CN112679183A - Rapid repair mortar and preparation method thereof - Google Patents
Rapid repair mortar and preparation method thereof Download PDFInfo
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- CN112679183A CN112679183A CN202011581628.7A CN202011581628A CN112679183A CN 112679183 A CN112679183 A CN 112679183A CN 202011581628 A CN202011581628 A CN 202011581628A CN 112679183 A CN112679183 A CN 112679183A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a quick repair mortar and a preparation method thereof, wherein the quick repair mortar comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.2-0.3 part of water reducing agent, 0.1-0.2 part of 6 mm short fiber, 0.1-0.2 part of defoaming agent, 0.5-1 part of rubber powder and 0.03-0.05 part of lithium carbonate; the preparation method can add, stir and mix other different raw materials in the process of conveying the raw materials, and the whole process is in a continuous and uninterrupted state, thereby not only ensuring that all the raw materials are uniformly mixed, but also ensuring the production requirement. The repair mortar has the advantages of high early strength, good fluidity, convenient construction, no shrinkage and cracking, simplified working process and improved production efficiency.
Description
Technical Field
The invention relates to the technical field of repair mortar, in particular to rapid repair mortar and a preparation method thereof.
Background
Most of the existing repair mortars only comprise cement, sand and a water reducing agent, and the problems of early strength and cracking can not be solved. Particularly in cold winter, the construction period is prolonged due to too slow strength, the vehicle can be started after the road is closed for 14 days due to road repair, the maintenance or curing cost is increased, and the repair quality is affected because most repair mortar is easy to crack due to hydration shrinkage of cement and the like due to high mortar strength.
In addition, when current repair mortar dry powder is prepared, each raw materials is sieved firstly, sieve down and accord with the joining agitating unit that the particle size required, the material that the particle size is great on the sieve needs to set up the recovery in addition, send into reducing mechanism crushed aggregates after retrieving, then sieve again, complex operation is unfavorable for simplifying the work flow, improve production efficiency, and all raw materials stir in adding same agitating unit at last, because of agitating unit is usually the volume great, stir a large amount of raw materials, it is inhomogeneous to appear stirring easily, perhaps the longer problem of churning time.
Disclosure of Invention
The invention provides the rapid repair mortar and the preparation method thereof, and the repair mortar has the advantages of high early strength, good fluidity, convenient construction, no shrinkage and no cracking, simplifies the working process and improves the production efficiency.
The technical scheme of the invention is realized as follows: the quick repair mortar comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.2-0.3 part of water reducing agent, 0.1-0.2 part of 6 mm short fiber, 0.1-0.2 part of defoaming agent, 0.5-1 part of rubber powder and 0.03-0.05 part of lithium carbonate.
Further, the feed comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.3 part of water reducing agent, 0.2 part of 6 mm short fiber, 0.15 part of defoaming agent, 0.8 part of rubber powder and 0.05 part of lithium carbonate.
A preparation method of rapid repair mortar comprises the following steps:
(1) respectively adding PO42.5 cement, sulphoaluminate cement and gypsum into different first screening machines for screening, continuously adding corresponding raw materials into a first conveying stirrer by the first screening machines, and stirring the added raw materials by the first conveying stirrer in the conveying process to obtain a mixed material A;
(2) respectively adding 20-80-mesh quartz sand, a water reducing agent, 6-millimeter short fibers, an antifoaming agent, rubber powder and lithium carbonate into different second screening machines for screening, continuously adding corresponding raw materials into a second conveying stirrer by the second screening machines, and stirring the added raw materials by the second conveying stirrer in the conveying process to obtain a mixed material B;
(3) the mixed material A continuously enters a third conveying stirrer through a discharge hole of the first conveying stirrer, the mixed material B continuously enters the third conveying stirrer through a discharge hole of the second conveying stirrer, the third conveying stirrer stirs the mixed material A and the mixed material B in the conveying process, and the discharge hole of the third conveying stirrer continuously outputs the rapid repair mortar.
Further, first screening machine and second screening machine all include the material loading case and set up in the toper storage case of material loading case lower extreme, one side in the material loading case is provided with the first screen cloth of slope decurrent, the top of first screen cloth is provided with the inlet pipe, the broken frame of opposite side of material loading case, the downside of first screen cloth free end is arranged in to broken frame one end, the other end links to each other with vertical flexible hydraulic stem, the middle part of broken frame lower extreme is provided with the pivot, the tip and the material loading case of pivot rotate and link to each other, middle part in the broken frame is provided with motor drive's the roller that rolls, roll roller and pivot axial direction parallel, the broken frame bottom of rolling roller both sides all is provided with the second screen cloth, the tip of rolling roller passes.
Furthermore, a plurality of first screening machines are arranged on the first conveying stirring machine at intervals along the axial direction, the first screening machines correspond to the adding raw materials in the step (1) one by one, a plurality of second screening machines are arranged on the second conveying stirring machine at intervals along the axial direction, and the second screening machines correspond to the adding raw materials in the step (2) one by one.
Furthermore, a vertical partition plate is arranged on the lower side of the first screen, a limiting seat is arranged on one side, close to the crushing frame, of the partition plate, an elastic pad is arranged on the limiting seat, and the limiting seat is located below the crushing frame.
Furthermore, the first conveying stirrer, the second conveying stirrer and the third conveying stirrer comprise a mixing barrel, a motor-driven rotating shaft is arranged in the mixing barrel, and a spiral conveying blade and a stirring rod are arranged on the rotating shaft.
The invention has the beneficial effects that:
the rapid repair mortar adopts the three-component system cementing materials (ordinary portland cement, aluminate cement and gypsum) to generate the ettringite in the hydration process, the shrinkage of the cement is compensated by the principle of micro-expansion of the ettringite, and in addition, the cracking risk of the product is further reduced by adding the short fibers. The early strength of the repair is improved due to the introduction of the sulphoaluminate cement, and the early strength is improved once because the lithium carbonate has the effect of early strength, which means that the setting time is short and the early strength is high.
The rapid repair mortar can walk for 2 hours and go to the bus for 3 hours when the temperature is about 25 ℃, can walk for 4 hours and also go to the bus for 12 hours even after the repair mortar is constructed in cold winter, and a repaired road can not crack because of cement shrinkage, and the construction period is not prolonged because the road surface which is not closed for too long time due to insufficient strength or repaired in various conditions is damaged, so that the maintenance cost is increased. The rapid repair mortar has the setting time of 60 minutes at the temperature of 25 ℃, the strength of more than 30 MPa in 4 hours and the strength of more than 60 MPa in 28 days.
The preparation method of the rapid repair mortar can add, stir and mix other different raw materials in the raw material conveying process, and the whole process is in a continuous and uninterrupted state, so that the uniform mixing of all the raw materials can be ensured, and the production requirement can be ensured; the raw materials are sieved by the sieving machine, enter the conical storage box, the raw materials with larger particle sizes on the sieve slide down to the crushing frame without other transmission devices, the crushing frame is driven to swing up and down by the telescopic hydraulic rod, the raw materials in the crushing frame are sent to the rolling roller, and after being crushed by the rolling roller, the raw materials fall into the conical storage box through the second sieving net without additional recovery, the work flow is simplified, the production efficiency is improved, the first sieving net can be jacked by the crushing frame due to the up-and-down swing of the crushing frame, and the residual accumulated raw materials on the first sieving net are shaken off.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a picture before road repair;
FIG. 2 is a picture after the rapid repair mortar of the present invention is used for repair;
FIG. 3 is a schematic view of a first conveyer-stirrer;
fig. 4 is a schematic structural view of a first screening machine;
fig. 5 is a schematic view of the structure of the laminating roller.
The device comprises a first conveying stirrer 1, a first sieving machine 2, a second conveying stirrer 3, a second sieving machine 4, a third conveying stirrer 5, a rotating shaft 6, a spiral conveying blade 7, a stirring rod 8, a feeding box 9, a conical storage box 10, a first screen 11, a feeding pipe 12, a crushing frame 13, a telescopic hydraulic rod 14, a supporting shaft 15, a rolling roller 16, a second screen 17, a vertical hole 18, elastic dustproof cloth 19, a guide rod 20, a bearing seat 21, a guide block 22, a first compression spring 23, a supporting seat 24, a second compression spring 25, a partition plate 26, a limiting seat 27 and an elastic cushion 28.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example one
The quick repair mortar comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.2 part of water reducing agent, 0.1 part of 6 mm short fiber, 0.1 part of defoaming agent, 0.5 part of rubber powder and 0.03 part of lithium carbonate.
The rapid repair mortar of the embodiment has the setting time of 60 minutes, the 4-hour strength of 32 MPa and the 28-day strength of 61 MPa at the temperature of 25 ℃.
Example two
The quick repair mortar comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.25 part of water reducing agent, 0.15 part of 6 mm short fiber, 0.2 part of defoaming agent, 1 part of rubber powder and 0.04 part of lithium carbonate.
The rapid repair mortar of the embodiment has the setting time of 60 minutes, the 4-hour strength of 31 MPa and the 28-day strength of 61 MPa at the temperature of 25 ℃.
EXAMPLE III
The quick repair mortar comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.3 part of water reducing agent, 0.2 part of 6 mm short fiber, 0.15 part of defoaming agent, 0.8 part of rubber powder and 0.05 part of lithium carbonate.
The rapid repair mortar of the embodiment has the setting time of 60 minutes, the 4-hour strength of 33 MPa and the 28-day strength of 64 MPa at the temperature of 25 ℃.
Example four
As shown in fig. 3, the preparation method of the rapid repair mortar according to the first to third embodiments includes the following steps:
(1) respectively adding PO42.5 cement, sulphoaluminate cement and gypsum into different first screening machines 2 for screening, continuously adding corresponding raw materials into a first conveying and stirring machine 1 by the first screening machines 2, and stirring the added raw materials by the first conveying and stirring machine 1 in the conveying process to obtain a mixed material A;
(2) respectively adding 20-80-mesh quartz sand, a water reducing agent, 6-millimeter short fibers, an antifoaming agent, rubber powder and lithium carbonate into different second screening machines 4 for screening, continuously adding corresponding raw materials into a second conveying and stirring machine 3 by the second screening machines 4, and stirring the added raw materials in the conveying process by the second conveying and stirring machine 3 to obtain a mixed material B;
(3) the mixed material A continuously enters the third conveying stirrer 5 through the discharge hole of the first conveying stirrer 1, the mixed material B continuously enters the third conveying stirrer 5 through the discharge hole of the second conveying stirrer 3, the mixed material A and the mixed material B are stirred by the third conveying stirrer 5 in the conveying process, and the quick repair mortar is continuously output from the discharge hole of the third conveying stirrer 5.
As shown in fig. 1, a plurality of first screening machines 2 are axially arranged on a first conveying mixer 1 at intervals, the first screening machines 2 correspond to the added raw materials in the step (1) one by one, the first screening machines 2 are positioned on the left side of the upper end of the first conveying mixer 1, a discharge port is formed in the right side of the lower end of the first conveying mixer 1, and PO42.5 cement, sulphoaluminate cement and gypsum are sequentially placed into the 3 different first screening machines 2 from left to right. Set up a plurality of second screening machines 4 along axial interval on the second transport mixer 3, a plurality of second screening machines 4 and the interpolation raw materials one-to-one in step (2), second screening machine 4 is located the right side of second transport mixer 3 upper end, the left side of second transport mixer 3 lower extreme is provided with the discharge gate, 20-80 mesh quartz sand, the water-reducing agent, 6 millimeter short fibers, the defoaming agent, rubber powder and lithium carbonate are from the right side to left side and are put into 6 different second screening machines 4 in proper order, ejection of compact control valve is all installed to the discharge end of first screening machine 2 and second screening machine 4, first transport mixer 1, second transport mixer 3 and third transport mixer 5 all include the compounding section of thick bamboo, be provided with motor drive's pivot 6 in the compounding section of thick bamboo, be provided with spiral conveying blade 7 and puddler 8 in the pivot 6. Motor drive pivot 6 rotates, and pivot 6 drives puddler 8 and helical conveying blade 7 and rotates, and helical conveying blade 7 drives the raw materials and carries, and the stirring of the raw materials is accomplished to cooperation puddler 8 simultaneously and is mixed.
As shown in fig. 3 and 4, the first screening machine 2 and the second screening machine 4 both include a feeding box 9 and a conical storage box 10 fixed at the lower end of the feeding box 9, a first screen 11 inclined downwards is fixed at one side in the feeding box 9, a feeding pipe 12 is fixed above the first screen 11, a crushing frame 13 at the other side of the feeding box 9, one end of the crushing frame 13 is arranged at the lower side of the free end of the first screen 11, the other end of the crushing frame is connected with a vertical telescopic hydraulic rod 14, a supporting shaft 15 is fixed at the middle part of the lower end of the crushing frame 13, the end part of the supporting shaft 15 is rotatably connected with the feeding box 9 through a bearing, a rolling roller 16 driven by a motor is arranged at the middle part in the crushing frame 13, the rolling roller 16 is axially parallel to the supporting shaft 15, and second screens 17 are fixed at the.
The raw materials enter a feeding box 9 through a feeding pipe 12, the raw materials are firstly screened through a first screen mesh 11, the screened raw materials enter a conical storage box 10, the raw materials with larger particles on the screen enter a crushing frame 13 along the first screen mesh 11, a telescopic hydraulic rod 14 extends to drive the end part of the crushing frame 13 to rotate up and down along a rotating shaft 6, when the telescopic hydraulic rod 14 extends, the right end of the crushing frame 13 rises to push against the first screen mesh 11 to shake the residual raw materials on the first screen mesh 11 into the crushing frame 13, meanwhile, the raw materials at the right end in the crushing frame 13 slide to a rolling roller 16, a motor drives the rolling roller 16 to rotate to crush the raw materials, the crushed raw materials continuously slide to a second screen mesh 17 at the left end and fall into the conical storage box 10 after being screened by the second screen mesh 17, when the telescopic hydraulic rod 14 contracts, the left end of the crushing frame 13 rises, the right end descends, the residual raw materials in the crushing frame 13 slide to the rolling roller 16, the motor drive rolls 16 antiport, carries out the breakage to the raw materials, and the raw materials after the breakage continues to slide to the second screen cloth 17 of right-hand member, falls into toper storage case 10 after second screen cloth 17 sieves. The screening and crushing of the raw materials are completed through the structure, and the recovery equipment and the process of large-particle raw materials are omitted.
Go up and be provided with vertical hole 18 on the workbin 9, vertical hole 18 internal fixation has elasticity dustproof cloth 19, and the tip of roller 16 passes elasticity dustproof cloth 19 and links to each other with bearing frame 21, and bearing frame 21 links to each other with elastic component, and elastic component links to each other with last workbin 9. The elastic component comprises a guide rod 20, the lower end of the guide rod 20 is connected with a bearing seat 21, a guide block 22 is fixed on the feeding box 9, the upper end of the guide rod 20 penetrates through the guide block 22 in a sliding mode, a nut is connected with the upper end of the guide rod through threads, a first compression spring 23 is sleeved on the guide rod 20 between the nut and the guide block 22, a supporting seat 24 is arranged on the feeding box 9 below the bearing seat 21, and a second compression spring 25 used for supporting the bearing seat 21 is arranged in the supporting seat 24. Through the arrangement of the elastic component, when the crushing frame 13 swings up and down along the supporting shaft 15, the rolling roller 16 can be synchronously adjusted up and down and is tightly attached to the bottom in the crushing frame 13 in real time.
A vertical partition plate 26 is fixed in the upper box 9 on the lower side of the first screen mesh 11, the upper end of the partition plate 26 abuts against the lower side of the first screen mesh 11, a limiting seat 27 is fixed on one side of the partition plate 26 close to the crushing frame 13, an elastic cushion 28 is arranged on the limiting seat 27, and the limiting seat 27 is located below the crushing frame 13. The partition plate 26 is used for supporting the first screen mesh 11, and meanwhile, large-particle raw materials falling on the first screen mesh 11 are prevented from entering the conical storage box 10, and the limiting seat 27 plays a limiting role in the swinging of the crushing frame 13.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The quick repair mortar is characterized in that: the feed comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.2-0.3 part of water reducing agent, 0.1-0.2 part of 6 mm short fiber, 0.1-0.2 part of defoaming agent, 0.5-1 part of rubber powder and 0.03-0.05 part of lithium carbonate.
2. The rapid repair mortar of claim 1, wherein: the feed comprises the following raw materials in parts by weight: 25 parts of PO42.5 cement, 21 parts of sulphoaluminate cement, 3 parts of gypsum, 50 parts of 20-80-mesh quartz sand, 0.3 part of water reducing agent, 0.2 part of 6 mm short fiber, 0.15 part of defoaming agent, 0.8 part of rubber powder and 0.05 part of lithium carbonate.
3. The method for preparing the rapid repair mortar of claim 1 or 2, comprising the steps of:
(1) respectively adding PO42.5 cement, sulphoaluminate cement and gypsum into different first screening machines for screening, continuously adding corresponding raw materials into a first conveying stirrer by the first screening machines, and stirring the added raw materials by the first conveying stirrer in the conveying process to obtain a mixed material A;
(2) respectively adding 20-80-mesh quartz sand, a water reducing agent, 6-millimeter short fibers, an antifoaming agent, rubber powder and lithium carbonate into different second screening machines for screening, continuously adding corresponding raw materials into a second conveying stirrer by the second screening machines, and stirring the added raw materials by the second conveying stirrer in the conveying process to obtain a mixed material B;
(3) the mixed material A continuously enters a third conveying stirrer through a discharge hole of the first conveying stirrer, the mixed material B continuously enters the third conveying stirrer through a discharge hole of the second conveying stirrer, the third conveying stirrer stirs the mixed material A and the mixed material B in the conveying process, and the discharge hole of the third conveying stirrer continuously outputs the rapid repair mortar.
4. The preparation method of claim 3, wherein the first screening machine and the second screening machine each comprise a feeding box and a conical storage box arranged at the lower end of the feeding box, a first screen inclining downwards is arranged on one side in the feeding box, a feeding pipe is arranged above the first screen, a crushing frame is arranged on the other side of the feeding box, one end of the crushing frame is arranged below the free end of the first screen, the other end of the crushing frame is connected with a vertical telescopic hydraulic rod, a rotating shaft is arranged in the middle of the lower end of the crushing frame, the end part of the rotating shaft is rotatably connected with the feeding box, a rolling roller driven by a motor is arranged in the middle of the crushing frame, the rolling roller is axially parallel to the rotating shaft, the second screen is arranged at the bottom of the crushing frame on two sides of the rolling roller, and the end part.
5. The preparation method according to claim 3 or 4, wherein a plurality of first sieving machines are axially arranged on the first conveying and stirring machine at intervals, the plurality of first sieving machines correspond to the additive raw materials in the step (1) one by one, and a plurality of second sieving machines are axially arranged on the second conveying and stirring machine at intervals, and the plurality of second sieving machines correspond to the additive raw materials in the step (2) one by one.
6. The preparation method according to claim 4, wherein a vertical spacing plate is arranged on the lower side of the first screen, a limiting seat is arranged on one side of the spacing plate close to the crushing frame, an elastic cushion is arranged on the limiting seat, and the limiting seat is positioned below the crushing frame.
7. The method according to claim 3, wherein the first transporting agitator, the second transporting agitator and the third transporting agitator each comprise a mixing drum, and a motor-driven rotating shaft is provided in the mixing drum, and a screw transporting blade and an agitating bar are provided on the rotating shaft.
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