Corn fiber lightweight concrete

Abstract

In order to solve the problems of low compressive strength and breaking strength of lightweight concrete, the invention provides the chord fiber lightweight concrete. The chord fiber lightweight concrete is prepared from the following raw materials in parts by weight: 430 to 550 parts of cement, 200 to 300 parts of fly ash, 7 to 12 parts of polyphenyl granules, 0.5 to 1.2 parts of a foaming agent, 0.8 to 1.6 parts of basalt fiber, 0.02 to 0.1 part of triethanolamine and 150 to 220 parts of water. The density of the chord fiber lightweight concrete is 650-800 kg / m < 3 >, the compressive strength of the chord fiber lightweight concrete is larger than 10 MPa, the breaking strength of the chord fiber lightweight concrete is larger than 4.8 MPa, the compressive strength and the breaking strength of the chord fiber lightweight concrete are greatly superior to those of existing concrete, and the chord fiber lightweight concrete has great market prospects.

Description

Technical Field

[0001] The present application relates to the field of building materials, and in particular to a kind of black fiber lightweight concrete. Background Art

[0002] In recent years, the development of prefabricated houses has promoted the development of lightweight concrete. Compared with traditional cement concrete, lightweight concrete has the characteristics of light weight and is easy to construct and assemble quickly. Lightweight concrete, also known as foamed concrete, is a lightweight and porous building material that is made by adding foam to the concrete base material. It is mostly used for the insulation of the outer layer of houses and pipes. The main raw materials of foamed concrete are cement, admixtures with a certain submersible hardness, foaming agents, and foam stabilizers. There are more pores in lightweight concrete, which increases the brittleness of concrete, and the flexural strength and compressive strength are also greatly reduced compared to ordinary concrete.

[0003] In related studies, in order to improve the flexural properties of lightweight concrete, steel fibers were added to toughen lightweight concrete, but the improvement effect was not good. In addition, the density of steel fibers is relatively high, which affects the self-weight of lightweight concrete.

[0004] Therefore, there is an urgent need to develop a lightweight concrete that has higher compressive strength and flexural strength. Summary of the invention

[0005] In order to solve the problem of low compressive strength and flexural strength of lightweight concrete, the present application provides a black fiber lightweight concrete.

[0006] The present application provides a lightweight concrete, which adopts the following technical solution:

[0007] A kind of black fiber lightweight concrete, composed of the following raw materials in parts by weight:

[0008]

[0009] Optionally, the black fiber lightweight concrete is composed of the following raw materials in parts by weight:

[0010]

[0011] Optionally, the black fiber lightweight concrete is composed of the following raw materials in parts by weight:

[0012]

[0013] Optionally, the foaming agent is one or more of sodium dodecylbenzene sulfonate, sodium polyoxyethylene lauryl ether sulfate, and sodium polyoxyethylene methyl stearate ether sulfonate.

[0014] Optionally, the basalt fiber has a length of 10-16 mm.

[0015] Optionally, the basalt fiber is 12 mm in length.

[0016] Basalt fiber is a new type of inorganic environmentally friendly green high-performance fiber material. Its main components are oxides such as silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide and titanium dioxide. The raw material of basalt fiber is mainly pure natural basalt ore, which has abundant reserves. No harmful substances are precipitated during the production process, and it will not cause pollution to the atmosphere.

[0017] Basalt fiber has high tensile strength and modulus. When added to concrete, it forms a three-dimensional network structure, which increases the cohesion and toughness inside the mixture, giving the concrete excellent compressive strength and flexural strength.

[0018] The density of the Xuan Fiber lightweight concrete of the present invention is 650-800kg / m 3 Its compressive strength is greater than 10MPa and its flexural strength is greater than 4.8MPa, which are much better than the compressive strength and flexural strength of existing concrete and have great market prospects. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0020] Example 1

[0021] A kind of black fiber lightweight concrete, composed of the following raw materials in parts by weight:

[0022]

[0023] The length of the basalt fiber is 10 mm.

[0024] Example 2

[0025] A kind of black fiber lightweight concrete, composed of the following raw materials in parts by weight:

[0026]

[0027] The length of the basalt fiber is 16 mm.

[0028] Example 3

[0029]

[0030]

[0031] The basalt fiber has a length of 11 mm.

[0032] Example 4

[0033]

[0034] The length of the basalt fiber is 15 mm.

[0035] Example 5

[0036] A kind of black fiber lightweight concrete, composed of the following raw materials in parts by weight:

[0037] The basalt fiber has a length of 12 mm.

[0038] Comparative Example 1

[0039] A lightweight concrete is composed of the following raw materials in parts by weight:

[0040]

[0041]

[0042] The length of the glass fiber is 12 mm.

[0043] Comparative Example 2

[0044] A kind of black fiber lightweight concrete, composed of the following raw materials in parts by weight:

[0045]

[0046] The basalt fiber has a length of 12 mm.

[0047] The lightweight concrete of Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests, and the test results are shown in Table 1.

[0048] Table 1

[0049] <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) Flexural strength(MPa) Example 1 791 10.1 4.9 Example 2 758 10.5 5.1 Example 3 655 10.3 5.0 Example 4 702 10.6 5.3 Example 5 660 10.8 5.5 Comparative Example 1 950 9.3 3.3 Comparative Example 2 723 9.1 4.0

[0050] Mechanism analysis:

[0051] Comparative Examples 1-2 are all modified to some extent based on Example 5.

[0052] The compressive strength of the concrete without basalt fiber in comparative example 1 is 3.2MPa. When the load is close to the limit load, cracks appear and develop rapidly. Then, as the load increases, the cracks penetrate each other, and the concrete completely loses its bearing capacity and is completely destroyed. With the addition of basalt fiber, the limit load of concrete is greatly improved. The compressive strength of the concrete in Example 5 is 15.1MPa. When the concrete with basalt fiber is close to the limit load, the integrity of the concrete is still good. The side of the concrete expands slightly and develops slowly. The damage of the concrete under the load is prolonged. When the load is close to the limit value, the cracks on the side of the concrete penetrate and destroy the concrete, but no serious concrete spalling occurs. The reason is that the basalt fibers randomly distributed in the aggregate inhibit the expansion of cracks, improve the failure mode of concrete under pressure, and change the failure mode of concrete from brittle failure to ductile failure.

[0053] When load acts, the initial gap in basalt fiber concrete gradually expands. When the tensile stress in the matrix expands to the gap interface, the basalt fiber shares the shear stress or tensile stress generated by the external load on the interface, reducing the stress that the concrete should bear at the interface and improving the overall flexural properties of the concrete.

[0054] Aggregate-cement interface transition zone refers to the thin layer between aggregate and hydration products in concrete. Its bonding relies on van der Waals force, so the strength of the interface transition zone depends on the pores and volume in it. The addition of basalt fiber increases the bonding interface of different phases in the concrete matrix. Its microstructure is complex and uneven. Basalt fiber is well bonded with cement compounds in the matrix. The toughness of basalt fiber can effectively inhibit concrete cracking.

[0055] In Comparative Example 2, 2 parts of basalt fiber were added, and the dispersibility of basalt fiber in the slurry decreased, which seriously damaged the internal structure of the slurry and caused a decrease in compressive strength and flexural strength.

[0056] In summary, the Xuanxian lightweight concrete of the present invention has light weight, excellent compressive strength and flexural strength, is much better than existing products on the market, has broad market prospects, and is worthy of vigorous promotion.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A kind of black fiber lightweight concrete, composed of the following raw materials in parts by weight:

2. The black fiber lightweight concrete according to claim 1, characterized in that: The black fiber lightweight concrete is composed of the following raw materials in parts by weight:

3. The black fiber lightweight concrete according to claim 1, characterized in that: The black fiber lightweight concrete is composed of the following raw materials in parts by weight:

4. The black fiber lightweight concrete according to claim 1, characterized in that: The foaming agent is one or more of sodium dodecylbenzene sulfonate, sodium polyoxyethylene lauryl ether sulfate, and sodium polyoxyethylene methyl stearate ether sulfonate.

5. The black fiber lightweight concrete according to claim 1, characterized in that: The basalt fiber has a length of 10-16 mm.

6. The black fiber lightweight concrete according to claim 1, characterized in that: The basalt fiber has a length of 12 mm.

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