CN108751884A - A kind of low-temperature nano complex cement - Google Patents
A kind of low-temperature nano complex cement Download PDFInfo
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- CN108751884A CN108751884A CN201810833520.9A CN201810833520A CN108751884A CN 108751884 A CN108751884 A CN 108751884A CN 201810833520 A CN201810833520 A CN 201810833520A CN 108751884 A CN108751884 A CN 108751884A
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- cement
- complex cement
- silicate
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- aluminium sulfate
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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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
- 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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of low-temperature nano complex cements, including：Portland cement and sulphate aluminium cement, calcium chloride, SiO2, lithium carbonate Li2CO3With water-reducing agent JSS；Portland cement and sulphate aluminium cement are with 4:6 silicate-aluminium sulfate complex cement than reassembling into；Calcium chloride：Dosage is the 2-5% of silicate-aluminium sulfate complex cement；Complex cement basal liquid is obtained after silicate-aluminium sulfate complex cement and calcium chloride mixing；SiO2：Dosage is the 0.1-0.4% of complex cement basal liquid；Lithium carbonate Li2CO3：Dosage is complex cement basal liquid：0.03-0.05%；Water-reducing agent JSS：Dosage is the 0.5-0.7% of complex cement basal liquid；The complex cement basal liquid ratio of mud is 0.5-0.6.The advantage of the invention is that：With frost resistance, initial viscosity is low, good fluidity；The pumpable phase is adjustable, and first final set interval time is short；It is cheap, environmental protection；Cement grout stability is good, and calculus rate is high.
Description
Technical field
The present invention relates to retaining wall leakage stopping technology field, more particularly to a kind of low-temperature nano complex cement.
Background technology
With flourishing for China's economy, western engineering construction construction and the exploration and development of mineral resources have deeper
The progress entered.There are a large amount of permanent freezing layers, frozen soil formation condition is complicated for western China.The part well section in drilling process
Structure development, interbedding of soft and hard rocks, rock mass loose crushing, water sensitivity are strong, and especially steep dip crack is that severe mud losses create condition, from
And phenomena such as causing hole collapse, undergauge and slurries to be missed, is frequent.Retaining wall leak stopping is the very severe faced in frozen soil probing
Realistic problem, carry out for frozen soil probing retaining wall leak stopping research work it is extremely urgent.Retaining wall is carried out using drilling fluid at present
Leak stopping still has several drawbacks place, there is an urgent need for exploring new retaining wall plugging material, and with Low temperature drilling fluid, casing retaining wall leak stopping side
Method matches, and establishes a whole set of retaining wall blocking method system, solves the retaining wall leak stopping problem during frozen soil probing.
Currently, it is a kind of traditional and important method to carry out retaining wall leak stopping using cement-based material, bad ground is being solved
Retaining wall leak stopping in terms of there is certain superiority, but its there is also some defects.Such as the first end of Portland cement
The solidifying time is long, and early anti pressured intension is low, and scour resistance is poor, causes retaining wall plugging effect difference what is more its retaining wall may be not achieved and is stifled
Leak purpose；Sulphate aluminium cement has rapid hardening, early strong feature, and has certain frost resistance, is suitable for repairing and cryogenic engineering,
But sulphate aluminium cement is drilled into retaining wall leak stopping for frozen soil, the Key Performance Indicators such as slurries rheological characteristic, setting time are often
Requirement is cannot be satisfied, and the problem of there is also high expensives.
Invention content
The present invention in view of the drawbacks of the prior art, provides a kind of low-temperature nano complex cement, can effectively solve the problem that above-mentioned
Problem of the existing technology.
In order to realize the above goal of the invention, the technical solution adopted by the present invention is as follows：
A kind of low-temperature nano complex cement, the nano combined cement include following material：
Water, Portland cement (P.O42.5), sulphate aluminium cement (R.SAC42.5), calcium chloride, nano material
SiO2, early strength agent lithium carbonate Li2CO3With water-reducing agent JSS；
Portland cement (P.O42.5) and sulphate aluminium cement (R.SAC42.5) are with 4:6 silicic acid than reassembling into
Salt-aluminium sulfate complex cement；
Antifreezing agent calcium chloride：Dosage is the 2-5% of silicate-aluminium sulfate complex cement total weight；
After silicate-aluminium sulfate complex cement and calcium chloride mixing complex cement basal liquid is obtained with water mix；
The complex cement basal liquid ratio of mud is：0.5-0.6.
Nano material SiO2：Dosage is the 0.1-0.4% of silicate-aluminium sulfate complex cement weight；
Early strength agent lithium carbonate Li2CO3：Dosage is silicate-aluminium sulfate complex cement weight：0.03-0.05%；
Water-reducing agent JSS：Dosage is the 0.5-0.7% of silicate-aluminium sulfate complex cement weight.
Preferably, antifreezing agent calcium chloride：Dosage is the 4% of silicate-aluminium sulfate complex cement；
Preferably, nano material SiO2：Dosage is the 0.1% of silicate-aluminium sulfate complex cement weight；
Preferably, early strength agent lithium carbonate Li2CO3：Dosage is the 0.05% of silicate-aluminium sulfate complex cement weight；
Preferably, water-reducing agent JSS：Dosage is the 0.5% of silicate-aluminium sulfate complex cement weight；
Preferably, the complex cement basal liquid ratio of mud is 0.55.
Compared with prior art the advantage of the invention is that：
(1) there is frost resistance, (- 10 DEG C) slurries initial viscosity is low under room temperature and low temperature, mobility and rheological characteristic are good；
(2) the pumpable phase is adjustable (30-50min), and first final set interval time is short；
(3) slurries are adding water mix viscosity build early period slow, good fluidity, reach flowing failure speed after certain time point
Become larger, viscosity increases rapidly, and fluidity is reduced rapidly to 140mm or less；
(4) cheap, environmental protection；
(5) cement grout stability is good, and calculus rate is high, cement calculus for 24 hours compression strength in 10MPa or more.
Description of the drawings
Fig. 1 is 1 nano combined cement fluidity curve graph of the embodiment of the present invention；
Fig. 2 is 1 cement grout setting time comparison diagram of the embodiment of the present invention；
Fig. 3 is 1 nano combined strength of cement growth trend figure of the embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, by the following examples, to the present invention do into
One step is described in detail.
Embodiment 1
A kind of low-temperature nano complex cement, the nano combined cement include following material：
Portland cement (P.O42.5) and sulphate aluminium cement (R.SAC42.5) are with 4:6 silicic acid than reassembling into
Salt-aluminium sulfate complex cement；
Antifreezing agent calcium chloride：Dosage is the 4% of silicate-aluminium sulfate complex cement；
Silicate-aluminium sulfate complex cement and calcium chloride mixing, and obtain complex cement basal liquid after water mix；
Nano material SiO2：Dosage is the 0.1% of silicate-aluminium sulfate complex cement weight；
Early strength agent lithium carbonate Li2CO3：Dosage is the 0.05% of silicate-aluminium sulfate complex cement weight；
Water-reducing agent JSS：Dosage is the 0.5% of silicate-aluminium sulfate complex cement weight；
The complex cement basal liquid ratio of mud is 0.55.
Nano combined cement cryogenic property is tested below, it was demonstrated that it is with outstanding cryogenic property；
Fluidity and pumpable phase
After preparing cement grout according to test method, its fluidity is measured at regular intervals, until cement
Slurries fluidity is less than 14cm, it is believed that cement grout at this time loses pumpability, from add water mix to when losing this section of pumpability
Between i.e. cement grout the pumpable phase.Test result is as shown in Figure 1.
Analysis chart 1 can be obtained to draw a conclusion：
(1) the initial flow degree of nano combined cement base retaining wall plugging material is preferable, reaches 24cm, meets to low temperature retaining wall
The requirement (initial flow degree 200-250mm) of plugging material, since with water mix, as time went on, the fluidity of material
A relatively stable value is remained essentially in, the amplitude very little that fluidity reduces (can be maintained on 20cm, every ten minutes
Fluidity reduces amplitude and is less than 2cm), the slope of curve is held essentially constant；After 30min, fluidity change curve slope is prominent
So increase, fluidity strongly reduces, and the flowing failure speed of cement grout is accelerated suddenly, and slurries are quickly thickened；When reaching 52min
When left and right, cement grout flowing degree is reduced to 14cm, therefore can show that the low-temperature nano complex cement pumpable phase is 54min, full
The performance requirement (30-50min) of sufficient low temperature retaining wall plugging material.
(2) fluidity of low-temperature nano complex cement changes over time trend and is similar to right angle, its fluidity is changed special
Property be known as " short transient time ", this unique hydration characteristics is conducive to borehole wall-protection leak stopping.Adding water mix early period, cement grout
It with preferable mobility, is flowed conducive in ground layer gap, is sufficient filling with stratum crack；When cement grout in the earth formation have compared with
After big mobile radius, slurries are thickened rapidly, can reach retaining wall plugging effect to a certain extent.Using nano combined cement this
Special nature makes excellent performance of the nano combined cement with controllable rheology by adjusting additive dosage.The nanometer studied
Complex cement base retaining wall plugging material reflected typical " short transient time " be characterized as carrying out the retaining wall of frozen soil bad ground
Good basis has been established in leak stopping.
Setting time
Frozen soil drills met formation condition complexity, and phenomena such as hole collapse, undergauge and slurries leakage is frequent when probing, at any time
There is the risk of burying.Therefore it is required that its setting time of retaining wall plugging material is shorter, it can achieve the purpose that stable hole wall in a short time.
Experiment is put into after preparing portland cement slurries, sulphate aluminium cement slurries and nano combined cement respectively
Numerical control Cord blood case (- 10 DEG C) under same low temperature environment tests its setting time.Test result is as shown in Figure 2.
As can be seen from Figure 2 under -10 DEG C of low temperature environments portland cement slurries and sulphate aluminium cement slurries condensation
Time is longer, and (the Portland cement slurries presetting period reaches 525min, final setting time 803min；Sulphate aluminium cement is starched
The liquid presetting period is 374min, final setting time 553min), and just final setting time interval is longer.Nano combined cement base retaining wall
The setting time of plugging material formula substantially reduces compared to both the above cement, and the presetting period is reduced to 100min or so, final set
Time is reduced to 140min or so, reaches rapid curing after pre-hardening state and reaches final set state, first final setting time interval is only
46min.This has good retaining wall plugging effect for the serious stratum that is crushed, collapses.
Compression strength
The compression strength of cement grout Seed harvest is to weigh an essential index of retaining wall plugging material performance.Water
The influence factor of mud calculus compression strength includes mainly：Cement type, the ratio of mud, the porosity of calculus, additive, care environments
And curing age etc..Compression strength reaches 3MPa or more to Frozen Ground Area drilling requirements retaining wall plugging material after 24h.According to mark
Quasi- test method prepares cement sample, be put into numerical control Cord blood case conserve for 24 hours, 48h, 72h, to after specified curing age
It takes out and carries out compression test test, test result is as shown in Figure 3.
From Fig. 3 it can be seen that, nano combined cement in numerical control Cord blood case low temperature reservation for 24 hours after, cement calculus resistance to compression
Intensity has reached 10MPa or more (compression strength is 11.2MPa for 24 hours)；The increasing degree of same time period compression strength is different,
The compression strength for arriving 48h cement calculus for 24 hours increases 3.3MPa (reaching 14.5MPa), 48h to 72h cement calculus compression strength
0.8MPa (reaching 15.3MPa) is increased, thus can also prove that complex cement hydration and hardening early period rate is larger, with the time
Extend and slow down, leading portion trend line slope is shown as in figure and is more than back segment, illustrates to compare for the previous period in same time period
It is big in rear a period of time compression strength increasing degree.According to the anti-of compression strength growth trend figure low-temperature nano complex cement
Compressive Strength meets Frozen Ground Area probing retaining wall leak stopping requirement.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright implementation, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.Ability
The those of ordinary skill in domain can make its various for not departing from essence of the invention according to the technical disclosures disclosed by the invention
Its various specific variations and combinations, these variations and combinations are still within the scope of the present invention.
Claims (6)
1. a kind of low-temperature nano complex cement, which is characterized in that the nano combined cement includes following material：
Water, Portland cement (P.O42.5), sulphate aluminium cement (R.SAC42.5), calcium chloride, nano material SiO2, it is early
Strong agent lithium carbonate Li2CO3With water-reducing agent JSS；
Portland cement (P.O42.5) and sulphate aluminium cement (R.SAC42.5) are with 4:6 silicate-sulphur than reassembling into
Aluminate complex cement；
Antifreezing agent calcium chloride：Dosage is the 2-5% of silicate-aluminium sulfate complex cement total weight；
After silicate-aluminium sulfate complex cement and calcium chloride mixing complex cement basal liquid is obtained with water mix；
The complex cement basal liquid ratio of mud is：0.5-0.6；
Nano material SiO2：Dosage is the 0.1-0.4% of silicate-aluminium sulfate complex cement weight；
Early strength agent lithium carbonate Li2CO3：Dosage is silicate-aluminium sulfate complex cement weight：0.03-0.05%；
Water-reducing agent JSS：Dosage is the 0.5-0.7% of silicate-aluminium sulfate complex cement weight.
2. a kind of low-temperature nano complex cement according to claim 1, it is characterised in that：Antifreezing agent calcium chloride：Dosage is
The 4% of silicate-aluminium sulfate complex cement.
3. a kind of low-temperature nano complex cement according to claim 2, it is characterised in that：Nano material SiO2：Dosage is silicon
The 0.1% of hydrochlorate-aluminium sulfate complex cement weight.
4. a kind of low-temperature nano complex cement according to claim 3, it is characterised in that：Early strength agent lithium carbonate Li2CO3：Add
Amount is the 0.05% of silicate-aluminium sulfate complex cement weight.
5. a kind of low-temperature nano complex cement according to claim 4, it is characterised in that：Water-reducing agent JSS：Dosage is silicic acid
The 0.5% of salt-aluminium sulfate complex cement weight.
6. according to a kind of low-temperature nano complex cement described in claim 1 to 5, it is characterised in that：Complex cement basal liquid water
Gray scale is 0.55.
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| CN201810833520.9A CN108751884A (en) | 2018-07-26 | 2018-07-26 | A kind of low-temperature nano complex cement |
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| CN201810833520.9A CN108751884A (en) | 2018-07-26 | 2018-07-26 | A kind of low-temperature nano complex cement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627461A (en) * | 2019-10-30 | 2019-12-31 | 安徽海螺建材设计研究院有限责任公司 | Ultrahigh-performance concrete applied to high-cold area and preparation method thereof |
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| CN102276218A (en) * | 2011-05-20 | 2011-12-14 | 中国铁道科学研究院铁道建筑研究所 | Low negative temperature post-tensioned beam prestress pipeline mudjacking material |
| CN102701679A (en) * | 2012-06-13 | 2012-10-03 | 江苏建华新型墙材有限公司 | Antifreeze ready mixed mortar and preparation method thereof |
| CN105859227A (en) * | 2016-04-01 | 2016-08-17 | 成都理工大学 | High-early strength nano-composite cement-based water shutoff reinforcing material |
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2018
- 2018-07-26 CN CN201810833520.9A patent/CN108751884A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276218A (en) * | 2011-05-20 | 2011-12-14 | 中国铁道科学研究院铁道建筑研究所 | Low negative temperature post-tensioned beam prestress pipeline mudjacking material |
| CN102701679A (en) * | 2012-06-13 | 2012-10-03 | 江苏建华新型墙材有限公司 | Antifreeze ready mixed mortar and preparation method thereof |
| CN105859227A (en) * | 2016-04-01 | 2016-08-17 | 成都理工大学 | High-early strength nano-composite cement-based water shutoff reinforcing material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627461A (en) * | 2019-10-30 | 2019-12-31 | 安徽海螺建材设计研究院有限责任公司 | Ultrahigh-performance concrete applied to high-cold area and preparation method thereof |
| CN110627461B (en) * | 2019-10-30 | 2021-12-24 | 安徽海螺建材设计研究院有限责任公司 | Ultrahigh-performance concrete applied to high-cold area and preparation method thereof |
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Application publication date: 20181106 |