CN112441761A - Using method of surface weathered rock capable of saving river sand resources - Google Patents
Using method of surface weathered rock capable of saving river sand resources Download PDFInfo
- Publication number
- CN112441761A CN112441761A CN201910799376.6A CN201910799376A CN112441761A CN 112441761 A CN112441761 A CN 112441761A CN 201910799376 A CN201910799376 A CN 201910799376A CN 112441761 A CN112441761 A CN 112441761A
- Authority
- CN
- China
- Prior art keywords
- weathered rock
- cao
- substance
- casio
- river sand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Limestone CaCO in nature3Is easy to obtain, can form CaO after high-temperature calcination, and well overcomes the defect by doping a certain proportion of CaO. The method utilizes the reaction of CaO and water at normal temperature to generate alkalescent substance Ca (HCO)3)2The weak alkali substance and SiO which is the main substance in the surface weathered rock2Reaction to finally generate a neutral substance CaSiO3According to the method, weathered rocks are used for replacing river sand, impurities which are easy to generate unstable factors in the weathered rocks on the surface layer are removed, the cost of a pavement structure layer is reduced, and the ecological environment is protected. According to the reaction principle: CaO + SiO2=CaSiO3CaO+H2O+2CO2=Ca(HCO3)2,Ca(HCO3)2+SiO2=CaSiO3+H2O+2CO2。
Description
Technical Field
The present invention belongs to the field of highway engineering material. The surface weathered rock is a natural material which is easy to obtain, is added into a cement stabilized macadam foundation of a pavement as a fine aggregate, is low in cost, but acid substances in the components of the surface weathered rock easily cause pavement cracks. .
Background
The cement stabilized macadam in the current common road base material is widely used, and river sand with better quality must be adopted in the proportion of the fine aggregate. River sand is obtained by deep excavation, has high water taking cost and limited resources, is easy to damage local ecological environment in the excavation process, and is indispensable as fine aggregate in a pavement base course.
Disclosure of Invention
The surface weathered rock is a natural material which is very easy to obtain, river sand which is difficult to obtain in a relatively obtaining mode and high in price is added with a certain formula, and the surface weathered rock is used in some engineering fields instead of the river sand. Chemical composition of surface weathered rock on hilly areas (east and middle mountains):
| SiO2 | Fe2O3 | FeO | Al2O3 | CaO | MgO | K2O | Na2O | P2O5 | others |
| 86.12 | 1.28 | 0.37 | 5.82 | 0.56 | 0.65 | 2.12 | 0.12 | 0.075 | 2.885 |
Limestone CaCO in nature3Is easy to obtain, can form CaO after high-temperature calcination, and well overcomes the defect by doping a certain proportion of CaO. The method utilizes the reaction of CaO and water at normal temperature to generate alkalescent substance Ca (HCO)3)2The weak alkali substance and SiO which is the main substance in the surface weathered rock2Reaction to finally generate a neutral substance CaSiO3According to the method, weathered rocks are used for replacing river sand, impurities which are easy to generate unstable factors in the weathered rocks on the surface layer are removed, the cost of a pavement structure layer is reduced, and the ecological environment is protected.
According to the reaction principle: CaO + SiO2= CaSiO3
CaO+H2O+2CO2= Ca(HCO3)2
Ca(HCO3)2+ SiO2= CaSiO3+ H2O+2CO2
The specific implementation mode is as follows:
The invention provides a method for preparing and doping surface weathered rock to replace river sand, which is characterized by comprising the following steps:
(1) solely using weathered rock on the surface of the ground in hilly areas (east and middle of Shandong);
(2) Calcium carbonate CaCO by forced sintering3(limestone) CaO,
(3) According to the using amount of the surface weathered rock, adding the same amount of CaO and water in a quantity one third times of the surface weathered rock according to the mass ratio of 3:3:1, fully stirring and mixing the mixture for reaction, neutralizing acidic substances in the surface weathered rock, and mostly generating CaSiO3Neutral substance
(4) And according to the proportion of the fine aggregate in the cement stabilized macadam material of the pavement base, the mixture is added to completely replace river sand.
Claims (3)
1. The invention provides a method for preparing and adding surface weathered rock instead of river sand, which is characterized in that CaO reacts with water at normal temperature to generate alkalescent substance Ca (HCO)3)2The weak alkali substance and SiO which is the main substance in the surface weathered rock2Reaction to finally generate a neutral substance CaSiO3The method replaces the river sand with the weathered rock and removes impurities which are easy to generate unstable factors in the weathered rock on the surface layer.
2. The surface weathered rock of the ground in the hilly area (middle east of Shandong) is simply adopted.
3. According to the using amount of the surface weathered rock, the same amount of CaO and one-third of the amount of water are added according to the mass ratio of 3:3:1, the mixture is fully stirred, mixed and reacted, acidic substances in the surface weathered rock are neutralized, and most CaSiO is generated3A neutral substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910799376.6A CN112441761A (en) | 2019-08-28 | 2019-08-28 | Using method of surface weathered rock capable of saving river sand resources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910799376.6A CN112441761A (en) | 2019-08-28 | 2019-08-28 | Using method of surface weathered rock capable of saving river sand resources |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112441761A true CN112441761A (en) | 2021-03-05 |
Family
ID=74741825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910799376.6A Withdrawn CN112441761A (en) | 2019-08-28 | 2019-08-28 | Using method of surface weathered rock capable of saving river sand resources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112441761A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1392680A (en) * | 1972-06-02 | 1975-04-30 | Johns Manville | Method of producing shaped hydrated calcium silicate products |
| WO2010141976A1 (en) * | 2009-06-12 | 2010-12-16 | Polyrox Pty Ltd | Concrete aggregate |
-
2019
- 2019-08-28 CN CN201910799376.6A patent/CN112441761A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1392680A (en) * | 1972-06-02 | 1975-04-30 | Johns Manville | Method of producing shaped hydrated calcium silicate products |
| WO2010141976A1 (en) * | 2009-06-12 | 2010-12-16 | Polyrox Pty Ltd | Concrete aggregate |
Non-Patent Citations (2)
| Title |
|---|
| 王生兵: "高速公路水泥稳定风化岩路床处治技术", 《科技资讯》 * |
| 陈花林: "石灰改良泥质粉砂岩路基填料的试验研究", 《铁道工程学报》 * |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210305 |