CN107721226A - It is a kind of to be prewetted duration control method rich in brick regenerated coarse aggregate - Google Patents

It is a kind of to be prewetted duration control method rich in brick regenerated coarse aggregate Download PDF

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Publication number
CN107721226A
CN107721226A CN201711156318.9A CN201711156318A CN107721226A CN 107721226 A CN107721226 A CN 107721226A CN 201711156318 A CN201711156318 A CN 201711156318A CN 107721226 A CN107721226 A CN 107721226A
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coarse aggregate
brick
regenerated coarse
rich
aggregate
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CN107721226B (en
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郭利霞
钟凌
郭磊
田园
武潇
孙文
卓佐昊
赵鸣
赵一鸣
欧昌雪
杨絮
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North China University of Water Resources and Electric Power
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North China University of Water Resources and Electric Power
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10Coating or impregnating
    • C04B20/1055Coating or impregnating with inorganic materials
    • C04B20/1088Water
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The present invention provides a kind of control method for time of being prewetted rich in brick regenerated coarse aggregate, according to the demand rich in brick regenerated coarse aggregate different saturation, to being prewetted rich in brick regenerated coarse aggregate, avoid the time of prewetting rich in brick regenerated coarse aggregate oversize, occupancy is prewetted place, lose time, reduce production efficiency;It is too short not reach rich in the requirement of brick regenerated coarse aggregate saturation degree.

Description

It is a kind of to be prewetted duration control method rich in brick regenerated coarse aggregate
Technical field
Prewetted the present invention relates to aggregate the control method of time, more particularly to the control for time of prewetting rich in brick regenerated coarse aggregate Method processed.
Background technology
Regeneration aggregate is the important component of regeneration concrete, can solve stacking, occupation of land of discarded building waste etc. and ask Topic, there is significant society, economy and environmental benefit, be a kind of construction material of sustainable development.
Regeneration aggregate is classified with reference to normal concrete, is coarse aggregate more than more than 5mm, is fine aggregate less than 5mm, more From the waste and old building waste removed in Process of Urbanization Construction, using wherein concrete and masonry remains fragment, by one The processing of series forms.Building rubbish discarded concrete difficult to realize is kept completely separate with useless brick, due to made of useless fragment of brick Regeneration brick aggregate has the characteristics that low intensity, porosity are big, water absorbing capacity is strong so that the regeneration concrete performance being made from it is big Width declines, and research shows:With the increase for brick content of being given up in regeneration aggregate, total water consumption is continuously increased, regeneration aggregate coagulation The cohesiveness and water-retaining property of soil reduce, and the carbonation depth and chloride diffusion coefficient of regeneration concrete gradually increase, durability Reduce, intensity reduces.Likewise, such as performance such as building block, water-permeable brick of other reconstituted products rich in brick is also poor.
How to improve its regeneration aggregate property rich in brick grain using the means of economic and reliable and then improve regeneration concrete Performance is current hotspot problem.For the aggregate that porous water imbibition is larger, it is considered that pre-wetted treatment can improve its performance, former Because being, the coarse aggregate not handled, because water absorption rate is larger, moisture is absorbed in concrete stirs preparation process, reduces flowing Property, the inabundant aquation of binder materials is caused, reduces intensity;Pre-wetted treatment is carried out, aggregate does not absorb aquation water, ensure that gelling The degree of hydration of material, but as the progress of concrete hydrating, cement slurry interior humidity gradually reduce, the moisture in aggregate is released Release and be restored in cement slurry, continue aquation and use, be advantageous to the growth of late strength of concrete.Carried based on this multidigit scholar Go out to consider the mixture ratio design of recycled aggregate concrete method of additional water, for the production of regeneration concrete, additional water consumption is typically adopted The water absorption under the dry state of gas, which is subtracted, with the water absorption under saturation state determines that saturation pre-wetted treatment is mass regeneration concrete An important step in plant produced.But the control for time of prewetting is very doubt, in general manufacturer production regeneration coagulation Water flushing was directly carried out during native produce to aggregate, aggregate is excessively dried, and does not reach perfect condition, if soaked for a long time, It is long to take production site, increases the mass production time, it is necessary to prewetting the time and control measure being studied to improve The performance of reconstituted product.
The content of the invention
To solve the above problems, the present invention provides a kind of control method for time of being prewetted rich in brick regenerated coarse aggregate.
The purpose of the present invention is realized in the following manner:A kind of controlling party for time of being prewetted rich in brick regenerated coarse aggregate Method, comprise the following steps:
(1)That collects same batch processed is rich in brick building rubbish, is bone of the brick content more than 90% rich in brick regenerated coarse aggregate Material, is crushed to it, is separated, sieve classification, the regenerated coarse aggregate being classified;
(2)The regenerated coarse aggregate of classification is rinsed with water, removes chip, dust and the impurity on regenerated coarse aggregate surface, dries 2 Reach more than it and do state with the gas of ambient humidity up to balance;
(3)According to GBT17431.2-1998《Lightweight aggregate detects detailed rules for the implementation》, obtain respectively its 5min, 10min, 15min, The regenerated coarse aggregate water absorption of 20min, 30min, 60min, 120min, 360min, 960min, 1440min and 2880min time And water absorption rate;
(4)It is fitted according to test data, obtains regenerated coarse aggregate water absorption and the relational expression of absorbent time, as water absorption Formula;
(5)Matched somebody with somebody according to production product category configuration stage, it is determined that the particle diameter and dosage of required coarse aggregate, according to(4)In obtained suction Water formula calculates the control time of prewetting under saturation degree needed for regenerated coarse aggregate;
(6)Regenerated coarse aggregate is prewetted according to the absorbent time of calculating, the regenerated coarse aggregate after prewetting crosses the absorbent cloth of vibration, together When through machinery dry, reach internal void water and reach saturation, the state of dry tack free.
The step(1)For, crushing rich in brick building rubbish by 0-5mm, 5-10mm, 10-20mm, 20-30mm and More than 30mm particle diameter carries out sieve classification.
The step(5)Middle saturation degree is the saturation degree of coarse aggregate pore water:Ps=WRCA(t)/WRCA(t=∞);Wherein WRCA (t=∞)For maximum water absorption, kg;WRCA(t) it is the water absorption of t times, g;Ps is the saturation degree of coarse aggregate pore water.Using thick Aggregate prepares concrete, and the saturation degree of coarse aggregate pore water is that the feature of cement mortar whether is fed for characterizing moisture in coarse aggregate Value, if aggregate saturation degree is more than cement mortar saturation degree, aggregate water replenishment cement mortar, concrete water-cement ratio increase, concrete Intensity decreases.
Regenerated coarse aggregate water absorption and the relational expression of absorbent time use logarithmic form, and the form meets independent variable t naturally> 0 condition, it is simpler relative to other forms structure;
The step(4)In, water absorption formula is, WRCAFor water absorption, mRCAFor regeneration Coarse aggregate quality, g, A, B are empirical value, are obtained by test data fitting, and t is absorbent time, min.
The step(5)Saturation degree needed for middle regenerated coarse aggregate is 90%-96%, rich in brick regenerated coarse aggregate in such a saturation Under degree, property is good, and the time of prewetting is grown again, and the saturation degree rich in brick regenerated coarse aggregate increases very little, and the time of prewetting is short again, rich in brick Regenerated coarse aggregate easily absorbs moisture in concrete preparation process, reduces mobility, causes the inabundant aquation of binder materials, drops Low-intensity.
Brick is firing shale brick, clay brick, colliery wastes brick and flyash brick etc..
It is aggregate of the brick content more than 90% rich in brick regenerated coarse aggregate.
The present invention can be according to the demand rich in brick regenerated coarse aggregate different saturation, to being carried out rich in brick regenerated coarse aggregate Prewet, avoid the time of prewetting rich in brick regenerated coarse aggregate oversize, take place of prewetting, lose time, reduce production efficiency;Too It is short not reach rich in the requirement of brick regenerated coarse aggregate saturation degree.
Brief description of the drawings
Fig. 1 is 5-10mm particle diameters regeneration aggregate water absorption rate curve in embodiment 1.
Fig. 2 is 10-20mm particle diameters regeneration aggregate water absorption rate curve in embodiment 1.
Fig. 3 is the water absorption rate curve of the firing shale brick of 5-10mm particle diameters removal wall in embodiment 2.
Fig. 4 is the water absorption rate curve of the firing shale brick of 10-20mm particle diameters removal wall in embodiment 2.
Fig. 5 is the water absorption rate curve of the clay brick of 5-10mm particle diameters removal wall in embodiment 3.
Fig. 6 is the water absorption rate curve of the clay brick of 10-20mm particle diameters removal wall in embodiment 3.
Fig. 7 is the water absorption rate curve of the clay brick of 20-30mm particle diameters removal wall in embodiment 3.
Embodiment
Explanation:For industrial production concrete, the relatively low product of intensity is generally used for, required coarse aggregate size is different , ratio needed for each particle diameter is also different, forms different gradings, and 5-20mm aggregate sizes are to industrialize regeneration concrete product such as The typical stage of recycled concrete block, regeneration concrete brick etc. is matched somebody with somebody.More than 20mm grain size is too big, and it is common to be not used in production Regeneration concrete product.It is aggregate of the brick content more than 90% rich in brick regenerated coarse aggregate in the application.
Embodiment 1
(1)Collection is rich in brick building rubbish, and in Zhengzhou City, perseverance capital construction material Co., Ltd is crushed and sieved to it;
(2)To aggregate gradation in laboratory, 0-5mm is formed, 5-10mm particle diameters, 10-20mm particle diameters, wherein 5-20mm particle diameters are made For coarse aggregate, below 5mm can be used as fine aggregate.And be rinsed with water, remove the chip on regeneration aggregate surface, dust and miscellaneous Matter, dry and reach within more than 2 days the dry state of gas;
(3)According to GBT17431.2-1998《Lightweight aggregate detects detailed rules for the implementation》, obtain respectively its 5min, 10min, 15min, The water absorption of the times such as 20min, 30min, 60min, 120min, 360min, 960min, 1440min and 2880min and water suction Rate;
Regeneration aggregate main component is common brick and concrete, and water imbibition is higher, through artificial screening process, has grading 0-5mm, 5- 10mm and 10-20mm, aggregate characteristics are shown in Table 1.
According to GBT17431.2-1998《Lightweight aggregate detects detailed rules for the implementation》, obtain water absorption rate by testing and change with time rule Rule is shown in Table shown in 2, table 3.
(4)It is fitted as depicted in figs. 1 and 2 according to test data, obtains respectively obtaining the water suction of particle diameter 5-10mm regeneration aggregates The relational expression of amount and the relational expression of absorbent time, particle diameter 10-20mm regeneration aggregates water absorption and absorbent time;
From Tables 1 and 2, the water absorption of different-grain diameter aggregate is increased over time and increased, the water suction speed of first 5 minutes Rate is maximum, tends towards stability afterwards, pore water basically reaches saturation;Aggregate water absorption is represented by with its being proportionate property of quality: =, W in formulaRCAFor water absorption, SRCAFor water absorption rate, mRCAFor quality, it is fitted according to test data, obtains aggregate water absorption public affairs Formula is as follows:
Particle diameter 5-10mm regeneration aggregate water absorptions:
Particle diameter 10-20mm regeneration aggregate water absorptions:
In formula, t is soak time, min, mRCAFor regeneration aggregate quality, g;
The coefficient correlation of formula predictions value and test value is respectively 0.968(Particle diameter 5 ~ 10mm aggregates)With 0.992(Particle diameter 10 ~ 20mm aggregates), illustrate that above-mentioned formula can be utilized for the prediction of high water absorption aggregate water absorption rate.
(5)To configure regeneration concrete, 5-10mm particle diameters and 10-20mm are pressed 2:3 are mixed to form required coarse aggregate, then mix Close aggregate t water absorption be:
The saturation degree of mixing coarse aggregate pore water is calculated with above-mentioned water absorption formula:
In formulam RCA(5-10): m RCA(10-20) =2:When 3, when the saturation degree of coarse aggregate pore waterPsFor 93% when, mix the pre- of aggregate The wet time is defined as 14min;It is selected to prewet two days and do not prewetted as two contrasts to prepare coagulation respectively with grading coarse aggregate Soil;
(6)Time of prewetting according to determination carries out coarse aggregate and prewetted, and the coarse aggregate after prewetting crosses the absorbent cloth of vibration, while through strong Power fan dry, reach dry face state, by prewet the time be 14min coarse aggregate by such as table 4 below match ratio, using traditional work Skill is prepared into regeneration concrete, and the compression strength for surveying its 3d, 7d and 28d is shown in Table 5.The coarse aggregate of other two times of prewetting also by According to such as following table match ratio, same process is prepared into concrete, and compression strength is shown in Table 5.
Note:Contain recycled fine aggregate in fine aggregate(Particle diameter 0-5mm)243.5kg, other is natural sand, and cement is Henan Province Feng Bo days The Feng Bo Tianruis P.C42-5 composite Portland cements of auspicious Cement Co., Ltd's production, water reducer are limited using the soft chemical industry in Shanghai The QS-8020 polycarboxylate water-reducers of company's production, dosage are the 3 ‰ of binder materials.
 
It can be seen from upper table, if not pre-wetted treatment, resisted using the dry crude aggregate of gas using the regeneration concrete of same process production Compressive Strength very little.Prewetting, the time is longer, and water content of aggregate is bigger, according to traditional mixing proportion design method, remaining mixing water Amount is fewer, and the pollinating family progeny in actual whipping process is smaller, and regeneration concrete mortar is more closely knit, therefore aggregate soaks life in 24 hours The recycled concrete strength of production is higher, but due to seldom with additional water flowing rate difference in immersion 14min aggregates, therefore 14min bones of prewetting Expect the recycled concrete strength value almost indifference of the regeneration concrete and 2d aggregates preparation of prewetting prepared.But the production time is then big It is big to reduce, be advantageous to improve production efficiency.
Embodiment 2
(1)Come from the firing shale brick of removal wall, it is crushed, sieved and is classified under laboratory environment;
(2)The brick aggregate of classification is rinsed with water, removes the chip, dust and impurity of aggregate surface, is dried more than 2 days and is reached Gas does state;
(3)Take particle diameter 5-10mm's, 10-20mm to be used as aggregate, measure its apparent density 926kg/m3, bulk density 515kg/ m3.According to GBT17431.2-1998《Lightweight aggregate detects detailed rules for the implementation》, respectively obtain the water absorption rates of different absorbent times;
(4)According to(3)Middle test data is fitted, and the relational expression for obtaining aggregate water absorption and absorbent time is as follows;
Particle diameter 5-10mm aggregate water absorption formula:
Particle diameter 10-20mm aggregate water absorption formula:
The water absorption rate curve of fitting is shown in Fig. 3, Fig. 4, and the coefficient correlation of formula predictions value and test value is divided into 0.9795 and 0.978, Also illustrate that above-mentioned formula can be utilized for the prediction of high water absorption aggregate water absorption rate.
(5)To produce multi-pore brick with recycled concrete, coarse aggregate presses 1 using particle diameter 5-10mm and 10-20mm discarded brick:1 Mixing aggregate is prepared into, the saturation degree of mixing coarse aggregate pore water is calculated with above-mentioned water absorption formula:
In formulam RCA(5-10): m RCA(10-20) =1:When 1, when the saturation degree of pore waterPsFor 90% when, mix prewetting the time for aggregate It is defined as 1 day;
(6)Time of prewetting according to determination carries out the coarse aggregate that mixed class is matched somebody with somebody and prewetted, and the coarse aggregate after prewetting crosses the water suction of vibration Cloth, while dried through high-power fan, reach dry face state.
Embodiment 3
(1)Come from the clay brick of removal wall, it is crushed under laboratory environment, sieved and is classified;
(2)The brick aggregate of classification is rinsed with water, removes the chip, dust and impurity of aggregate surface, is dried more than 2 days and is reached Gas does state;
(3)Broken brick body bulk density is 840 kg/m3-865kg/m3, take particle diameter 5-10mm, 10-20mm and 20-30mm again Raw aggregate, according to GBT17431.2-1998《Lightweight aggregate detects detailed rules for the implementation》, respectively obtain the water absorption rates of different absorbent times;
(4)It is fitted according to test data, the relational expression for obtaining aggregate water absorption and absorbent time is as follows;
Particle diameter 5-10mm aggregate water absorption formula:
Particle diameter 10-20mm aggregate water absorption formula:
Particle diameter 20-30mm aggregate water absorption formula:
In formula, t is soak time, mRCAFor aggregate quality;The water absorption rate curve of fitting is shown in Fig. 5-Fig. 7, formula predictions value and experiment The coefficient correlation of value is all higher than 0.96, also illustrates that above-mentioned formula can be utilized for the prediction of high water absorption aggregate water absorption rate.
(5)To produce regenerative pervious concrete, particle diameter 20-30mm, 10-20mm and 5-10mm are according to 4:4:1 ratio is matched somebody with somebody The mixing aggregate of needs is put, according to above-mentioned(4)Water absorption formula calculates the saturation degree of aggregate pore water:
The time 13min that the prewets when saturation degree of pore water is 90%;
(6)Time of prewetting according to determination carries out the coarse aggregate that mixed class is matched somebody with somebody and prewetted, and the coarse aggregate after prewetting crosses the water suction of vibration Cloth, while dried through high-power fan, reach dry face state.
The advantage of the invention is that:Control method is simple and can be used for job site, and above-mentioned control method is equally applicable to The light-weight aggregates such as haydites of book structure, clay haydite, the concrete prepared have higher performance.
Above-described is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, Under the premise of general idea of the present invention is not departed from, some changes and improvements can also be made, these should also be considered as the present invention's Protection domain.

Claims (7)

  1. A kind of 1. control method for time of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:Comprise the following steps:
    (1)That collects same batch processed is rich in brick building rubbish, is bone of the brick content more than 90% rich in brick regenerated coarse aggregate Material, is crushed to it, sieved and is classified, and is met the regenerated coarse aggregate of grading requirement;
    (2)The regenerated coarse aggregate of classification is rinsed with water, removes chip, dust and the impurity on regenerated coarse aggregate surface, dries 2 Reach more than it and do state with the gas of ambient humidity up to balance;
    (3)According to GBT17431.2-1998《Lightweight aggregate detects detailed rules for the implementation》, obtain respectively its 5min, 10min, 15min, 20min, 30min, 60min, 120min, 360min, 960min, 1440min and 2880min regenerated coarse aggregate water absorption and suction Water rate;
    (4)It is fitted according to test data, obtains regenerated coarse aggregate water absorption and the relational expression of absorbent time, as water absorption Formula;
    (5)Matched somebody with somebody according to production product category configuration stage, it is determined that the particle diameter and dosage of required coarse aggregate, according to step(4)In obtain Water absorption formula calculate prewetting the time under saturation degree, i.e. absorbent time needed for regenerated coarse aggregate;
    (6)Regenerated coarse aggregate is prewetted according to the time of prewetting of calculating, the regenerated coarse aggregate after prewetting crosses the absorbent cloth of vibration, together When through machinery dry, reach saturated dry surface.
  2. 2. the control method of time according to claim 1 of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:The step Suddenly(1)For crushing is entered rich in brick building rubbish by 0-5mm, 5-10mm, 10-20mm, 20-30mm and more than 30mm particle diameter Row sieve classification.
  3. 3. the control method of time according to claim 1 of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:It is described Step(5)Middle saturation degree is the saturation degree of coarse aggregate pore water:Ps= WRCA(t)/WRCA(t=∞), wherein WRCA(t=∞)Inhaled for maximum Water, WRCA(t)For the water absorption of t times, Ps is the saturation degree of coarse aggregate pore water.
  4. 4. the control method of time according to claim 3 of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:Regeneration is thick Aggregate water absorption and the relational expression of absorbent time use logarithmic form.
  5. 5. the control method of time according to claim 4 of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:The step Suddenly(4)In, water absorption formula is;WRCA(t) it is the water absorption of t;mRCAFor regenerated coarse aggregate quality;A, B is empirical value, is led to Overtesting data are fitted to obtain;T is absorbent time.
  6. 6. the control method of time according to claim 1 of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:The step Suddenly(5)Saturation degree needed for middle regenerated coarse aggregate is 90%-96%.
  7. 7. the control method of time according to claim 1 of being prewetted rich in brick regenerated coarse aggregate, it is characterised in that:Brick is burning Shale brick, clay brick, colliery wastes brick and flyash brick processed.
CN201711156318.9A 2017-11-20 2017-11-20 Pre-wetting time control method for brick-rich recycled coarse aggregate Active CN107721226B (en)

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CN108489848A (en) * 2018-05-30 2018-09-04 陕西省交通建设集团公司 The rapid detection method of brick content in a kind of regenerated coarse aggregate
CN109665733A (en) * 2019-02-25 2019-04-23 郑州经纬西部新型建材科技有限公司 A kind of construction refuse regenerated aggregate concrete formulating method

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CN108489848A (en) * 2018-05-30 2018-09-04 陕西省交通建设集团公司 The rapid detection method of brick content in a kind of regenerated coarse aggregate
CN109665733A (en) * 2019-02-25 2019-04-23 郑州经纬西部新型建材科技有限公司 A kind of construction refuse regenerated aggregate concrete formulating method

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