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Machine-made sand fair-faced concrete mixer

A technology of fair-faced concrete and machine-made sand, applied in the field of machine-made sand fair-faced concrete mixtures and concrete mixtures, can solve the effect of the realization of the surface finish effect, the gradation, the poor particle shape, and the bleeding and segregation of the fresh concrete. and other problems, to achieve the effect of mass production, saving natural resources, and promoting and applying high value.

Inactive Publication Date: 2009-01-28
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Machine-made sand has been widely used in ordinary concrete in recent years, but due to its poor gradation and particle shape, it is easy to cause bleeding and segregation of freshly mixed concrete. If it is used to mix fair-faced concrete mixture, the concrete will harden. The surface of the body is prone to appearance phenomena such as "flower surface" and "water line" caused by the poor water retention performance of concrete, which will affect the realization of the clear water finish effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 300kg of cement, 200kg of mineral powder, 15kg of titanium dioxide, 760kg of machine-made sand, 1000kg of gravel, 5.2kg of polycarboxylate superplasticizer, add 150kg of water and mix.

[0022] Among them, the cement strength is 42.5Mpa; the grade of mineral powder is S95, the whiteness of powder is ≥80%, and the specific surface area is 450m 2 / kg, flow ratio 112%; titanium dioxide is ordinary titanium dioxide; machine-made sand is crushed from pebbles, the fineness modulus is 2.8, the gradation meets the sand edge requirements in Zone II, and the stone powder content is 9%; crushed stone It is 5-25mm continuous gradation, after washing, the mud content is 0.8%; the polycarboxylate superplasticizer has a solid content of 20%.

[0023] The color of freshly mixed concrete and hardened concrete is light white, the strength of 3 days is 43.2Mpa, the strength of 7 days is 60.3Mpa, and the strength of 28 days is 80.5Mpa.

Embodiment 2

[0025] Take 200kg of cement, 180kg of mineral powder, 20kg of silicon powder, 4kg of titanium dioxide, 820kg of machine-made sand, 1060kg of gravel, 4kg of polycarboxylate superplasticizer, add 150kg of water and mix.

[0026] Among them, the cement strength is 45.6Mpa; the grade of mineral powder is S95, the whiteness of powder is ≥80%, and the specific surface area is 480m 2 / kg, flow ratio 115%; titanium dioxide is rutile R-930; machine-made sand is crushed from pebbles, the fineness modulus is 2.5, the gradation meets the sand edge requirements in Zone II, and the stone powder content is 8%; The gravel is 5-25mm continuous gradation, after washing, the mud content is 0.9%; the polycarboxylate superplasticizer has a solid content of 20%.

[0027] The color of freshly mixed concrete and hardened concrete is light white, the strength of 3 days is 25.4Mpa, the strength of 7 days is 36.2Mpa, and the strength of 28 days is 50.9Mpa.

Embodiment 3

[0029] Take 250kg of cement, 230kg of mineral powder, 20kg of silicon powder, 15kg of titanium dioxide, 760kg of machine-made sand, 1000kg of crushed stone, 5.2kg of polycarboxylate superplasticizer, add 150kg of water and mix.

[0030] Among them, the cement strength is 48Mpa; the mineral powder grade is S95 grade, the powder whiteness is ≥80%, and the specific surface area is 500m 2 / kg, flow ratio 121%; titanium dioxide is rutile R-930; machine-made sand is crushed from pebbles, the fineness modulus is 3.0, the gradation meets the sand edge requirements in Zone II, and the stone powder content is 10%; The gravel is 5-25mm continuous gradation, after washing, the mud content is 0.73%; the polycarboxylate superplasticizer has a solid content of 20%.

[0031] The color of freshly mixed concrete and hardened concrete is light white, the strength of 3 days is 35.5Mpa, the strength of 7 days is 49.6Mpa, and the strength of 28 days is 72.8Mpa.

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Abstract

The invention relates to a machine-made sand and clear water concrete mixture, which pertains to the field of novel concrete materials. The clear water concrete mixture is made from 100 parts of cement, 65-150 parts of mineral powder, 0-10 parts of silicon powder, 1.7-2.6 parts of a polycarboxylic acid water reducing agent, 330-530 parts of crushed stone and 250-410 parts of machine-made sand; in order to cause the colors of the fresh mixed concrete and hardened concrete to reach different degrees of light white, the mixture can be further added with 0-6 parts of titanium dioxide. The concrete mixture is entirely made from the machine-made sand, which is helpful to save natural resource, and the concrete has good workability and water retention property.

Description

technical field [0001] The invention relates to a concrete mixture used for industrial and civil buildings, in particular to a machine-made sand fair-faced concrete mixture, which belongs to the field of new concrete materials. Background technique [0002] Fair-faced concrete refers to the concrete that directly uses the natural texture effect after concrete molding as a decorative effect. In recent years, this concrete has been widely used in large public buildings and major public facilities. With the large-scale promotion and application of fair-faced concrete projects in China, people's requirements for the apparent color of fair-faced concrete are becoming more and more diverse. Proposed and obtained experimental research. [0003] Machine-made sand has been widely used in ordinary concrete in recent years, but due to its poor gradation and particle shape, it is easy to cause bleeding and segregation of freshly mixed concrete. If it is used to mix fair-faced concrete ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/12C04B14/06
CPCC04B28/02
Inventor 高育欣任治平向卫平郑广军简晓军修晓明
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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