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Artificial macadam for road construction and preparation method thereof

A kind of artificial and road technology, applied in the field of artificial gravel for road construction and its preparation, can solve the problems of unstable sources of construction waste, complex and changeable components, and substandard compressive strength, so as to avoid environmental and safety hazards, The effect of reducing consumption and simplifying the manufacturing process

Active Publication Date: 2021-01-22
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are also some construction wastes that are used for road construction, maintenance and repair after treatment. However, due to the unstable source of construction waste and the complex and changeable components, it will lead to problems such as substandard compressive strength.

Method used

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  • Artificial macadam for road construction and preparation method thereof

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preparation example Construction

[0027] The invention provides a method for preparing artificial gravel for road construction, comprising:

[0028] Mix fly ash, cement, sand, water and water reducer to get mortar;

[0029] forming said mortar into blocks;

[0030] The blocks are cured and crushed to obtain artificial crushed stones for road construction.

[0031] In the present invention, the fly ash is preferably high-calcium fly ash produced by a circulating fluidized bed coal-fired power generation enterprise, and the fineness of the high-calcium fly ash is preferably ≤30%; The mass fraction of free calcium oxide (f-CaO) in the ash is preferably 0.5-10%, more preferably 1-8%, most preferably 3-6%.

[0032] In the present invention, the fly ash preferably also includes before using:

[0033] The fly ash is carried out pre-curing, and the method for the pre-curing preferably includes:

[0034] Place the fly ash after spraying it with water;

[0035] The temperature for placing is 20-60°C;

[0036] The ...

Embodiment 1

[0054] The high-calcium fly ash with a fineness of 10% and a mass fraction of f-CaO of 5% is selected as a raw material;

[0055] Remove impurities from the high-calcium fly ash, spray water on the surface, and maintain at room temperature (about 25°C) and 60% RH for 48 hours;

[0056] Put 100Kg of 42.5 grade ordinary Portland cement, 50Kg of standard sand, 200Kg of high-calcium fly ash after the above treatment, 40kg of water and 1.2kg of polycarboxylate superplasticizer into a mortar mixer and stir evenly to obtain mortar;

[0057] The mortar is made into a mortar block with a size of 300mm*120mm*100mm by a block forming machine, the vibration pressure during the preparation process is 0.5MPa, the amplitude is 5±1mm, the frequency is 50Hz, and the molding time is 30s;

[0058] After placing the mortar block in the natural environment for 28 days, adopt the GB / T17671-1999 "Cement Mortar Strength Test" method to detect the compressive strength of the cured mortar block obtaine...

Embodiment 2

[0061] The fineness is 10%, and the high-calcium fly ash with f-CaO mass fraction of 8% is selected as raw material;

[0062] Remove impurities from the high-calcium fly ash, spray water on the surface, and place it in an environment of about 40°C and 90% RH for 48 hours of maintenance;

[0063] Put 100Kg of 42.5 grade ordinary Portland cement, 50Kg of standard sand, 200Kg of high-calcium fly ash after the above treatment, 40kg of water and 1.2kg of polycarboxylate superplasticizer into a mortar mixer and stir evenly to obtain mortar;

[0064] The mortar is made into a mortar block with a size of 300mm*120mm*100mm by a block forming machine, the vibration pressure during the preparation process is 0.5MPa, the amplitude is 5±1mm, the frequency is 50Hz, and the molding time is 30s;

[0065] After the mortar block is placed in the natural environment for curing for 28 days, the cured mortar block is crushed by a jaw crusher to obtain artificial gravel with a particle size of 5-35...

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Abstract

The invention provides a preparation method of artificial macadam for road construction, which comprises the following steps: mixing fly ash, cement, sand, water and a water reducing agent to obtain mortar; making the mortar into a block body; and maintaining and crushing the block body to obtain the artificial macadam for road construction. The artificial macadam provided by the invention is simple in manufacturing process, the high-calcium fly ash of a circulating fluidized bed coal-fired power generation enterprise can be fully utilized, and the engineering cost is greatly reduced while thecomprehensive utilization of the high-calcium fly ash is promoted. According to the invention, different fly ash, cement and sand are compounded, the compressive strength of the prepared mortar blockreaches 20-45MPa after maintenance, and then the mortar block is crushed to obtain artificial macadams with different particle sizes. The invention further provides the artificial macadam for road construction.

Description

technical field [0001] The invention belongs to the technical field of road construction, and in particular relates to an artificial gravel used for road construction and a preparation method thereof. Background technique [0002] In the process of road construction, the cement-stabilized macadam base has strong integrity and high rigidity, which reduces the bending and tensile stress on the clear surface layer, and has a strong anti-fatigue ability on the vehicle, so it is widely used. In recent years, the consumption of sand and gravel aggregates in my country has been increasing year by year, and the resources of high-quality stones are decreasing day by day. The stones of substandard quality cause the cement-stabilized crushed stone base to crack easily, posing safety hazards. In the past, natural crushed stones derived from mining were mainly used. With the gradual depletion of natural crushed stones, the improvement of ecological protection requirements and the continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/02
CPCC04B28/04C04B18/021C04B2201/50C04B2111/0075C04B18/08C04B14/06C04B2103/302
Inventor 魏雅娟王群英陈仕国宋明光
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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