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Base material containing fresh semi-hydrated ardealite, quick lime and coal ash for pavement

A technology of pavement base material and hemihydrate phosphogypsum is applied in the field of road materials to achieve the effect of reducing costs and saving resources

Active Publication Date: 2014-05-07
GUIZHOU CHANHEN CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no report on the application of fresh phosphogypsum hemihydrate in the pavement base, and dihydrate phosphogypsum is used in the pavement base material

Method used

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  • Base material containing fresh semi-hydrated ardealite, quick lime and coal ash for pavement
  • Base material containing fresh semi-hydrated ardealite, quick lime and coal ash for pavement
  • Base material containing fresh semi-hydrated ardealite, quick lime and coal ash for pavement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Fresh phosphogypsum hemihydrate-quicklime-red fly ash system pavement base: weigh hemihydrate phosphogypsum, quicklime, and red fly ash according to the design components in Table 1, and conduct a compaction test to determine the best mixture. Moisture content and maximum dry density, according to the controlled degree of compaction to form the test piece and measure its unconfined compressive strength, according to the degree of compaction of 95% to conduct the unconfined compressive strength test, the 7d (6d for health, 1d for immersion) ) The specific results of unconfined compressive strength are shown in Table 1.

[0043] Table 1 Performance indicators of phosphogypsum hemihydrate fly ash (red fly ash) pavement base

[0044]

[0045] From the performance indicators in Table 1, it can be seen that when the dosage of phosphogypsum hemihydrate is changed, its strength increases first and then decreases with the increase of the dosage of phosphogypsum hemihydrate. W...

Embodiment 2

[0047] Hemihydrate phosphogypsum-quicklime-brown fly ash system pavement base: Weigh hemihydrate phosphogypsum, quicklime, and brown fly ash according to the design components in Table 2, and conduct a compaction test to determine the optimum water content of the mixture Ratio and maximum dry density, according to the controlled degree of compaction molding test pieces and determine its unconfined compressive strength. The particle size of brown fly ash is less than or equal to 0.6mm. Change the dosage of phosphogypsum hemihydrate, and carry out the unconfined compressive strength test according to the compaction degree of 95%. The specific results of compressive strength are shown in Table 2.

[0048] Table 2 Performance indicators of phosphogypsum hemihydrate fly ash (brown fly ash) pavement base

[0049]

[0050] From the performance indicators in Table 2, it can be seen that when the content of phosphogypsum hemihydrate is changed, its strength shows a decreasing trend...

Embodiment 3

[0052] Water stability of phosphogypsum hemihydrate lime ash pavement base: in order to consume hemihydrate phosphogypsum to the greatest extent, on the basis of the research of embodiment 1 and embodiment 2, the consumption of hemihydrate phosphogypsum is the largest and meets the requirements of pavement base The composition design is used to test the water stability performance; the test pieces are formed according to the compaction degree of 95%, and the water stability tests are carried out for 7d and 28d respectively. The test results are shown in Table 3 and figure 2 .

[0053] Table 3 Water stability of phosphogypsum fly ash (red fly ash) pavement base

[0054]

[0055] From Table 3 and figure 2 It can be seen that with the extension of water soaking time, the strength of hemihydrate phosphogypsum-fly ash base layer decreases, and its strength loss rate is 28% compared with the base layer without water soaking for 4 days after wet curing for 3 days, and compared...

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Abstract

The invention discloses a base material containing fresh semi-hydrated ardealite, quick lime and coal ash for pavement, which can improve the unconfined compression strength of a pavement foundation. The base material belongs to the field of road materials. The base material comprises the following components in percentage by weight: 20-85% of fresh semi-hydrated ardealite, 3-10% of quick lime and 10-75% of red coal ash or brown coal ash. The base material provided by the invention is a semi-rigid pavement base with excellent performance; the used raw materials are mainly industrial side products; when the base material is used as a road material, the difficultly-utilized industrial side products such as the semi-hydrated ardealite can be greatly consumed and utilized, the stockpiled land can be saved, and the cost can be reduced; and the base material is beneficial to protecting natural resources and environments, the construction process is simple and reliable and is suitable for building of bases and subbases of common roads and high-grade roads.

Description

technical field [0001] The invention belongs to the field of road materials, and in particular relates to a fresh hemihydrate phosphogypsum-lime ash pavement base material which can improve the unconfined compressive strength of pavement foundations. Background technique [0002] With the sustained and rapid growth of my country's economy, the discharge of industrial solid waste has also increased simultaneously. Although the utilization of industrial solid waste is showing a steady growth trend, the utilization rate is still very low, and it is mainly concentrated on several industrial solid wastes that can be directly used in large quantities in the field of building materials, such as granulated blast furnace slag, dry exhaust powder Coal ash, etc., the current utilization rate of most industrial solid waste is still very low. Such as phosphogypsum hemihydrate, phosphogypsum is the most discharged waste in chemical gypsum. Factories that produce phosphoric acid, phosphat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/08
CPCY02W30/91
Inventor 王佳才赵青林刘兴良刘次啟李剑秋王迪姬鹏山
Owner GUIZHOU CHANHEN CHEM CO LTD
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