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Agglomerated rock pavior brick with pervious function and preparation thereof

A technology of pavement bricks and congealed stones, which is applied in the field of building materials, can solve the problems of poor freeze-thaw resistance, difficulty in water penetration and service life, etc., achieve low manufacturing energy consumption, avoid poor freeze-thaw resistance, and protect the environment.

Inactive Publication Date: 2009-05-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention relies on the hydraulic activity of steel slag aggregates to greatly improve the freeze-thaw resistance of cement-based pavement permeable bricks, since Portland cement is a high-calcium system, C-S-H gel is the main cement phase, and due to excess Ca(OH) 2 It is often concentrated at the boundary between the cementitious material and the aggregate, forming a weak interface, so it is difficult to fundamentally overcome the problem of poor freeze-thaw resistance
In addition, since Ca(OH) 2 It will be slowly filtered out by the leaching of rainwater, and due to carbonization and other reasons, it is difficult to ensure that the cement-based pavement permeable switch has a long service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the bottom layer of raw materials, in terms of weight percentage, aggregate accounts for 75%, stone cementing material accounts for 18.5%, water reducing agent accounts for 2.0%, and water accounts for 4.5%; in the upper layer raw materials, aggregates account for 73%, and stone accounts for 21%. , Water reducing agent accounts for 0.8%, water accounts for 5.2%.

[0020] The aggregate mentioned above is limestone crushed stone with a particle size of 3-10mm, and the crushing index value of the aggregate is 15; the cementitious material uses ordinary cement with a strength grade of 42.5; the water-reducing agent is commonly used in the concrete field For UNF-5 water reducing agent, ordinary tap water is used for mixing.

[0021] Using manual molding, the specific production operation steps are as follows:

[0022] (1) Use sieves with apertures of 10mm and 3mm in advance to select aggregate particles with a particle size of 3-10mm. Weigh the raw materials of the bottom lay...

Embodiment 2

[0030] In the bottom layer raw materials, in terms of weight percentages, aggregates account for 77.5%, stone cementing materials account for 16.5%, water reducing agents account for 1.0%, and water account for 5.0%; in the upper layer raw materials, aggregates account for 73%, and stone accounts for 20.3% , Water reducing agent accounts for 0.7%, water accounts for 6.0%.

[0031] The aggregate mentioned above is steel slag with a particle size of 3-10mm. The aggregate crush index value is 30. The above-mentioned conglomerate adopts ordinary conglomerate with a strength grade of 42.5 or / and 52.5. The above-mentioned water reducing agent is a wood-calcium superplasticizer commonly used in the field of concrete, and the above-mentioned water is groundwater that can be used as an application water source.

[0032] The specific production operation steps of the production of condensate permeable pavement bricks using manual molding are as follows:

[0033] (1) Use sieves with aperture...

Embodiment 3

[0041] In the bottom layer of raw materials, in terms of weight percentage, aggregate accounts for 76%, stone cementing material accounts for 18.5%, water reducing agent accounts for 2.0%, and water accounts for 3.5%; in the upper layer raw materials, aggregates account for 73.5%, and stone accounts for 22.1%. , Water reducing agent accounted for 0.9%, water accounted for 3.5%.

[0042] The above-mentioned aggregate is coarse mountain sand with a particle size of 3-10mm. The aggregate crush index value is 15. Conglomerate cementitious material adopts ordinary conglomerate with a strength grade of 42.5. Water reducer is a polycarboxylic acid superplasticizer commonly used in the concrete field, and seawater is used as the water.

[0043] The production of condensed stone permeable pavement bricks is formed by a brick press with vibration function. The specific production steps are as follows: Prepare the base material and the upper material according to the same method as the above...

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Abstract

The invention belongs to the field of building materials, and in particular relates to an agglomerated rock paving brick with function of water permeability, which is characterized in that agglomerated rocks are used as a gelled material to give full play to the characteristics of no free Ca(OH)2 contained therein after hardening, strong freeze-thawing resistance, good durability and the like of the novel silicon-aluminum based gelled material. The production of the agglomerated rock paving water permeable brick is divided into an upper layer and a lower layer for material blending and forming. The brick can be formed manually or mechanically. The underlayer raw material comprises the following components by weight percentage: 75 to 78 percent of aggregate, 16.5 to 18.5 percent of agglomerated rock gelled material, 0.5 to 2.0 percent of water reducing agent, and 3.5 to 6.0 percent of water; and the upper layer raw material comprises: 71 to 75 percent of the aggregate, 20.8 to 22.1 percent of the agglomerated rock, 0.7 to 0.9 percent of the water reducing agent, and 3.5 to 6.0 percent of water. Compared with ceramic paving water permeable brick, the agglomerated rock paving brick can considerably reduce the cost of the paving water permeable bricks, and calcination is not needed at the same time for energy conservation and environmental protection. Compared with the prior cement-based paving water permeable brick, the agglomerated rock paving brick overcomes the defects of poor freeze-thawing resistance and short service life.

Description

Technical field [0001] The invention belongs to the field of building materials, and particularly relates to a concrete pavement brick with water-permeable function and a preparation method thereof. Background technique [0002] Currently, there are three main types of pavement permeable bricks: ceramic-based, cement-based, and resin-based. Among them, the production cost of ceramic-based pavement permeable bricks and resin-based pavement permeable bricks is too high, and it is currently difficult to promote them on a large scale. Among them, resin-based pavement water-permeable bricks also have the problem of aging and environmental pollution by ultraviolet radiation. At present, the permeable bricks for cement-based pavement cannot completely overcome the problem of excessive strength drop after freezing and thawing, resulting in short service life. The patent with publication number CN1186291C discloses the use of ordinary Portland cement and resin composite as the cementing m...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/14C04B14/06
CPCY02W30/91
Inventor 倪文孙恒虎张旭芳张玉燕郑永超
Owner UNIV OF SCI & TECH BEIJING
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