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Building waste clay brick burn-free light-weight aggregate and preparation method of same

A technology of construction waste and clay bricks, which is applied in the field of building materials, can solve the problems of unsuitable large-scale use, slow activity, high crushing index, etc., and achieve the effects of saving precious land, simple process, and energy saving

Inactive Publication Date: 2018-06-01
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waste clay bricks are crushed to produce recycled aggregates. Due to their high water absorption and crushing index, the prepared concrete has poor mechanical properties and durability, which severely limits its application in concrete.
The chemical composition of waste clay brick powder is similar to fly ash, but its activity is slow, so it is not suitable to be used in large quantities in concrete

Method used

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  • Building waste clay brick burn-free light-weight aggregate and preparation method of same
  • Building waste clay brick burn-free light-weight aggregate and preparation method of same
  • Building waste clay brick burn-free light-weight aggregate and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A construction waste clay brick non-burning lightweight aggregate comprises 85 parts of construction waste clay bricks, 11 parts of high alumina cement clinker, 3 parts of limestone and 1 part of anhydrite. The high-alumina cement clinker is first crushed in a 400x600mm crusher, and then fed into a Φ1.5x6.5m ball mill for mixing and grinding. The fineness of the mixture is 0.075mm and the residual amount of the square hole sieve is 4.5%. Use Φ2.5m ball discs to form balls, the inclination of the ball discs is 60 degrees, the amount of water added is 25.5%, the particle size is 5-20mm, and the natural temperature is 20-25 degrees, and the humidity is 70-80%. Cured into light aggregates. The cylinder compressive strength is 4.0MPa in 3 days, 7.5-8.5MPa in 28 days, and the bulk density is 600-750kg / m 3 The hourly water absorption rate is less than 30%, the natural state is less than 12%, the softening coefficient is greater than 0.75 (natural state 0.85), the antifreeze t...

Embodiment 2

[0020] A construction waste clay brick non-burning lightweight aggregate, using 80 parts of construction waste clay bricks, 14 parts of high alumina cement clinker, 4 parts of limestone and 3 parts of anhydrite, the fineness of the mixture is 0.075mm square hole sieve The balance is 3.0%. Add 24.5% water when forming into balls, and cure them into lightweight aggregates at a natural temperature of 30 degrees and a humidity of 95%. The cylinder compressive strength is 4.9MPa in 7 days and 8.2MPa in 28 days, and other properties are the same as in Example 1.

Embodiment 3

[0022] A construction waste clay brick non-fired lightweight aggregate, using 75% of construction waste clay bricks, 17% of high alumina cement clinker, 5% of limestone, 3% of anhydrite, and the fineness of the mixture is 0.075mm square hole sieve The balance is 4.0%. When forming balls, add 23.5% water, and maintain green aggregates at a natural temperature of 26 degrees and a humidity of 90%. The cylinder compressive strength is 4.7MPa in 7 days, 6.3MPa in 14 days, and 8.4MPa in 28 days. Other performances are the same as in Example 1.

[0023] In the present invention, high-alumina cement clinker is used as an activator, which has a strong stimulating effect on the activity of construction waste clay bricks. The lightweight aggregate prepared with high-alumina cement clinker not only has high early strength, but when an appropriate amount of limestone and After anhydrite, the late strength of lightweight aggregate is significantly improved, and a large amount of constructi...

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Abstract

The invention discloses a building waste clay brick burn-free light-weight aggregate which is composed of, by weight, 75-85 parts of building waste clay brick, 11-17 parts of high-aluminum cement clinker, 3-5 parts of limestone, and 1-3 parts of hard gypsum, wherein the high-aluminum cement clinker is prepared by calcining limestone, alumina and fluorite in a rotary kiln at 1100-1350 DEG C, the weight ratio of limestone, alumina to fluorite being 38:62:1-2. In the invention, the high-aluminum cement clinker is used as an activating agent for the building waste clay brick, so that valuable landresource occupied by disposal of the building wastes is saved, and the wastes are turned into resources; by means of the limestone and hard gypsum, the light-weight aggregate is low in volume-weightand high in strength. The light-weight aggregate only needs maintenance under natural environment, is simple in production process, can save energy resources and is green and environment-friendly.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a construction waste clay brick unfired lightweight aggregate and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization process. The construction industry produces a huge amount of construction waste every year. In 2016, my country's construction waste has reached 2 billion tons. Because my country's buildings before 30 years were mainly brick and wood structures, clay bricks account for 40-60% of the waste generated by the demolition of buildings in my country at this stage. Waste clay bricks are crushed to produce recycled aggregates. Due to their high water absorption and crushing index, the prepared concrete has poor mechanical properties and durability, which severely limits its application in concrete. The chemical composition of waste clay brick powder is similar to that of fly...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B18/16
CPCC04B18/16C04B28/06C04B2201/20C04B2201/50C04B14/28C04B22/143Y02W30/91
Inventor 寇世聪邢锋
Owner SHENZHEN UNIV
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