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Environment-friendly recycled fine sand

An environment-friendly, fine sand technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of not conforming to the habit of using ready-mixed mortar, coarse particle size, not good enough, etc.

Active Publication Date: 2013-06-19
上海德滨环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the machine-made sand is made by crushing the stone with a vertical impact crusher, that is, a sand making machine. This process "breaks" more and "grinds" less, so this kind of machine-made sand is more flake and needle-shaped. There are more coarse sand and less fine sand, so it is more suitable to be used as concrete, but it is not good enough as sand for mortar or sand for aerated concrete, and it is usually necessary to screen out fine sand for use, especially for machine sprayed mortar and thermal insulation mortar. Sand has high requirements on the spherical shape, uniformity and fineness of the particles
[0004] At present, the reclaimed sand from construction waste is also produced by the sand and gravel aggregate production line, and there are also the above problems, such as large soil content, and many broken particles of clay bricks, which do not meet the usage habits of ready-mixed mortar manufacturers. , and usually 0-5mm reclaimed sand, the particle size is relatively coarse and contains a small amount of sawdust and other sundries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1, the preparation of environment-friendly regenerated fine sand

[0046] Prepare environment-friendly regenerated fine sand of the present invention according to the following steps:

[0047] A. Dispose of construction waste through pretreatment equipment to obtain materials with a particle size of 5mm≤particle size≤50mm;

[0048] Specifically, the construction waste is first roughly crushed, and the construction waste is roughly crushed to a material with a particle size of about 100mm by using crushing equipment (jaw crushing, impact crushing, roller crushing or hammer crushing); then the plastic, fabric, wood and the like in the construction waste are Light combustibles are sorted and removed manually or mechanically; then crushing equipment (impact crushing or coarse hammer crushing) is used to achieve medium crushing of construction waste coarse materials; at the same time, due to the low strength of the soil in construction waste, the high-speed rotati...

Embodiment 2

[0053] Example 2 , Environmentally friendly recycled fine sand detection

[0054] As shown in Table 1, take 2000 g of fine sand with a size of 80 μmm≤particle size≤1000 μm in Example 1, and use a negative pressure sieve analyzer to screen with square hole sieves with different apertures, and measure the weight percentage of the cumulative sieve residue.

[0055] Table 1

[0056]

[0057] Referring to the test method in "GBT 25176-2010 Recycled Fine Aggregate for Concrete and Mortar", various properties of fine sand were measured, and the results are shown in Table 2:

[0058] Table 2

[0059] project

[0060] alkali aggregate reaction

[0061] From the results in Table 2, it can be seen that the environment-friendly recycled fine sand of the present invention meets the standard of "Recycled Fine Aggregate for Concrete and Mortar" (GBT 25176-2010) after testing.

Embodiment 3

[0062] Example 3 , Application of environment-friendly recycled fine sand

[0063] According to the formula shown in table 3, the environment-friendly regenerated fine sand of the present invention is normally produced masonry mortar according to normal ready-mixed mortar (or dry mortar or wet mortar).

[0064] table 3

[0065]

[0066] Take the mortar in Table 3, add appropriate amount of water to the standard consistency of 90mm, and test according to "GBT 25176-2010 Recycled Fine Aggregate for Concrete and Mortar". The results are shown in Table 4:

[0067] Table 4

[0068]

control

1#

2#

Consistency (mm)

92

89

88

28-day compressive strength (MPa)

15.9

13.2

11.2

[0069] As can be seen from Table 4, the environment-friendly regenerated fine sand of the present invention can partially or completely replace natural sand, and can produce masonry mortar that meets the label requirements.

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Abstract

The invention discloses an environment-friendly recycled fine sand, wherein the fine sand is a building waste recycled aggregate having a particle size of not less than 80 mumm and not greater than 1000 mum. The invention further discloses a preparation method and an application for the environment-friendly recycled fine sand disclosed by the invention. The environment-friendly recycled fine sand disclosed by the invention meets the related national standards, and is convenient to use; the needs of mechanically-jetted mortar, heat-insulating mortar, thin-type masonry mortar, aerated concrete and the like are met; and resource comprehensive utilization, fine utilization and high-added-value utilization are realized.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an environmentally friendly regenerated fine sand and its preparation method and application. Background technique [0002] Aggregate, also known as aggregate, is divided into fine aggregate and coarse aggregate. Fine aggregate (also known as construction sand) is the second largest building raw material in demand other than coarse aggregate stones. my country's annual output of 2.5 billion cubic concrete, 600 million cubic mortar, and 1 billion cubic wall materials requires a total of about 1 billion cubic About 2 billion tons of construction sand. [0003] Due to the large-scale construction in our country, the river sand resources in many cities are increasingly exhausted, and the unrestricted mining will destroy the ecological environment. Replacing natural sand with machine-made sand is one of the ways to solve the supply of construction sand in our country. At present, mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 杨德志徐东升朱伟良刘琼陆沈磊王晓波董杨
Owner 上海德滨环保科技有限公司
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