CN108002801A - A kind of construction method of magnesium phosphate cement in the road - Google Patents
A kind of construction method of magnesium phosphate cement in the road Download PDFInfo
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- CN108002801A CN108002801A CN201711203365.4A CN201711203365A CN108002801A CN 108002801 A CN108002801 A CN 108002801A CN 201711203365 A CN201711203365 A CN 201711203365A CN 108002801 A CN108002801 A CN 108002801A
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- magnesium phosphate
- concrete
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- road
- construction method
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Classifications
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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
- C04B28/34—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 cold phosphate binders
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/142—Mixtures or their components, e.g. aggregate
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of construction method of magnesium phosphate cement in the road.This construction method comprises the following steps：1) construction site prepares；2) magnesium phosphate cement slurry is prepared；3) foam is prepared；4) foam magnesium phosphate concrete is prepared；5) foam magnesium phosphate concrete is poured into a mould；6) foam magnesium phosphate concrete conserves.The present invention largely consumes discarded concrete building waste, and has carried out recycling, and obtained foam magnesium phosphate concrete can substitute cement, meet the construction requirement of highway high roadbed, it is possible to reduce to the consumption of cement in engineering, be conducive to energy-saving and emission-reduction.
Description
Technical field
The present invention relates to a kind of construction method of magnesium phosphate cement in the road.
Background technology
Western China, landforms, in mountain area building highway, are subject to landform, landforms, hydrogeology based on mountainous region
The limitation of condition, inevitably needs to carry out existing roadbed high roadbed enlarging construction；While in order to meet national entirety
Planning requirement, and the earthwork resource of excavation is preferably made good use of, can more and more it be used when carrying out highway extension project
The form of high-fill roadbed.In High Grade Highway in Mountain Area, embankment and cut subgrade account for 80%, wherein the height more than 20m is filled out
Fang Ludi is not within minority.And as the promotion of national policy, transport development are quickly grown, in highway extension project from now on
The structure type of high embankment all will further improve, high embankment will also become roadbed knot either quantitatively or in height
The principal mode of structure.
It is higher to its bottom foundation trench requirement for bearing capacity since soil body vertical pressure is larger in high-fill roadbed region, and
Often due to the duration is tighter, its sufficient static balance time can not be given, cause newly to repair roads easily goes out in use
Existing differential settlement phenomenon.And the concrete light of light foam concrete weight ratio same volume, account for 30%~50%, Ke Yi great
It is big to reduce relevant pressure and posterior settlement, therefore the high roadbed application of light foam concrete progress highway is used, can be extensive
Save the maintenance cost in later stage and ensure traffic safety.
It is about 100,000,000 tons that building waste is removed in China every year, wherein 34% is discarded concrete, then it is resulting discarded mixed
Solidifying soil just has 34,000,000 tons, and in addition also newly constructed house produces and discards coagulation caused by 40,000,000 tons of building waste
Soil, so how to utilize discarded concrete just into a research hotspot.In the past, most of researchs on discarded concrete are all
Concentrate on and prepared using discarded concrete aggregate in the research of regeneration aggregate, using the powder in discarded concrete research then very
Rare report.
Magnesium phosphate cement is to be found and be used in casting industry by Prosen in nineteen thirty-nine earliest, also referred to as chemistry
With reference to phosphate concrete.Usually reacted and be made by a certain percentage by reheating MgO, phosphate and retarder.Due to its tool
Have intensity generation is early, intensity is high, cohesiveness is good, durability is good, volume stability is good, environment temperature suitability is strong, pH value is low, with
The compatibility of fiber is good and the advantages that good biocompatibility, widely studied and apply by Chinese and overseas scholars.But at present, magnesium phosphate glue
The manufacturing cost of gel material is higher, its mechanical property remains to be further improved.
The content of the invention
It is an object of the invention to provide a kind of construction method of magnesium phosphate cement in the road.
The technical solution used in the present invention is：
A kind of construction method of magnesium phosphate cement in the road, comprises the following steps：
1) construction site prepares：Smooth, cleaning construction site, separates place into some pieces of construction areas with template；
2) magnesium phosphate cement slurry is prepared：In mixer, by potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder
Material, polyphosphate sodium, flyash and miberal powder are mixed into siccative, then are mixed with water, obtain magnesium phosphate cement slurry；
3) foam is prepared：In foaming machine, by concrete foamer and water mixed preparing foaming agent solution, foaming agent is expedited the emergence of
Solution foaming, obtains foam；
4) foam magnesium phosphate concrete is prepared：By magnesium phosphate cement slurry and foams mix, foam magnesium phosphate coagulation is obtained
Soil；
5) foam magnesium phosphate concrete is poured into a mould：Foam magnesium phosphate concrete is pumped to construction area with pipeline, passes through bubble
The gravity flow of foam magnesium phosphate concrete is poured into a mould；
6) foam magnesium phosphate concrete conserves：After foam magnesium phosphate concrete final set, watering maintenance is carried out.
In step 1), the height of template<1m, the area of every piece of construction area<400m2。
In step 2), potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder, polyphosphate sodium, flyash and miberal powder
Mass ratio is (14~16)：(23~25)：(28~32)：1：(28~32)：(18~22)；The water content of magnesium phosphate cement slurry
For 35~45wt%.
In step 2), discarded concrete powder for build concrete discarded object after crushing, after 180~230 mesh sieves
The powder that net obtains.
In step 2), flyash is II grade of F class flyash, and miberal powder is ground granulated blast furnace slag.
In step 3), the mass ratio 1 of concrete foamer and water：(18~20)；It is to pass through air compressor to expedite the emergence of foaming
Foaming is expedited the emergence of, the operating pressure of air compressor is 0.7~0.9MPa；Expansion ratio is the 18~22 of foaming agent solution volume
Times.
In step 4), foam accounts for the 60~70% of foam magnesium phosphate concrete cumulative volume.
In step 4), the wet density of foam magnesium phosphate concrete is controlled in 500kg/m3~600kg/m3。
In step 5), the outlet of pipeline is concordant with the casting area of foam magnesium phosphate concrete.
In step 6), the time of maintenance is no less than 10 days.
The beneficial effects of the invention are as follows：
The present invention largely consumes discarded concrete building waste, and has carried out recycling, obtained foam phosphoric acid
Magnesium concrete can substitute cement, meet the construction requirement of highway high roadbed, it is possible to reduce to the consumption of cement in engineering, favorably
In energy-saving and emission-reduction.
Embodiment
A kind of construction method of magnesium phosphate cement in the road, comprises the following steps：
1) construction site prepares：Smooth, cleaning construction site, separates place into some pieces of construction areas with template；
2) magnesium phosphate cement slurry is prepared：In mixer, by potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder
Material, polyphosphate sodium, flyash and miberal powder are mixed into siccative, then are mixed with water, obtain magnesium phosphate cement slurry；
3) foam is prepared：In foaming machine, by concrete foamer and water mixed preparing foaming agent solution, foaming agent is expedited the emergence of
Solution foaming, obtains foam；
4) foam magnesium phosphate concrete is prepared：By magnesium phosphate cement slurry and foams mix, foam magnesium phosphate coagulation is obtained
Soil；
5) foam magnesium phosphate concrete is poured into a mould：Foam magnesium phosphate concrete is pumped to construction area with pipeline, passes through bubble
The gravity flow of foam magnesium phosphate concrete is poured into a mould；
6) foam magnesium phosphate concrete conserves：After foam magnesium phosphate concrete final set, watering maintenance is carried out.
Preferably, in step 1), the height of template<1m, the area of every piece of construction area<400m2。
Preferably, in step 2), potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder, polyphosphate sodium, flyash
Mass ratio with miberal powder is (14~16)：(23~25)：(28~32)：1：(28~32)：(18~22)；Magnesium phosphate cement slurry
Water content be 35~45wt%；It is further preferred that in step 2), potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder
Material, polyphosphate sodium, the mass ratio of flyash and miberal powder are 15：24：30：1：30：20；The water content of magnesium phosphate cement slurry is
40wt%.
Preferably, in step 2), discarded concrete powder for build concrete discarded object after crushing, after 180~
The powder that 230 mesh sieve nets obtain；It is further preferred that in step 2), discarded concrete powder is build concrete discarded object
After crushing, the powder obtained after 200 mesh sieve nets.
Preferably, in step 2), flyash is II grade of F class flyash, and miberal powder is ground granulated blast furnace slag.
Preferably, in step 3), the mass ratio 1 of concrete foamer and water：(18~20)；It is to pass through air to expedite the emergence of foaming
Compressor expedites the emergence of foaming, and the operating pressure of air compressor is 0.7~0.9MPa；Expansion ratio is the 18 of foaming agent solution volume
~22 times；It is further preferred that in step 3), the mass ratio 1 of concrete foamer and water：19；The work pressure of air compressor
Power is 0.8MPa；Expansion ratio is 20 times of foaming agent solution volume.
Further, in step 3), concrete foamer prepares the Traditional blowing agents used, such as rosin for Foam lightweight soil
Sour soaps foaming agent, metallic aluminium powder foaming agent, vegetable protein foaming agent, animal protein foaming agent, resin soaps foaming agent, hydrolysis
Blood glue foaming agent, mahogany acid aluminium foaming agent etc..
Preferably, in step 4), foam accounts for the 60~70% of foam magnesium phosphate concrete cumulative volume.
Preferably, in step 4), the wet density of foam magnesium phosphate concrete is controlled in 500kg/m3~600kg/m3。
Preferably, in step 5), the outlet of pipeline is concordant with the casting area of foam magnesium phosphate concrete.
Preferably, in step 6), the time of maintenance is no less than 10 days；It is further preferred that in step 6), the time of maintenance
For 10~14 days.
Present disclosure is described in further detail below by way of specific embodiment.
Embodiment：
1st, construction site prepares
Farm Planning includes：Levelling of the land, cleans place rubbish and floating dust, the surface dust in place cleaning, in order to avoid influence to pour
The combination power of foam concrete and basic unit after note, keeps pending place clean, smooth, firm and dry；During dry weather
Watering pretreatment is carried out to place, place is soaked, at least spills twice, to increase the combination power of pouring layer and basic unit, but basic unit's table
Face must not have obvious ponding, with prevent basic unit because absorb water it is excessive and caused by lather collapse in foam concrete；To be constructed field
Ground is separated into area with template and is less than 400m2Region, and with falsework fixed form, prevent foam coagulation in work progress
Earth lateral pressure causes template to collapse；Form height needs to adjust according to each construction, and each construction height is no more than 1m.
2nd, magnesium phosphate cement slurry is prepared
By mass parts, 150 parts of potassium dihydrogen phosphates, 240 parts of dead burned magnesias, 300 parts are finely ground to 200 purposes and discard coagulation
Native powder, 10 parts of polyphosphate sodiums, 300 parts of flyash and 200 parts of miberal powders are added in mixer and stirred 10~20 minutes, speed of agitator
Control is in 20~40r/min, airborne dust during preventing that powder from stirring；800 parts of water is added in tentatively uniformly mixed agitator,
It is then turned on mixer to continue to stir 20min, is mixed into the magnesium phosphate cement slurry that concentration is 60% (water content 40%).
Commercially available 42.5 grades of Portland cements are taken to be mixed into the comparative example cement slurry that concentration is 60% with water, with this
The cement slurry of embodiment carries out contrast test；Test method is：1. slurry is poured in 70.7*70.7*70.7mm marks respectively
In accurate three joint-trial moulds, every group of sample pours into a mould two groups, respectively measuring the intensity of 7 days and 28 days；2. test block is put into temperature is
20 DEG C, relative humidity is that test block is reentered into curing box by the demoulding after maintenance 24h conserves to phase in 90% standard curing box
Age is answered, its 7 days and 28 days intensity are surveyed with the speed of 100N/s with full-automatic pressure testing machine, 3 test blocks are tested per age, are taken
Uniaxial compressive strength of its average value as the age obturation；Strength character test result shows, embodiment its 7 days and 28 days
Uniaxial compressive strength be respectively 42.3MPa and 46.1MPa, and comparative example corresponds to 31.3MPa and 42.2MPa respectively, it is seen that
The uniaxial compressive strength of the present embodiment cementitious material is substantially higher than comparative example.
3rd, foam is prepared
The foaming agent feed pipe of foaming machine is connected in concrete foamer, while connects the water inlet pipe of foaming machine, is set
Good dilution ratio is 20, i.e., the mass ratio of foaming agent and water is 1：19, it is made into foaming agent solution.Then air compression is connected
Machine, the pressure for setting air compressor is 0.8MPa, starts to foam, and final expansion ratio is 20 times, i.e., foams by volume
Agent solution：Foam=1：20, foam diameter is 0.5~3mm.
4th, foam magnesium phosphate concrete is prepared
The magnesium phosphate cement slurry prepared in step 2 is at the uniform velocity conveyed by pumping line to the cement slurry into foaming machine
Feed inlet, while the stir storehouse that the foam prepared is conveyed into foaming machine is stirred, and treats both after mixing, takes mixing
Good foam magnesium phosphate concrete measurement wet density, control wet density is in 500kg/m3~600kg/m3Between, foam volume accounts at this time
The 60%~70% of total foam magnesium phosphate concrete volume.After testing, foam magnesium phosphate concrete its fluidity being prepared
For 340~350, it is possible to achieve self-flowing pastefill.
5th, foam magnesium phosphate concrete is poured into a mould
The foam magnesium phosphate concrete mixed is pumped into the ready workspace of step 1 by pipeline, pipeline opening with
The liquid level of foam magnesium phosphate concrete is concordant, reduces contact of the foam magnesium phosphate concrete with air to the greatest extent, prevents from defoaming.Treat one
After a predetermined workspace cast height reaches design height, pipeline opening can be improved foam concrete progress entirety is put down,
Then feed is stopped, transfer pipe goes to next workspace, and the workspace poured into a mould does not have to manually be struck off.
6th, foam magnesium phosphate concrete conserves
Start watering maintenance after foam magnesium phosphate concrete final set, prevent foam magnesium phosphate concrete surface dehydration drying shrinkage
Cracking.During summer, watering at least 3 times daily；During winter, curing temperature should be controlled at 0~35 DEG C.10 must not be less than by conserving the time limit
My god, it can be appropriately extended by 14 days.After maintenance, its intensity can reach more than 1MPa, meet the construction requirement at scene.
It is of the invention a large amount of foam magnesium phosphate concrete is prepared using solid waste, it make use of miberal powder, flyash
Activity, reduces the demand to cement, is also beneficial to the protection to environment, is conducive to sustainable development；Pass through applying for the present invention
Work method, is 500kg/m using wet density3~600kg/m3Between foam magnesium phosphate concrete, it is possible to achieve Self-leveling, together
When its intensity can also reach the requirement of engineering, without as current construction method, it is also necessary to manually go to strike off, save substantial amounts of people
Work, while the efficiency of cast is improved, shorten the duration of construction.
Claims (10)
- A kind of 1. construction method of magnesium phosphate cement in the road, it is characterised in that：Comprise the following steps：1) construction site prepares：Smooth, cleaning construction site, separates place into some pieces of construction areas with template；2) magnesium phosphate cement slurry is prepared：In mixer, by potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder, poly- Sodium phosphate, flyash and miberal powder are mixed into siccative, then are mixed with water, obtain magnesium phosphate cement slurry；3) foam is prepared：In foaming machine, by concrete foamer and water mixed preparing foaming agent solution, foaming agent solution is expedited the emergence of Foaming, obtains foam；4) foam magnesium phosphate concrete is prepared：By magnesium phosphate cement slurry and foams mix, foam magnesium phosphate concrete is obtained；5) foam magnesium phosphate concrete is poured into a mould：Foam magnesium phosphate concrete is pumped to construction area with pipeline, passes through foam phosphorus The gravity flow of sour magnesium concrete is poured into a mould；6) foam magnesium phosphate concrete conserves：After foam magnesium phosphate concrete final set, watering maintenance is carried out.
- A kind of 2. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step 1) in, the height of template<1m, the area of every piece of construction area<400m2。
- A kind of 3. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step 2) in, potassium dihydrogen phosphate, dead burned magnesia, discarded concrete powder, polyphosphate sodium, the mass ratio of flyash and miberal powder are (14 ~16)：(23~25)：(28~32)：1：(28~32)：(18~22)；The water content of magnesium phosphate cement slurry for 35~ 45wt%.
- A kind of 4. construction method of magnesium phosphate cement according to claim 3 in the road, it is characterised in that：Step 2) in, discarded concrete powder for build concrete discarded object after crushing, after the powder that 180~230 mesh sieve nets obtain.
- A kind of 5. construction method of magnesium phosphate cement according to claim 3 in the road, it is characterised in that：Step 2) in, flyash is II grade of F class flyash, and miberal powder is ground granulated blast furnace slag.
- A kind of 6. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step 3) in, the mass ratio 1 of concrete foamer and water：(18~20)；It is to expedite the emergence of foaming, air by air compressor to expedite the emergence of foaming The operating pressure of compressor is 0.7~0.9MPa；Expansion ratio is 18~22 times of foaming agent solution volume.
- A kind of 7. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step 4) in, foam accounts for the 60~70% of foam magnesium phosphate concrete cumulative volume.
- A kind of 8. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step 4) in, the wet density of foam magnesium phosphate concrete is controlled in 500kg/m3~600kg/m3。
- A kind of 9. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step 5) in, the outlet of pipeline is concordant with the casting area of foam magnesium phosphate concrete.
- A kind of 10. construction method of magnesium phosphate cement according to claim 1 in the road, it is characterised in that：Step It is rapid 6) in, time of maintenance is no less than 10 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711203365.4A CN108002801A (en) | 2017-11-27 | 2017-11-27 | A kind of construction method of magnesium phosphate cement in the road |
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| CN201711203365.4A CN108002801A (en) | 2017-11-27 | 2017-11-27 | A kind of construction method of magnesium phosphate cement in the road |
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Cited By (1)
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| CN101386518A (en) * | 2008-10-28 | 2009-03-18 | 汪宏涛 | High-early-strength magnesium phosphate concrete and preparation method thereof |
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| CN108610089A (en) * | 2018-06-25 | 2018-10-02 | 宿迁德威新材料有限公司 | It is a kind of can fast demoulding assembling thermal-insulating wall board material and preparation method thereof |
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Application publication date: 20180508 |