CN105884281A - High-ductility fiber cement impervious wall prepared from tailing sand and preparation method of high-ductility fiber cement impervious wall - Google Patents
High-ductility fiber cement impervious wall prepared from tailing sand and preparation method of high-ductility fiber cement impervious wall Download PDFInfo
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- CN105884281A CN105884281A CN201610241874.5A CN201610241874A CN105884281A CN 105884281 A CN105884281 A CN 105884281A CN 201610241874 A CN201610241874 A CN 201610241874A CN 105884281 A CN105884281 A CN 105884281A
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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a high-ductility fiber cement impervious wall prepared from tailing sand. A casting material of the impervious wall is high-ductility cement paste, and the high-ductility cement paste comprises components in percentage by mass as follows: 10%-24% of cement, 20%-25% of the tailing sand, 35%-55% of fly ash, 5%-16% of water, 0.2%-0.5% of a water reducing agent, 2%-3% of magnesium oxide and PVA (polyvinyl alcohol) fibers, wherein the volume fraction of the PVA fibers is 1%-2% of the total volume of the high-ductility cement paste. The impervious wall is made of the casting material containing the tailing sand, the tailing sand is greatly utilized, the waste is changed into wealth, and the casting material has high ductility.
Description
Technical field
The present invention relates to a kind of cement anti-seepage wall, specifically, relate to a kind of utilizing prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall and preparation method.
Background technology
China is a mining powers.According to statistics, generation mine tailing total amount in China mine surpasses 56.2 hundred million tons.Fraction mine tailing is stored in Tailings Dam directly as filling in mine or comprehensive recycling, the equal heap of remainder.Incomplete statistics, China's Tailings Dam has more than 12655 seats, and increases with the scale of more than 300 every year.Tailings Dam directly exposes and can directly contribute environmental pollution, and mainly performance is such as: some mine tailing directly carries the polluter that exceeds standard, such as radioelement and other harmful constituent；Dressing Production Process use chemical agent remain in mine tailing and with some of which component reaction, produce new polluter；Naturally under the conditions of exposureization, mine tailing aoxidizes, hydrolyze and the changing of table such as air slaking, and making free of contamination constitutional changes originally is pollution components, some heavy sulfide commonly existed such as nonferrous metal mine；Enter the moisture in the Tailings Slurry of Tailings Dam and descend environment seepage, polluted underground water system peripherally；In Tailings Dam, mud moisture is to groundwater infiltration, the surface water that flows through Tailings Dam, by interacting with mine tailing, dissolves some harmful constituent and carries transfer, causing large-scale pollution；Tailings Dam accident is revealed and is directly resulted in Tailings Slurry pollution surrounding.
Tailings Dam is also titanic peril source simultaneously.Such as Xiangfen, Shanxi Province in 2008 tailing dam dam-break accident, loss mine tailing 26.8 ten thousand m3, length of flow across reaches 2 km, crosses mud area and reaches 300,000 m2, cause the environmental pollution that 278 people are dead and serious.Shanghang, Fujian county Zijin Mining generation highly acid percolate incident of leakage in 2010,9100m3Percolate flow into Ting Jiang along the culvert that drains off floodwaters, cause Ting Jiang part section to be polluted and a large amount of fish kills.
One of major issue having become in mine environment Geotechnical Engineering is disposed in the process of tailings mud.Tailings Dam contains high concentration heavy metal compound in the contaminated liquid that rainwater leaching goes out.Each Tailings Dam is all a potential concentrated contaminated water source, the periphery soil body and subsoil water may be caused serious pollution.Tailings Dam need to set up horizontally or vertically seepage control system, its many employing grouting curtains or concrete continuous wall, slurry material is mainly cement mortar, clay slurry or cement, clay mixing slurry or chemical pulp etc., to form water-stop curtain or sealing partition wall, deaden Tailings Dam internal contamination liquid to circumferentially descending environment seepage to spread.
The feature that acid tailing waste liquid has highly acid (pH is less than 2.5), sulfate concentration is high, chlorine ion concentration is high, it is containing other heavy metal metal ions multiple.Therefore its engineering barrier is desirable to reach long-term body of wall integrity, shock resistance, hypotonicity, chemical compatibility.
The fiber reinforced cement-based composite material of high ductility is the novel civil engineering material of one with pseudo-strain hardening characteristic and multiple crack growth feature based on Micromechanics principle optimization design.Wherein vinal volume volume is generally at about 2-3%, and its stretching strain is the hundred times of normal concrete.In actual body of wall process of construction, body of wall needs to harden timely, but the curing time of ordinary cement based composites is the most oversize, and the impact on engineering is bigger.
Summary of the invention
Technical problem:It is an object of the invention to provide and a kind of utilize prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall and preparation method, this cut-pff wall utilizes the mould material containing CHARACTERISTICS OF TAILINGS SAND to make, make use of CHARACTERISTICS OF TAILINGS SAND greatly, turn waste into wealth, and this mould material has high ductility.
Technical scheme:For achieving the above object, the technical scheme that the embodiment of the present invention uses is as follows:
A kind of utilizing prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, the material that pours of described cut-pff wall is high ductility cement mortar, and described high ductility cement mortar is according to mass percent, including following components:
Cement 10-24%,
CHARACTERISTICS OF TAILINGS SAND 20-25%,
Flyash 35-55%,
Water 5-16%,
Water reducer 0.2-0.5%,
Magnesium oxide 2-3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1-2% of high ductility cement mortar cumulative volume.
Preferably, the mass ratio of described cement, CHARACTERISTICS OF TAILINGS SAND, flyash, water, water reducer and magnesium oxide is: 15:
20:47.5:15:0.5:2。
Preferably, described cement is common #42.5 portland cement；The maximum particle diameter of described CHARACTERISTICS OF TAILINGS SAND is less than 0.5mm；Described flyash is 1 grade of flyash；Described magnesium oxide is light magnesium oxide；Described water reducer is poly-carboxylic type water reducer.
Preferably, described magnesium oxide be mass content be the technical grade light magnesium oxide of 70-88%.
Preferably, described CHARACTERISTICS OF TAILINGS SAND uses following methods infiltration flushing to be prepared from:
CHARACTERISTICS OF TAILINGS SAND is sieved through 35 mesh standard sieves；
Preparation infiltration rinse solution, containing the 0.5 1.0 pure acetic acid of mol, the edta solution of 0.1 0.2mmol, the sodium hydroxide powder of 0.5 0.8mol and the pure hydrochloric acid solution of 0.2 0.4mol in every liter of this solution；
The CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, forms solidliquid mixture；
Solidliquid mixture is filtered, and rinses with water, 100-105 degree Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Preferably, when described CHARACTERISTICS OF TAILINGS SAND is stirred with infiltration rinse solution, mixing speed is 30 turns/min, and mixing time is 20-24 hour；The pH value of described infiltration rinse solution is 1.32 3.55.
The embodiment of the present invention also provides for a kind of preparation method with high ductility fibre cement cut-pff wall utilizing CHARACTERISTICS OF TAILINGS SAND to prepare, and this preparation method comprises the following steps:
Prepare high ductility fibrous cement paste: cement, CHARACTERISTICS OF TAILINGS SAND, flyash mix are added the most afterwards water and carries out stirring for the first time；It is subsequently adding magnesium oxide, water and water reducer to carry out stirring for the second time；It is eventually adding PVA fiber and water carries out third time and stirs, obtain high ductility fibrous cement paste；
The high ductility fibrous cement paste made is poured into antiseepage position by placing installation, forms cut-pff wall.
Preferably, described high ductility cement mortar is according to mass percent, including following components:
Cement 10-24%,
CHARACTERISTICS OF TAILINGS SAND 20-25%,
Flyash 35-55%,
Water 5-16%,
Water reducer 0.2-0.5%,
Magnesium oxide 2-3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1-2% of high ductility cement mortar cumulative volume.
Preferably, described prepare high ductility fibrous cement paste during, the mass ratio of the water added in stirring for the first time, second time stirring and third time stirring is 15:
2:3。
Preferably, in described first time stirring, CHARACTERISTICS OF TAILINGS SAND processes through infiltration irrigation, and detailed process is:
CHARACTERISTICS OF TAILINGS SAND is sieved through 35 mesh standard sieves；
Preparation infiltration rinse solution, containing the 0.5 1.0 pure acetic acid of mol, the edta solution of 0.1 0.2mmol, the sodium hydroxide powder of 0.5 0.8mol and the pure hydrochloric acid solution of 0.2 0.4mol in every liter of this solution；
The CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, forms solidliquid mixture；
Solidliquid mixture is filtered, and rinses with water, 100-105 degree Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Beneficial effect:Compared with existing cement anti-seepage wall, the high ductility fibre cement cut-pff wall wall containing CHARACTERISTICS OF TAILINGS SAND of the embodiment of the present invention has the advantage that this cut-pff wall utilizes the mould material containing CHARACTERISTICS OF TAILINGS SAND to make, make use of CHARACTERISTICS OF TAILINGS SAND greatly, turn waste into wealth, and this mould material has high ductility.Use this material, intensity and the deformation performance of cement anti-seepage wall can be effectively improved, improve bearing capacity and the ductility of structure.
Accompanying drawing explanation
Fig. 1 is the corresponding relation figure of ECC materials for wall infiltration coefficient under tension crack state and cracking width.
Fig. 2 is CHARACTERISTICS OF TAILINGS SAND ECC and traditional cements materials for wall, under stretching condition, becomes the graph of a relation of row amount and hot strength.
Detailed description of the invention
Below the embodiment of the present invention is described in detail.
The embodiment of the present invention a kind of utilizes prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, and the material that pours of described cut-pff wall is high ductility cement mortar, and described high ductility cement mortar is according to mass percent, including following components:
Cement 10-24%,
CHARACTERISTICS OF TAILINGS SAND 20-25%,
Flyash 35-55%,
Water 5-16%,
Water reducer 0.2-0.5%,
Magnesium oxide 2-3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1-2% of high ductility cement mortar cumulative volume.
Due to the ductility of the materials for wall that conventional cement slurries is formed, form according to the cohesiveness between hydrolysis product of cement completely.And conventional fibre cement material Main Basis cement, flyash, quartz sand and fiber composition, high ductility derives from the bridge joint effect of cement product and fiber.After using CHARACTERISTICS OF TAILINGS SAND to substitute quartz sand in the embodiment of the present invention, the hydrated product in the core portion as hydrated product, beneficially cement and flyash is formed the frame structure within body of wall by CHARACTERISTICS OF TAILINGS SAND.CHARACTERISTICS OF TAILINGS SAND belongs to ore dressing garbage, and it contains the materials such as substantial amounts of silicon dioxide and calcium dioxide, it is possible to the kernel reacted sufficiently as cement and pulverized burned coal ash hydration, forms fine and close space structure with hydrated product hydrated calcium silicate.The calcium simultaneously contained inside CHARACTERISTICS OF TAILINGS SAND is higher than quartz sand, can more effectively provide the calcium required for hydration reaction and aluminum, and make full use of the bridge joint effect of PVA fiber, it is achieved ECC(English full name Engineered
Cementitious composite, Chinese translation high ductibility cement-base composite material) materials for wall strain hardening and high ductibility.Add PVA fiber and can realize ECC materials for wall strain hardening and high ductibility, be mostly derived from: 1) PVA fiber good dispersion in mortar, conglomeration when will not cause mix because fiber is meticulous or long；2) PVA fibre tensile strength and elastic modelling quantity are high, fully increase the tensile strength of material, correspondingly reduce the cracking of material, improve durability；3) there is the good compatibility with cement；4) good hydrophilic property, PVA fiber can be evenly dispersed in cement matrix.
The fibre cement cut-pff wall of the embodiment of the present invention, it is to be poured by the fibre cement containing CHARACTERISTICS OF TAILINGS SAND to form, make full use of the high intensity and high tenacity morning of high ductility fibre cement, improve non-deformability and the Penetration Signature of concrete cut, and then improve anti-seismic performance and the retardance pollutant ability of cut-pff wall.
In the above-described embodiments, as preferably, described cement is common #42.5 portland cement.The maximum particle diameter of described CHARACTERISTICS OF TAILINGS SAND is less than 0.5mm.Described flyash is 1 grade of flyash.Industrial will be divided into one-level, two grades and three grades by the flyash of 325 mesh.More than 88% flyash is first level flour coal ash by 325 purposes, and more than 70% flyash is second class powered coal ash by 325 purposes, and more than 55% flyash is three grades of flyash by 325 purposes.That is, flyash grade is relevant with its granularity, and first level flour coal ash particle is the thinnest.Described water reducer is poly-carboxylic type water reducer.Described magnesium oxide is light magnesium oxide.Be more highly preferred to, described magnesium oxide be mass content be the technical grade light magnesium oxide of 70-88%.Light magnesium oxide activity is high, compared with dead burned magnesia, can improve quick-hardening effect and the reaction effect with flyash.
A length of 6 10mm of PVA fiber, a diameter of 20 30um, tensile strength are more than 1200MPa, elastic modelling quantity is more than 30GPa.
In the above-described embodiments, CHARACTERISTICS OF TAILINGS SAND is the CHARACTERISTICS OF TAILINGS SAND processed through infiltration flushing.The purpose that infiltration flushing processes is the material of the suppression hydrated reaction of cement such as the heavy metal of removing CHARACTERISTICS OF TAILINGS SAND surface enrichment.Specifically, CHARACTERISTICS OF TAILINGS SAND uses following methods infiltration flushing to be prepared from:
CHARACTERISTICS OF TAILINGS SAND is sieved by step 10) through 35 mesh standard sieves.
Step 20) preparation infiltration rinse solution, containing the 0.5 1.0 pure acetic acid of mol, the edta solution of 0.1 0.2mmol, the sodium hydroxide powder of 0.5 0.8mol and the pure hydrochloric acid solution of 0.2 0.4mol in every liter of this solution；As preferably, it is 1.32 3.55 that molten pH value is rinsed in the infiltration of preparation.Regulation pH to 1.32 3.55, is of value to separating out and the use of EDTA of CHARACTERISTICS OF TAILINGS SAND surface heavy metal.
Step 30) CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, form solidliquid mixture.As preferably, mixing speed is 30 turns/min, and mixing time is 20-24 hour.
Step 40) solidliquid mixture is filtered, and rinse with water, 100-105 degree Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
In step 30) in, pure acetic acid and sodium hydroxide form the sodium acetate solution slowly discharging acid ion, pure hydrochloric acid can effectively regulate increase acid ion concentration, and forming pH is that the solution between 1.32 3.55 can effectively promote the heavy metal (such as lead, ferrum, zinc, copper etc.) of CHARACTERISTICS OF TAILINGS SAND surface enrichment to separate out.Concurrently there are EDTA(Chinese translation under sour environment is: ethylenediaminetetraacetic acid, and English full name is: Ethylenediaminetetraacetic acid), can be with the heavy metal generation complex reaction separated out.Step 30) can effectively prevent metal again to reunite on CHARACTERISTICS OF TAILINGS SAND surface.After immersion liquid rinses, the content of beary metal in CHARACTERISTICS OF TAILINGS SAND drastically reduces, and will not suppress hydrated reaction of cement, and then improve hydrated product, add the flocculating result of large cement, increase ductility and impermeability when being of value to it with cement mixing.
The preparation method of the cut-pff wall of above-described embodiment, comprises the following steps:
Prepare high ductility fibrous cement paste: cement, CHARACTERISTICS OF TAILINGS SAND, flyash mix are added the most afterwards water and carries out stirring for the first time；It is subsequently adding magnesium oxide, water and water reducer to carry out stirring for the second time；It is eventually adding PVA fiber and water carries out third time and stirs, obtain high ductility fibrous cement paste；
The high ductility fibrous cement paste made is poured into antiseepage position by placing installation, forms cut-pff wall.
In this embodiment, described high ductility cement mortar is according to mass percent, including following components:
Cement 10-24%,
CHARACTERISTICS OF TAILINGS SAND 20-25%,
Flyash 35-55%,
Water 5-16%,
Water reducer 0.2-0.5%,
Magnesium oxide 2-3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1-2% of high ductility cement mortar cumulative volume.
Preferably, described prepare high ductility fibrous cement paste during, the mass ratio of the water added in stirring for the first time, second time stirring and third time stirring is 15:
2:3.This ratio is suitable for stirring and cement mortar mixes.
In above-mentioned preparation method, in described first time stirring, CHARACTERISTICS OF TAILINGS SAND processes through infiltration irrigation, and detailed process is:
CHARACTERISTICS OF TAILINGS SAND is sieved by step 10) through 35 mesh standard sieves.
Step 20) preparation infiltration rinse solution, containing the 0.5 1.0 pure acetic acid of mol, the edta solution of 0.1 0.2mmol, the sodium hydroxide powder of 0.5 0.8mol and the pure hydrochloric acid solution of 0.2 0.4mol in every liter of this solution；As preferably, it is 1.32 3.55 that molten pH value is rinsed in the infiltration of preparation.
Step 30) CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, form solidliquid mixture.As preferably, mixing speed is 30 turns/min, and mixing time is 20-24 hour.
Step 40) solidliquid mixture is filtered, and rinse with water, 100-105 degree Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Below by the cut-pff wall of the verification experimental verification embodiment of the present invention, there is good high ductility and barrier performance.
Example
1
Prepare the process of cut-pff wall: prepare high ductility fibrous cement paste: cement, CHARACTERISTICS OF TAILINGS SAND, flyash mix are added the most afterwards water and carries out stirring for the first time；It is subsequently adding magnesium oxide, water and water reducer to carry out stirring for the second time；It is eventually adding PVA fiber and water carries out third time and stirs, obtain high ductility fibrous cement paste；The high ductility fibrous cement paste made is poured into antiseepage position by placing installation, forms cut-pff wall.The length of cut-pff wall, height, thickness are 5*3*05m.
In this example, described high ductility cement mortar is according to mass percent, including following components:
Cement 15%,
CHARACTERISTICS OF TAILINGS SAND 20%,
Flyash 46%,
Water 14%,
Water reducer 0.5%,
Magnesium oxide 2%.
The volume volume of PVA fiber is the 2% of high ductility cement mortar cumulative volume.
It addition, in this example, the processing procedure of CHARACTERISTICS OF TAILINGS SAND is:
CHARACTERISTICS OF TAILINGS SAND is sieved by step 10) through 35 mesh standard sieves.
Step 20) preparation infiltration rinse solution, containing 0.5 in every liter of this solution
The pure hydrochloric acid solution of the pure acetic acid of mol, the edta solution of 0.2mmol, the sodium hydroxide powder of 0.7mol and 0.3mol；As preferably, it is 2.15 that molten pH value is rinsed in the infiltration of preparation.
Step 30) CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, form solidliquid mixture.As preferably, mixing speed is 30 turns/min, and mixing time is 24 hours.
Step 40) solidliquid mixture is filtered, and rinse with water, 100 degrees Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Example
2
The process preparing cut-pff wall is identical with example 1, except that:
In this example, described high ductility cement mortar is according to mass percent, including following components:
Cement 10%,
CHARACTERISTICS OF TAILINGS SAND 21%,
Flyash 55%,
Water 9.6%,
Water reducer 0.2%,
Magnesium oxide 3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1% of high ductility cement mortar cumulative volume.
It addition, in this example, the processing procedure of CHARACTERISTICS OF TAILINGS SAND is:
CHARACTERISTICS OF TAILINGS SAND is sieved by step 10) through 35 mesh standard sieves.
Step 20) preparation infiltration rinse solution, containing 1.0 in every liter of this solution
The pure hydrochloric acid solution of the pure acetic acid of mol, the edta solution of 0.1mmol, the sodium hydroxide powder of 0.8mol and 0.2mol；As preferably, it is 1.32 that molten pH value is rinsed in the infiltration of preparation.
Step 30) CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, form solidliquid mixture.As preferably, mixing speed is 30 turns/min, and mixing time is 20 hours.
Step 40) solidliquid mixture is filtered, and rinse with water, 105 degrees Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Example
3
The process preparing cut-pff wall is identical with example 1, except that:
In this example, described high ductility cement mortar is according to mass percent, including following components:
Cement 24%,
CHARACTERISTICS OF TAILINGS SAND 20.5%,
Flyash 35%,
Water 16%,
Water reducer 0.4%,
Magnesium oxide 2.1%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 2% of high ductility cement mortar cumulative volume.
It addition, in this example, the processing procedure of CHARACTERISTICS OF TAILINGS SAND is:
CHARACTERISTICS OF TAILINGS SAND is sieved by step 10) through 35 mesh standard sieves.
Step 20) preparation infiltration rinse solution, containing 0.9 in every liter of this solution
The pure hydrochloric acid solution of the pure acetic acid of mol, the edta solution of 0.15mmol, the sodium hydroxide powder of 0.7mol and 0.25mol；As preferably, it is 3.55 that molten pH value is rinsed in the infiltration of preparation.
Step 30) CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, form solidliquid mixture.As preferably, mixing speed is 30 turns/min, and mixing time is 22 hours.
Step 40) solidliquid mixture is filtered, and rinse with water, 104 degrees Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Example
4
The process preparing cut-pff wall is identical with example 1, except that:
In this example, described high ductility cement mortar is according to mass percent, including following components:
Cement 15%,
CHARACTERISTICS OF TAILINGS SAND 25%,
Flyash 50.5%,
Water 5%,
Water reducer 0.5%,
Magnesium oxide 2.5%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1.5% of high ductility cement mortar cumulative volume.
It addition, in this example, the processing procedure of CHARACTERISTICS OF TAILINGS SAND is:
CHARACTERISTICS OF TAILINGS SAND is sieved by step 10) through 35 mesh standard sieves.
Step 20) preparation infiltration rinse solution, containing 0.8 in every liter of this solution
The pure hydrochloric acid solution of the pure acetic acid of mol, the edta solution of 0.18mmol, the sodium hydroxide powder of 0.5mol and 0.4mol；As preferably, it is 3.05 that molten pH value is rinsed in the infiltration of preparation.
Step 30) CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, form solidliquid mixture.As preferably, mixing speed is 30 turns/min, and mixing time is 21 hours.
Step 40) solidliquid mixture is filtered, and rinse with water, 103 degrees Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
Comparative example
1
Using existing cement material, its component includes cement, Sha Heshui, and according to mass ratio, cement: sand: water=1:1:0.5.
Experiment of seepage
Process of the test: the Standard for test methods of longterm performance and durability of ordinary concrete standard using state to be numbered GB-T50082-2009 is tested.
Result of the test is as shown in Figure 1.Seepage resistance demand (10 just can be reached when not ftractureing-9M/s)
As shown in Figure 1, utilize the most conventional ECC material of high extensibility of fibers cement anti-seepage wall infiltration coefficient of CHARACTERISTICS OF TAILINGS SAND, but when for cracking state, infiltration coefficient still meets permeation requirements.Along with the material mixture ratio of example 1 example 4 changes, having following Changing Pattern: under identical Cracking Condition, infiltration coefficient size is arranged as example 3 ＜ example 1 ＜ example 4 ＜ example 2.
High ductility test
Process of the test: the standard for test methods of mechanical properties of ordinary concrete using state to be numbered GB/T 50081-2002 is tested.
Result of the test is as shown in Figure 2.As shown in Figure 2, utilize the high extensibility of fibers cement anti-seepage wall tensile resistance of CHARACTERISTICS OF TAILINGS SAND apparently higher than traditional cements impervious material.This shows that the high extensibility of fibers cement anti-seepage wall utilizing CHARACTERISTICS OF TAILINGS SAND has higher tensile resistance.CHARACTERISTICS OF TAILINGS SAND ECC of the present embodiment still has high hot strength under high deformation condition, and traditional cements is in the case of increasing along with deflection, and strength retrogression is extremely serious.Along with the material mixture ratio of example 1 example 4 changes, there is following Changing Pattern: tensile resistance size is arranged as example 3 ＞ example 1 ＞ example 4 ＞ example 2 under same stretch Variable Conditions.
The ultimate principle of the present invention, principal character and advantage have more than been shown and described.Those skilled in the art it should be recognized that; the present invention is not limited by above-mentioned specific embodiment; description in above-mentioned specific embodiment and description is intended merely to further illustrate the principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.The scope of protection of present invention is defined by claims and equivalent thereof.
Claims (10)
1. one kind utilizes prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, it is characterised in that the material that pours of described cut-pff wall is high ductility cement mortar, and described high ductility cement mortar is according to mass percent, including following components:
Cement 10-24%,
CHARACTERISTICS OF TAILINGS SAND 20-25%,
Flyash 35-55%,
Water 5-16%,
Water reducer 0.2-0.5%,
Magnesium oxide 2-3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1-2% of high ductility cement mortar cumulative volume.
The most according to claim 1 utilize prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, it is characterised in that the mass ratio of described cement, CHARACTERISTICS OF TAILINGS SAND, flyash, water, water reducer and magnesium oxide is: 15:
20:47.5:15:0.5:2。
The most according to claim 1 utilize prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, it is characterised in that described cement is common #42.5 portland cement；The maximum particle diameter of described CHARACTERISTICS OF TAILINGS SAND is less than 0.5mm；Described flyash is 1 grade of flyash；Described magnesium oxide is light magnesium oxide；Described water reducer is poly-carboxylic type water reducer.
The most according to claim 3 utilize prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, it is characterised in that described magnesium oxide be mass content be the technical grade light magnesium oxide of 70-88%.
The most according to claim 1 utilize prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, it is characterised in that described CHARACTERISTICS OF TAILINGS SAND uses following methods infiltration flushing to be prepared from:
CHARACTERISTICS OF TAILINGS SAND is sieved through 35 mesh standard sieves；
Preparation infiltration rinse solution, containing the 0.5 1.0 pure acetic acid of mol, the edta solution of 0.1 0.2mmol, the sodium hydroxide powder of 0.5 0.8mol and the pure hydrochloric acid solution of 0.2 0.4mol in every liter of this solution；
The CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, forms solidliquid mixture；
Solidliquid mixture is filtered, and rinses with water, 100-105 degree Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
The most according to claim 5 utilize prepared by CHARACTERISTICS OF TAILINGS SAND to have high ductility fibre cement cut-pff wall, it is characterised in that when described CHARACTERISTICS OF TAILINGS SAND is stirred with infiltration rinse solution, mixing speed is 30 turns/min, and mixing time is 20-24 hour；The pH value of described infiltration rinse solution is 1.32 3.55.
7. the preparation method with high ductility fibre cement cut-pff wall utilizing CHARACTERISTICS OF TAILINGS SAND to prepare, it is characterised in that this preparation method comprises the following steps:
Prepare high ductility fibrous cement paste: cement, CHARACTERISTICS OF TAILINGS SAND, flyash mix are added the most afterwards water and carries out stirring for the first time；It is subsequently adding magnesium oxide, water and water reducer to carry out stirring for the second time；It is eventually adding PVA fiber and water carries out third time and stirs, obtain high ductility fibrous cement paste；
The high ductility fibrous cement paste made is poured into antiseepage position by placing installation, forms cut-pff wall.
The preparation method with high ductility fibre cement cut-pff wall utilizing CHARACTERISTICS OF TAILINGS SAND to prepare the most according to claim 7, it is characterised in that described high ductility cement mortar is according to mass percent, including following components:
Cement 10-24%,
CHARACTERISTICS OF TAILINGS SAND 20-25%,
Flyash 35-55%,
Water 5-16%,
Water reducer 0.2-0.5%,
Magnesium oxide 2-3%,
And PVA fiber,
Wherein, the volume volume of PVA fiber is the 1-2% of high ductility cement mortar cumulative volume.
The preparation method with high ductility fibre cement cut-pff wall utilizing CHARACTERISTICS OF TAILINGS SAND to prepare the most according to claim 7, it is characterized in that, described prepare high ductility fibrous cement paste during, the mass ratio of the water added in stirring for the first time, second time stirring and third time stirring is 15:
2:3。
10. according to utilizing the preparation method with high ductility fibre cement cut-pff wall prepared by CHARACTERISTICS OF TAILINGS SAND described in claim 7,8 or 9, it is characterised in that in described first time stirring, CHARACTERISTICS OF TAILINGS SAND processes through infiltration irrigation, and detailed process is:
CHARACTERISTICS OF TAILINGS SAND is sieved through 35 mesh standard sieves；
Preparation infiltration rinse solution, containing the 0.5 1.0 pure acetic acid of mol, the edta solution of 0.1 0.2mmol, the sodium hydroxide powder of 0.5 0.8mol and the pure hydrochloric acid solution of 0.2 0.4mol in every liter of this solution；
The CHARACTERISTICS OF TAILINGS SAND sieved is stirred with infiltration rinse solution, forms solidliquid mixture；
Solidliquid mixture is filtered, and rinses with water, 100-105 degree Celsius of drying in oven, form the CHARACTERISTICS OF TAILINGS SAND rinsed through infiltration.
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| CN113292307A (en) * | 2021-04-17 | 2021-08-24 | 菏泽永民新型建筑材料股份有限公司 | Impermeable material based on building residue soil |
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