C04B18/08C04B2103/302
Inventor 方圣恩洪华山
Owner FUZHOU UNIV
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