CN104909647B - A kind of preparation method of morning age high moisturizing concrete - Google Patents
A kind of preparation method of morning age high moisturizing concrete Download PDFInfo
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- CN104909647B CN104909647B CN201510260267.9A CN201510260267A CN104909647B CN 104909647 B CN104909647 B CN 104909647B CN 201510260267 A CN201510260267 A CN 201510260267A CN 104909647 B CN104909647 B CN 104909647B
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Abstract
The invention discloses a kind of preparation methods of high moisturizing concrete of early age.By nine kinds of cement, flyash, miberal powder, coagulant liquid, water, water-reducing agent, swelling agent, river sand and rubble raw materials through mix, pour, conserve.Added coagulant liquid possesses high water absorption, high water conservation, controllable Characteristic of releasing moisture, has a large amount of water absorbing capacities, and can keep largely absorbing water point during concrete mixing, can gradually discharge when inside concrete relative humidity declines and absorb water point in maintenance processes.Releasing the inside maintenance action of water formation can make inside concrete core internal relative humidity begin to decline the time than conventional concrete delay 2 ~ 3 days, internal relative humidity can maintain more than 90% before 7 days, can preferably inhibit the early-age shrinkage cracking of high-strength high-performance concrete.High moisturizing concrete produced by the present invention has splendid crack resistance and frost resistance, has wide application prospects in the concrete structure of difficult curing concrete structure or component, strong wind area and high-moisture evaporation area.
Description
Technical field
The present invention relates to a kind of preparation methods of high moisturizing concrete of early age, belong to building material technical field.
Background technology
High performance concrete is the 80s and 90s in last century to be based on durability design by some developed countries
And a kind of modern concrete proposed, it has high intensity, preferable application property using structure durability as primary design object
Many advantages, such as energy and durable height.
In order to obtain higher-strength, compared with compact texture and preferable working performance, high performance concrete has in terms of material
Following characteristics：Gel material content is higher, largely using mineral admixture（Flyash, slag or silicon ash）And high efficiency water reducing agent.
Famous American scholar Powers points out that the theoretical ratio of mud of silicate cement hydration should be not less than 0.42.But high efficiency water reducing agent
With the use of active mineral admixture so that the actual ratio of mud of high performance concrete is often less than 0.27 and less, causes to mix
Water consumption deficiency in solidifying soil.Due in concrete without adequate water for the complete aquation of cement, moisture largely steams in internal capillary hole
Hair, internal relative humidity decline, and pore is shunk, and occurs so-called " self-desiccation " phenomenon before 3d.Because under internal relative humidity
" self-desiccation " generated is dropped, gently then causes occur a large amount of microcracks inside high performance concrete, it is heavy then cause high performance concrete
There is penetrability macrocrack.Crack invades high performance concrete for environmental etch medium and provides passage, becomes concrete
The hidden danger of deterioration, long-run development necessarily cause the durability damage of concrete works structure.Therefore, from internal relative humidity
The generation and development of early cracks of concrete are controlled, is the important outlet for truly realizing concrete high-performance.
For because of design reasons interior humidity decline being made to cause high performance concrete early-age crack, because of external environment
Such as wind speed, temperature, humidity acute variation cause concrete early-age plastic cracking also extremely common.Research shows when environment temperature
When degree, envionmental humidity are identical, wind speed often increases 10km/h, and moisture evaporation rate is increased by one times；When environment temperature, wind speed
When identical, envionmental humidity often reduces half, and moisture evaporation rate also doubles.In NORTHWEST CHINA part Extreme Dry nonirrigated farmland
Area, annual envionmental humidity is less than 10% and annual mean wind speed is more than 62km/h（Eight grades or more）Number of days in more than 150d；
In southern area, summer temperature is often at 38 DEG C or more.In severe environmental conditions such as low environment relative humidity, high wind speed and high temperature
Under, after concreting in the plastic state（2~6h）Crack.It is not main reason is that external environment humid control is tight, i.e.,
After concrete surface is more than inside concrete to surface water supply rate to air rate-of-loss of coolant, external environment can not provide enough
Moisture maintains surface to be sufficiently humidified so as to, and slurry surface shrinkage cracking occurs.As it can be seen that for normal concrete, remain internal wet
What maintains external moistening to have property of equal importance to profit.
Concrete totality water deficient or moisture excessively scatter and disappear too early the main reason for being concrete bracing, therefore logical
It is very crucial to cross the inside and outside humidity for keeping the skin wet and controlling moisture loss, maintenance relatively high.Patent one《Concrete curing
Device and tower crane》(CN201410544880.9) led to using the tower crane for carrying more nozzle conveying pipeline devices come curing concrete
The method for crossing the regular sprinkle water and spray of nozzle maintains concrete surface moistening, is similar to water spray, watering maintenance.The maintenance process can
To realize the regular surface maintenance to large-area planar structure.But it still belongs to conventional surface maintenance, it can not be to inside concrete
It is conserved, is unsuitable for low water binder ratio and the relatively high high performance concrete of compactness.Special tower crane need to be equipped with, and tower crane needs
In-site installation, use occasion is severely limited, and nonplanar structure can not be conserved effectively.Patent two《Water-base liquid film-type mixes
Concrete curing agent》(CN02111497.8) method blocked using film forming realizes concrete surface maintenance, and principle is poured newly
Concrete surface sprays one layer of liquid film forming curing agent, and one layer of fluid-tight sealing is gradually formed in concrete surface after spraying
Film, due to the effect of blocking of film, surface moisture can not be lost in air, be preserved in concrete surface, so as to reach control
The purpose of control surface moistening.The method is similar to covering（Package）Plastic film conserves or curing in water, and advantage is from construction site
It is limited with Components Shape, to greatest extent concrete surface can be kept to moisten.But there are curing agent is of high cost, demoulding is not thorough influence
The problems such as architectural appearance.Patent three《A kind of intelligent shrinkage reducing agent for concrete and its preparation method and application》
(CN200810197062.0) concrete shrinkage is improved using economization agent.The method is that a kind of surface-active substance is added in concrete
Matter, when concrete forms capillary tension due to dry in pore makes concrete shrinkage, because the presence of economization agent makes
It obtains capillary tension to decline so that the macroshrinkage value of concrete reduces, and concrete is controlled by reducing the contraction of concrete
Interior humidity.But there are the problems such as of high cost, reduction intensity and poor compatibility for it.By to having the advantages of method and patent
And shortcoming is compared, and is found in time, reasonably to supplement the moisture inside Behavior of Hardened Cement Paste, is increased the side of inside concrete relative humidity
Method may be to solve the problems, such as this fundamental solution.
The content of the invention
The object of the present invention is to provide a kind of early ages（In 7 days）The preparation method of high moisturizing concrete, by stirring
A kind of gel through absorbing water in advance is added in into concrete in the process, using equally distributed water absorbent gel under proper condition not
Water is discontinuously released, moisture is provided to concrete from inside, it is this interior so as to the internal relative humidity for maintaining concrete higher in early days
Maintenance action can inhibit concrete bracing.
To achieve the above object, the invention used a kind of high water absorbing capacity be, high water retention, realizing controlled-release water it is solidifying
Colloidal starch graft copolymer material, and comminuted processing has been carried out before concrete is added in gel-like material, and use
Liquid and unconventional powdered incorporation method is reduced while early-age crack is inhibited to greatest extent to hardening coagulation
The adverse effect of native paste structure.
It concretely comprises the following steps：
（1）High moisturizing concrete is by cement, flyash, miberal powder, coagulant liquid, water, water-reducing agent, swelling agent, river sand and rubble
Nine kinds of component compositions, each component mass percent are respectively：Cement 8.5% ~ 17.5%, flyash 1.5% ~ 4.0%, miberal powder 1.5% ~
4.0%th, coagulant liquid 0.5% ~ 1.5%, water 5.0% ~ 8.0%, water-reducing agent 0.1% ~ 0.5%, swelling agent 0.5% ~ 2.5%, river sand 30.0% ~
35.0%th, the sum of rubble 40% ~ 55%, each component mass percent is 100%.
（2）Coagulant liquid presses 1 by gel and water:14 ratios are prepared, and gel is in new high moisturizing coagulation after mixing and stirring hardening in order to control
Size in soil, gel are stirred using band shear blade before preparing and form within 5 ~ 10 minutes microgel, and microgel saturation water suction 36 ~
48 it is small when after form coagulant liquid.
（3）By step（1）Rubble, river sand are added in mixer, dry mixing 10 ~ 15 seconds by raw material proportioning；Then by cement, ore deposit
Powder, flyash, swelling agent add in mixer, continue dry mixing 10 ~ 15 seconds；Then by water-reducing agent, water and step（2）Gained coagulant liquid
Mixer is added in, wet-mixing obtains mixture in 3 ~ 5 minutes；Mixture through pouring molding, vibrate, conserve, mixed after 7 days up to high moisturizing
Solidifying soil.Gel is mixed with powder type after aqueous solution rather than drying, it is ensured that and microgel is fully dispersed in concrete, and then
Reach the purpose of whole interior maintenance moisturizing.
The cement is P.O42.5 cement.
The flyash be II grade of flyash, 320 ~ 480m of specific surface area2/kg。
The miberal powder is S95 grades, 390 ~ 480m2/kg。
The water-reducing agent be ethers polycarboxylic acid water reducing agent, water-reducing rate 20% ~ 25%.
The swelling agent main component is calcium sulphoaluminate.
The river sand be middle sand, modulus of fineness 2.6 ~ 2.8.
The rubble is 5 ~ 31.5mm continuous gradings.
The gel is starch graft acrylamide analog copolymer, sucks 180 ~ 280 times of ion outlet capacity, water retention 80% ~
95%, negative pressure releases water rate 75% ~ 82%.
Table 1 is adds in and is added without coagulant liquid concrete from being molded into the 7th day internal relative humidity situation of change, test specimen
Size is 100 × 100 × 515mm.
Table 1：Add in and be added without the comparison of coagulant liquid inside concrete relative humidity
As it can be seen that compared to general concrete, early age high moisturizing concrete center internal relative humidity is begun to decline
Time delay 2 ~ 3 days, and 7 days whens remain to maintain more than 90%, so that it is guaranteed that concrete spends cracking critical days.Fully prove,
Inside concrete relative humidity can be dramatically increased using a small amount of water absorbent gel.In addition, because dosage is few, particle is small, residual is also
It is few, very little is influenced on maturing pore structure after releasing water.Although concrete pore rate adds 2% ~ 4%, average pore size
Have dropped 5 ~ 6nm.Make concrete that not only there is higher early age relative humidity, also with a large amount of closed porosities, added water suction is solidifying
The microporous improved effect of the glue frost resistance of concrete.
Water absorbent gel maintains the mechanism of higher interior humidity to be, gel sheet has three-dimensional as starch graft copolymer
Mesh space structure.It can not only rely on the hydrophilic interaction of itself functional group to absorb moisture, can also pass through abundant network structure
Store moisture.Specific function group and structure possess it to preserve its ability to absorb water point as far as possible in strong basicity environment,
Network structure is present in low combination power by and in most of moisture, has what after interior humidity reduction release absorbed water point
Function.The high water retention characteristic of gel so that moisture need not participate in hydration reaction in the early hydration stage in gel, and when in system
When free moisture is reduced so that internal relative humidity is down to a certain degree, moisture is just discharged, maintenance system is sufficiently humidified so as to.
In whole process of the present invention, gel " external water source " preset as one, with inside concrete hydrated cementitious
It carries out, after raw wool pore " internal water source " water consumption, the moisture absorbed in gel is gradually released in Behavior of Hardened Cement Paste nearby, is made
Pore keeps higher relative humidity, and meniscus is then less prone in pore, effectively increases the early stage cracking resistance of concrete
Property, so as to fulfill this high moisture-keeping function of early age.
Specific embodiment
Make further specific detailed description, but embodiments of the present invention are not to the present invention with reference to specific embodiment
It is limited to this, for especially not dated technological parameter, can refer to routine techniques progress.
Embodiment 1：
（1）Dosage is as follows in a kind of morning age high moisturizing concrete, component and every cubic meter of concrete：Cement 175kg,
Flyash 40kg, miberal powder 110kg, river sand 848kg, rubble 1010kg, coagulant liquid 20kg, water-reducing agent 4.88kg, swelling agent 28kg,
Water 152kg.
（2）By polymer gel and water with 1:14 ratios are allocated, and stir 5 minutes with band shear blade, then saturation
Absorb water 48 it is small when obtain coagulant liquid.
（3）By step（1）Rubble, river sand are added in mixer, dry mixing 15 seconds by raw material proportioning；Again by cement, miberal powder, fine coal
Ash, swelling agent add in mixer, continue dry mixing 15 seconds；Then by water-reducing agent, water and step（2）Gained coagulant liquid adds in stirring
Machine, wet-mixing obtains mixture in 5 minutes；Mixture through pouring molding, vibrate, conserve, up to high moisturizing concrete after 7 days.
The cement is P.O42.5 cement.
The flyash be II grade of flyash, specific surface area 461m2/kg。
The miberal powder is S95 grades, than table 472m2/ kg, activity index 98%.
The water-reducing agent be ethers polycarboxylic acid water reducing agent, water-reducing rate 22%.
The swelling agent is calcium sulphoaluminate.
The river sand be middle sand, modulus 2.5.
The rubble be 5 ~ 31.5mm continuous gradings, crush values 10.0%.
The polymer gel be starch graft acrylamide -2- acrylamide-2-methyl propane sulfonic copolymers, suck from
Sub- 276 times of outlet capacity, water retention 86.5%, negative pressure releases water rate 81%.
The water is tap water.
Gained morning age high moisturizing concrete seven day is with front surface without cracking phenomena.Intensity reaches design requirement, and the 20 of sampling
28 days mean intensities of group concrete sample are 26.5MPa.Intensity respectively reaches for 60 days, 90 days also in accelerated growth before 90 days
32.6MPa、35.5MPa。
Embodiment 2：
（1）Dosage is as follows in a kind of morning age high moisturizing concrete, component and every cubic meter of concrete：Cement 230kg,
60 kg of flyash, 60 kg of miberal powder, 785 kg of river sand, 1055 kg of rubble, 20 kg of coagulant liquid, 7.5 kg of water-reducing agent, swelling agent
30 kg, 175 kg of water.
（2) by polymer gel and water with 1:14 ratios are allocated, and stir 3 minutes with band shear blade, then saturation
Absorb water 48 it is small when obtain coagulant liquid
(3) step is pressed（1）Rubble, river sand are added in mixer, dry mixing 15 seconds by raw material proportioning；Again by cement, miberal powder, fine coal
Ash, swelling agent add in mixer, continue dry mixing 15 seconds；Then coagulant liquid and water are added in into mixer, wet-mixing obtains mix in 5 minutes
Object；Mixture through pouring molding, vibrate, conserve, up to high moisturizing concrete after 7 days.
The cement is P.O42.5 cement.
The flyash be II grade of flyash, specific surface area 461m2/ kg, 0.045mm square hole screen are tailed over as 20%, loss on ignition
For 8%.
The miberal powder is S95 grades, specific surface area 465m2/ kg, activity index 98%.
The water-reducing agent be ethers polycarboxylic acid water reducing agent, water-reducing rate 22%.
The swelling agent main component is calcium sulphoaluminate.
The river sand be middle sand, modulus 2.7.
The rubble be 5 ~ 31.5mm continuous gradings, crush values 10.2%.
The polymer gel be starch graft acrylamide -2- acrylamide-2-methyl propane sulfonic copolymers, suck from
Sub- 268 times of outlet capacity, water retention 84.5%, negative pressure releases water rate 80.6%.
The water is tap water.
Gained morning age high moisturizing concrete seven day is with front surface without cracking phenomena.Intensity reaches design requirement, and the 20 of sampling
Group concrete sample 28 days, 60 days, 90 days mean intensities be respectively 34.5MPa, 40.6MPa, 43.5MPa.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention and from the embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (1)
1. a kind of preparation method of morning age high moisturizing concrete, it is characterised in that concretely comprise the following steps：
（1）High moisturizing concrete is by nine kinds of cement, flyash, miberal powder, coagulant liquid, water, water-reducing agent, swelling agent, river sand and rubble
Component forms, and each component mass percent is respectively：Cement 8.5% ~ 17.5%, flyash 1.5% ~ 4.0%, miberal powder 1.5% ~ 4.0%,
Coagulant liquid 0.5% ~ 1.5%, water 5.0% ~ 8.0%, water-reducing agent 0.1% ~ 0.5%, swelling agent 0.5% ~ 2.5%, river sand 30.0% ~ 35.0%,
The sum of rubble 40% ~ 55%, each component mass percent is 100%；
（2）Coagulant liquid presses 1 by gel and water:14 ratios are prepared, and gel uses band shear blade to stir 5 ~ 10 points before preparing
It is bell into microgel, when microgel saturation water suction 36 ~ 48 is small after form coagulant liquid；
（3）By step（1）Rubble, river sand are added in mixer, dry mixing 10 ~ 15 seconds by raw material proportioning；Then by cement, miberal powder, powder
Coal ash, swelling agent add in mixer, continue dry mixing 10 ~ 15 seconds；Then by water-reducing agent, water and step（2）Gained coagulant liquid adds in
Mixer, wet-mixing obtain mixture in 3 ~ 5 minutes；Mixture through pouring molding, vibrate, conserve, up to high moisturizing coagulation after 7 days
Soil；
The cement is P.O42.5 cement；
The flyash be II grade of flyash, 320 ~ 480m of specific surface area2/kg；
The miberal powder is S95 grades, 390 ~ 480m2/kg；
The water-reducing agent be ethers polycarboxylic acid water reducing agent, water-reducing rate 20% ~ 25%；
The swelling agent is calcium sulphoaluminate；
The river sand be middle sand, modulus of fineness 2.6 ~ 2.8；
The gel is starch graft acrylamide analog copolymer, sucks 180 ~ 280 times of ion outlet capacity, water retention 80% ~ 95%,
Negative pressure releases water rate 75% ~ 82%；
The rubble is 5 ~ 31.5mm continuous gradings.
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| CN107417203B (en) * | 2017-06-27 | 2019-08-20 | 黄河勘测规划设计研究院有限公司 | A kind of moisturizing self-maintenance concrete pouring material |
| CN107443553A (en) * | 2017-09-19 | 2017-12-08 | 德阳顺辉建材有限公司 | A kind of rapid curing method for concrete brick |
| CN107721242A (en) * | 2017-11-28 | 2018-02-23 | 王德元 | A kind of rapid hardening gunite concrete |
| CN109095850B (en) * | 2018-08-25 | 2021-07-20 | 北京建工新型建材有限责任公司 | High-early-strength concrete mixture and winter construction method thereof |
| CN109987899A (en) * | 2019-04-17 | 2019-07-09 | 桂林理工大学 | It is a kind of with reinforcement, it is interior maintenance and compensation contractile function preparation method of concrete |
| CN111620617A (en) * | 2020-04-24 | 2020-09-04 | 山东大学 | Ultrahigh-performance cement-based composite material for sensor, sensor and preparation method |
| CN116496030A (en) * | 2022-01-18 | 2023-07-28 | 中国石油天然气集团有限公司 | Cement paste system suitable for cement plugs of high-inclination sections and horizontal sections and preparation method thereof |
| CN114290531B (en) * | 2022-01-24 | 2024-02-09 | 太原理工大学 | Rapid prewetting device and process with efficient water-absorbing ceramsite |
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