CN108585713A - A kind of injecting paste material of cement mortar - Google Patents
A kind of injecting paste material of cement mortar Download PDFInfo
- Publication number
- CN108585713A CN108585713A CN201810570022.XA CN201810570022A CN108585713A CN 108585713 A CN108585713 A CN 108585713A CN 201810570022 A CN201810570022 A CN 201810570022A CN 108585713 A CN108585713 A CN 108585713A
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- Prior art keywords
- cement
- paste material
- injecting paste
- weight ratio
- quartz sand
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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
- C04B28/02—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
- C04B28/06—Aluminous cements
-
- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
A kind of injecting paste material of cement mortar, including cement, water and quartz sand, water are (0.46~0.50) with cement weight ratio:1, quartz sand is (0.5~1) with cement weight ratio:1.The present invention is directed to weak loose and broken formation serious deformation Disaster Characteristics, adequately achieves the high-strength fast hardness energy that stratum grouting and reinforcing and bolt grouting are reinforced, 4h compression strength>10MPa；The timely and effective performance of energy is reinforced and suspension function, and through Weihe force ridges high speed Mu Zhai tunnel scene practical application, effect is extremely notable.In addition, mobility is good：Presetting period is 40 ± 5min.Injecting paste material of the present invention realizes the purpose of early-strong-fast-hard using cement as cementitious material；The shrinkage and creep of frictional resistance and improvement cement is effectively improved by adding sand.Tunnel scene feeds and mix is simple, and strong operability is greatly improved dispensing accuracy and slip casting efficiency.Good penetrability, calculus rate is high, and cheap, is suitble to promote.
Description
Technical field
The present invention relates to a kind of injecting paste materials of cement mortar, belong to injecting paste material technical field.
Background technology
China is that Tunnel Engineering is largest, quantity is most in the world, builds fastest country.By 2016
Bottom is completed vcehicular tunnel 14040km/15181, and railway tunnel 15781km/14700 will be completed by the end of the year 2017.
Based on mountainous region and weight mound, topographic and geologic complicated condition is changeable for central and west regions, and development traffic will necessarily encounter greatly
The Tunnel Engineering of amount.With the raising of tunnel construction standard and construction scale, high ground stress soft rock stress area is safely and efficiently passed through
Huge challenge is faced, when especially passing through weak loose crushing rock stratum, high ground stress soft rock stress large deformation problem protrudes, existing
Tunnel theory method and construction technique level cannot meet the needs of engineering is prevented and reduced natural disasters.Such as：In September, 2017 is built up
Based on carbonaceous slate large deformation occurs for the long 19.1km in the ridges Lan Yu Railway Mu Zhai tunnel being open to traffic, country rock, most in work progress
Big convergent deformation reaches 2.59m, and maximum arch sedimentation reaches 1.81m, and preliminary bracing and secondary lining is caused to invade limit, cracking, local collapse
It falls into, is forced frequently to change arch, causes construction delay 33 months, social influence is severe.
It is different according to slip casting object and purpose, in tunnel slip casting can be divided into：Cave in body slip casting, tunnel sealing slip casting, ground
5 major class such as consolidation grouting, stratum consolidation slip casting, bolt grouting.Stratum slip casting and bolt anchorage (such as pressure-relieving achor bar) are that control is soft
Weak loose and broken formation large deformation is most effective, most common engineering measure.Therefore, the performance of slurries carrys out tunnel grouting engineering
It says particularly important.Injecting paste material is the key that reinforce weak surrounding rock to form fixing collar and Load -carring arch and provide anchor-holding force of anchor bolt.
In the design of Grouting engineering, the selection of slurries is important a ring, it directly affects the quality of slip casting and the cost of engineering.
Since the purpose of slip casting is different with requirement, the slurries of selection should also be different.The previous general injecting paste material of Tunnel Engineering is common
Silicate cement cement paste, cement paste (ratio of mud is in terms of the 0.5) setting time commonly greater than 5h, according to tunnel normal procedure
Used time, tunnel have been carried out the construction of 1 separate explosion.Tunnel is disturbed since self structure stability is poor in dead weight and explosion
Sedimentation and deformation is tended to occur under dynamic additional load effect, more persons are up to 100~200mm/d, the water filled around anchor pole at this time
Slurry liquid still without or only minimum intensity and bond stress, anchor-holding force of anchor bolt, to the suspension function of preliminary bracing and to enclosing
The extruding reinforcement effect of rock cannot be played timely and effectively, and country rock comes to nothing with preliminary bracing, and top covering rockmass loses supporting about
Beam, due to soft rock cohesion very little, it is difficult to the additional load for overcoming dead weight and construction disturbance to generate, make arch rock mass generate to
Under sliding and loosening, and then arch relaxation zone is caused to expand, preliminary bracing structural stability further deteriorates, and steelframe occurs
The preliminary bracings unstable failure problems such as distortion fractures, gunite concrete cracks, aggravate the generation of large deformation disaster.Therefore, big to become
The prevention and control in shape tunnel are often extremely difficult and difficult become effective.Therefore, for weak loose and broken formation serious deformation calamity
Harmful prevention, the injecting paste material for being usually used in stratum consolidation and bolt anchorage have the following disadvantages：
(1) it is lack of pertinence.The characteristic and mechanism shortage of weak loose and broken formation serious deformation catastrophe are directed to
Property, control effect is undesirable.
(2) early strength is low.Country rock cannot be reinforced in time and anchor-holding force of anchor bolt is provided, and (be especially in frequent construction disturbance
Blasting vibration) effect under, sedimentation and deformation easily occurs for preliminary bracing, comes to nothing with country rock, so draw above rock loosen, lure
Large deformation disaster is sent out to occur.
(3) slurries rate of set is slow.It dilutes, be lost in easily under groundwater effect, cause grouting quality poor.
(4) the design ratio of mud is unreasonable.W/C=1:1 excessively dilute cement grout is commonplace in tunnel grouting engineering.
(5) it has little effect, reaction is apparent.For soft rock, common Portland cement is starched not only in tunnel
It does not have a due effect, reinforces or anchoring effect is little, due also to the characteristics such as its excessively dilute ratio of mud and rate of set be slow,
Soft rock through a long time infiltrates, and emollescence is apparent, and intensity drastically deteriorates decaying, induces wall rock destabilization and destroys.Meanwhile on tunnel
The increase of country rock load is covered, soft rock tunnel large deformation disaster is aggravated.
(6) tunnel grouting scene dosage is inaccurate, influences slip casting effect.For complicated (the especially outer-penetrating agent of injecting paste material
Slurries excessively) are susceptible to the case where leakage adds or repeats to add certain additive, and complex procedures are not easy to promote and apply.
It can be seen that exploitation is applicable in weak loose and broken formation, meets large deformation tunnel grouting under complicated construction environment and want
It asks, and proportioning is simple and practical, operability is strong, cheap, function admirable injecting paste material is most important.
Invention content
The object of the present invention is to provide a kind of slip castings that is cheap, preparing a kind of simple, high-strength fast hard cement mortar
Material.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of injecting paste material of cement mortar, including cement, water and quartz sand, water and cement weight ratio be (0.46~
0.50):1, quartz sand and cement weight ratio are (0.5~1):1.
The present invention, which further improves, to be, the grain size of quartz sand is 35~70 mesh.
The present invention, which further improves, to be, cement is 425 cement of quick hardening sulphoaluminate.
The present invention, which further improves, to be, water and cement weight ratio are (0.48~0.50):1, quartz sand and cement
Weight ratio is (0.5~1):1.
The present invention, which further improves, to be, water and cement weight ratio are (0.46~0.50):1, quartz sand and cement
Weight ratio is (0.8~1):1.
The present invention, which further improves, to be, water and cement weight ratio are (0.48~0.50):1, quartz sand and cement
Weight ratio is (0.8~1):1.
Compared with the general injecting paste material of Tunnel Engineering, injecting paste material of the present invention has the advantages that：
(1) high-strength fast hardness.For weak loose and broken formation serious deformation Disaster Characteristics, stratum is adequately achieved
The high-strength fast hardness energy that grouting and reinforcing and bolt grouting are reinforced, high-strength fast hardness：4h compression strength>10MPa；It can be timely and effective
Reinforcing and suspension function are played, through Weihe force ridges high speed Mu Zhai tunnel scene practical application, effect is extremely notable.In addition, mobility
It is good：Presetting period is 40 ± 5min.
(2) reasonable, strong operability is matched.Injecting paste material of the present invention is realized early strong using cement as cementitious material
Fast hard purpose；The shrinkage and creep of frictional resistance and improvement cement is effectively improved by adding sand.Tunnel scene feeds and mix
Simply, strong operability is greatly improved dispensing accuracy and slip casting efficiency.
(3) good penetrability, calculus rate are high.Cement mortar of the present invention can not only penetrate into loose and broken formation
In joint fissure, and calculus rate is high, the coefficient of friction resistance is big, can effectively play the effect reinforced country rock and provide withdrawal resistance.
(4) cheap, it is suitble to promote.Injecting paste material of the present invention is in the premise for meeting experiment and engine request
Under, compared with cement paste, it can reduce by 20%~50% cement consumption by adding sand, it is cheap, it is easy to push away
Extensively, function admirable, social benefit cheap, easy to spread are truly realized.
Specific implementation mode
In order to make technical problems, technical solutions and advantages to be solved be more clearly understood, tie below
Embodiment is closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to
It explains the present invention, is not intended to limit the present invention.
The injecting paste material of the cement mortar of the present invention, including cement, water and quartz sand, water and cement weight ratio be
(0.46~0.50):1, quartz sand and cement weight ratio are (0.5~1):1.Wherein, the grain size of quartz sand is 35~70 mesh.
Cement is 425 cement of quick hardening sulphoaluminate.
The preparation method of the injecting paste material of above-mentioned cement mortar is：By cement, water and quartz sand example according to above-mentioned weight ratio
It is uniformly mixed.
The present invention selects cementitious material of 425 cement of quick hardening sulphoaluminate as grout coordinate ratio, and aggregate is quartz sand.It is logical
Single factor test Control experiment is crossed with durability strength test Optimization to go out convenient for construction, high-strength fast hard injecting paste material, in conjunction with room
The grouting parameter that interior anchor bolt grouting Mix Ratio Test is obtained, and relied on by engineering of Weihe force ridges high speed Mu Zhai tunnel, input is real
It applies on border.
Embodiment 1
A kind of injecting paste material of cement mortar, including cement, water and quartz sand (35~70 mesh), water and cement weight ratio
Example is 0.50:1, quartz sand and cement weight ratio are 1:1.Using injecting paste material made from this proportioning, it can meet and be directed to
The high-strength fast hardness and good two indexs of mobility of weak loose and broken formation tunnel grouting material.
Embodiment 2
A kind of injecting paste material of cement mortar, including cement, water and quartz sand (35~70 mesh), water and cement weight ratio
Example is 0.48:1, quartz sand and cement weight ratio are 0.8:1.Using injecting paste material made from this proportioning, needle can be met
To the high-strength fast hardness and good two indexs of mobility of weak loose and broken formation tunnel grouting material.
Embodiment 3
A kind of injecting paste material of cement mortar, including cement, water and quartz sand (35~70 mesh), water and cement weight ratio
Example is 0.46:1, quartz sand and cement weight ratio are 0.5:1.Using injecting paste material made from this proportioning, needle can be met
To the high-strength fast hardness and good two indexs of mobility of weak loose and broken formation tunnel grouting material.
Further, for the cement using 425 cement of quick hardening sulphoaluminate (15min initial sets), the test specimen length of side is 40mm,
Span is 100mm, loading velocity 50N/S.
1 novel slurry filling material test of Proportional Ratio of the present invention of table
As shown in Table 1, for Different Water-Cement Ratio (0.50,0.48 and 0.46), by adjusting the ratio of sand and cement,
3 kinds of slurries that optimal screening goes out can meet mobility and high-strength fast rigid two indexs.
Further, it chooses embodiment 1 and carries out bolt grouting and pull-out test in outdoor side slope, and taken at the scene
Sample takes back laboratory maintenance, and specimen size is 70.7mm × 70.7mm × 70.7mm, using mechanical agitation mode, pressure testing
Machine model HYZ-300.10 types, loading velocity 1.3kN/S.
2 field sampling strength test record sheet of table
As shown in Table 2, cement mortar field sampling experiment in, compression strength with the test piece maintenance time increase
And enhance, and can reach the compression strength of 28MPa in 28d.It should be noted that for the mean compressive strength meter of test specimen
It calculates in the following way：If deleting the number there are one ± 10% that measured value exceeds six average value in six measured values
According to using remaining compression strength average as final average data；If still existing beyond average in remaining five test values
The test result of the record data of value ± 10%, the then test block is cancelled.
Further, Portland cement (425R) net slurry and embodiment 1 this cooperation of the ratio of mud for 0.4 are used
Side slope bolt grouting and pull-out test are carried out than injecting paste material.Test result is as listed in table 3.
3 anchor rod drawing test result of table
As shown in table 3, novel slurry filling material of the present invention, the significantly larger than common common silicic acid of anchoring effect
Brine cement paste, the pulling capacity of 4h have been 4 times of Portland cement net slurry 7d age pulling capacities.Meanwhile anchor force
Increase with the increase of bolt diameter and length.It can be seen that novel slurry filling material of the present invention realize it is high-strength fast
Hard test objective, anchoring effect is extremely notable, meets Control Engineering soft rock tunnel large deformation requirement, and simple due to matching
Practical, strong operability, there is significant application value.
Embodiment 4
A kind of injecting paste material of cement mortar, including cement, water and quartz sand (35~70 mesh), water and cement weight ratio
Example is 0.47:1, quartz sand and cement weight ratio are 0.6:1.
Embodiment 5
A kind of injecting paste material of cement mortar, including cement, water and quartz sand (35~70 mesh), water and cement weight ratio
Example is 0.49:1, quartz sand and cement weight ratio are 0.7:1.
Embodiment 6
A kind of injecting paste material of cement mortar, including cement, water and quartz sand (35~70 mesh), water and cement weight ratio
Example is 0.46:1, quartz sand and cement weight ratio are 0.9:1.
The performance of slurries is particularly important for tunnel grouting engineering.The present invention is wanted for large-deformation tunnel in soft rock slip casting
It asks, combines closely with constructing tunnel process, fully consider that tunnel applies anchor pole (including slip casting) to subsequent cycle Blasting Excavation
The process used time (about 4h), it is desirable that novel slurry filling slurries of the present invention need to provide larger intensity and anchor force (experiment in 4h
Room index is compression strength>10MPa), in this way during construction disturbance (especially blasting vibration), tunnel perimeter country rock can
To form fixing collar, Load -carring arch is formed；Meanwhile anchor-holding force of anchor bolt can play a role, and give steelframe and gunite concrete one
Pulling force prevents preliminary bracing from sedimentation and deformation occur under blasting vibration effect, comes to nothing with country rock, gives country rock relaxation traction and becomes
The space of shape.Furthermore, it is contemplated that during the slip casting of tunnel scene, charging, mix, pumping and cleaning grouting equipment are taken
Between (about 40min), it is desirable that the grouting serous fluid presetting period of the present invention is 40 ± 5min.Therefore, of the present invention
Two of injecting paste material qualitative, quantitative Con trolling index are：
(1) high-strength fast hardness：4h compression strength>10MPa；
(2) mobility is good：Presetting period is 40 ± 5min.
Based on above-mentioned two basic indexs, the present invention is at the beginning of experiment to all kinds of cement (portland cement, common silicic acid
Salt cement, Portland fly ash cement, composite Portland cement, sulphate aluminium cement, quick hardening sulphoaluminate cement, iron aluminic acid
Salt cement, expanding cement etc.), it is admixture (flyash, alunite), aggregate (quartz sand, river sand, sea sand, aeolian sand), additional
Agent (water-reducing agent, early strength agent, retarder, swelling agent) basic performance has carried out careful investigation and analysis, is tried by single factor test
Test, the experiment of orthogonal test, dilatancy has carried out up to 500 groups of basic tests to all kinds of cement, final optimization pass screening makes letter
Single, easy to operate, high-strength fast hard, cheap, good penetrability, calculus rate high injecting paste material and match ratio.Finally by outdoor
Field test has carried out practical application in side slope, hole, and effect is extremely notable, effectively control soft rock tunnel concrete cracking,
Peel off, steelframe distortion, fracture, preliminary bracing invade limit etc. large deformation disaster, can wide popularization and application in other Tunnel Engineering, side
In slope engineering, hydraulic engineering, base pit engineering, great popularization.
The above content is in conjunction with specific embodiments to being further described made by the method for the present invention, and it cannot be said that originally
The specific implementation of inventive method is confined to this.For those of ordinary skill in the art to which the present invention belongs, it is not taking off
Several equivalent substitute or obvious modifications are made under the premise of from present inventive concept, and performance or use is identical, all should be considered as belonging to
In present invention scope of patent protection determined by the appended claims.
Claims (6)
1. a kind of injecting paste material of cement mortar, which is characterized in that including cement, water and quartz sand, water is with cement weight ratio
(0.46~0.50):1, quartz sand is (0.5~1) with cement weight ratio:1.
2. a kind of injecting paste material of cement mortar according to claim 1, which is characterized in that the grain size of quartz sand be 35~
70 mesh.
3. a kind of injecting paste material of cement mortar according to claim 1, which is characterized in that cement is quick hardening sulphoaluminate
425 cement.
4. a kind of injecting paste material of cement mortar according to claim 1, which is characterized in that water is with cement weight ratio
(0.48~0.50):1, quartz sand and cement weight ratio are (0.5~1):1.
5. a kind of injecting paste material of cement mortar according to claim 1, which is characterized in that water is with cement weight ratio
(0.46~0.50):1, quartz sand and cement weight ratio are (0.8~1):1.
6. a kind of injecting paste material of cement mortar according to claim 1, which is characterized in that water is with cement weight ratio
(0.48~0.50):1, quartz sand and cement weight ratio are (0.8~1):1.
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| CN201810570022.XA CN108585713A (en) | 2018-06-05 | 2018-06-05 | A kind of injecting paste material of cement mortar |
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| CN201810570022.XA CN108585713A (en) | 2018-06-05 | 2018-06-05 | A kind of injecting paste material of cement mortar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578021A (en) * | 2018-11-29 | 2019-04-05 | 长安大学 | A kind of economical high-strength fast grouting strengthening method of injecting paste material and soft rock tunnel firmly |
| CN111848028A (en) * | 2020-07-01 | 2020-10-30 | 太原理工大学 | Composite grouting material for weak fractured rock mass and preparation method thereof |
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| CN103265253A (en) * | 2013-05-08 | 2013-08-28 | 沈阳建筑大学 | High-performance grouting material for prefabricated building construction, and preparation method thereof |
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| CN105198347A (en) * | 2015-09-29 | 2015-12-30 | 西安理工大学 | Early strength and fast hardening type rock filling and grouting recycled concrete and production method thereof |
| CN105604338A (en) * | 2015-12-21 | 2016-05-25 | 中国铁道科学研究院铁道建筑研究所 | Cement-based anchoring glue construction technology |
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| CN101157537A (en) * | 2007-08-02 | 2008-04-09 | 铁道科学研究院铁道建筑研究所 | Rapid-hardening self-leveling mortar material |
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| CN103265253A (en) * | 2013-05-08 | 2013-08-28 | 沈阳建筑大学 | High-performance grouting material for prefabricated building construction, and preparation method thereof |
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Application publication date: 20180928 |