CN107478537A - Porous coarse aggregate is in water absorption rate test method during concrete mixes and stirs and determines to mix and stir the method for additional water consumption in concrete - Google Patents

Porous coarse aggregate is in water absorption rate test method during concrete mixes and stirs and determines to mix and stir the method for additional water consumption in concrete Download PDF

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Publication number
CN107478537A
CN107478537A CN201710631290.3A CN201710631290A CN107478537A CN 107478537 A CN107478537 A CN 107478537A CN 201710631290 A CN201710631290 A CN 201710631290A CN 107478537 A CN107478537 A CN 107478537A
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China
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coarse aggregate
mortar
concrete
absorption rate
water absorption
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CN201710631290.3A
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CN107478537B (en
Inventor
杨海成
邓春林
岑文杰
熊建波
范志宏
王胜年
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CCCC Fourth Harbor Engineering Co Ltd
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CCCC Fourth Harbor Engineering Institute Co Ltd
Guangzhou Harbor Engineering Quality Inspection Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
    • G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
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  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

It is other to comprise the following steps the invention discloses a kind of method of porous coarse aggregate water absorption rate test during concrete mixes and stirs：Porous coarse aggregate, binder materials and fine aggregate are mixed and stirred；The lower mortar of sieve is taken, weighs, pours into absolute ethyl alcohol and stirring；The upper porous coarse aggregate of sieve is taken, is weighed, it is clean with washes of absolute alcohol, rinse the mortar to get off and pour into absolute ethyl alcohol and stirring；The moisture for ensuring to sieve in lower mortar and the mortar rinsed cements out completely；The mortar that mortar, the coarse aggregate cleaned and flushing are got off under sieving is dried and calculates porous coarse aggregate water absorption rate when adding the water mixing time to be t.The present invention can test exactly mix and stir during in concrete porous coarse aggregate different time water absorption rate, to be mixed and stirred according to concrete and the duration of pouring, the rationally additional water consumption of porous coarse aggregate is determined, is favorably improved the mechanical property and endurance quality of porous coarse aggregate concrete.

Description

Porous coarse aggregate water absorption rate test method and determination during concrete mixes and stirs are mixed and stirred The method that water consumption is added in concrete
Technical field
The invention belongs to civil engineering detection technique field, patent is related to a kind of aggregate water absorption rate test method, especially A kind of porous coarse aggregate water absorption rate test method during concrete mixes and stirs.
Background technology
The porous aggregates such as haydites of book structure, lytag, corallite, its material internal voidage is high, is mixing and stirring concrete When, influence of the porous aggregate water imbibition to mixing water amount need to be considered, the water absorption that generally use aggregate soaks 1h in water is made Water consumption is added for concrete.
The water absorption course that coarse aggregate is immersed in water is different from the water absorption course in mortar is mixed and stirred：Coarse aggregate was mixing and stirring Mixing water will be shared with binder materials such as cement, flyash in journey, porous coarse aggregate is because surface is by mortar etc. during being somebody's turn to do The reasons such as blocking, transmission of the moisture in aggregate will be hindered；It is directly placed into water and soaks compared to porous coarse aggregate in addition, is mixing and stirring During concrete, concrete mixing water amount is few, and because binder materials, the specific surface area of sand are big, its rate of water absorption will be substantially than more The rate of water absorption of hole coarse aggregate is fast.
Therefore, when adding water consumption as concrete using the water absorption of 1h in soaking water, porous coarse aggregate will be exaggerated Actual water absorption so that concrete actual used water amount and the ratio of mud increase, so as to cause mechanical performance of concrete, endurance quality Reduction.
The content of the invention
Present invention seek to address that above mentioned problem, there is provided one kind can truly test porous coarse aggregate water suction in fresh concrete The method of testing of rate, to determine the rationally additional water consumption of coarse aggregate, it is favorably improved the mechanics of porous coarse aggregate concrete Performance and endurance quality.
To achieve these goals, present invention employs following technical scheme：A kind of porous coarse aggregate mixes and stirs in concrete During water absorption rate test method, it is characterised in that it comprises the following steps：
Step 1：Concrete stirring examination will be poured into for mixing and stirring porous coarse aggregate, binder materials and the fine aggregate of concrete After the machine of testing mixes and stirs 12~16 seconds, water is added to be sieved after mixing and stirring, wherein the time for adding water to mix and stir is t；
Step 2：The lower mortar of sieve is taken, claims its quality, with ms1Represent, pour into the anhydrous second that weight is 2~3 times of mortar weight Alcohol, stirring；
Step 3：The upper porous coarse aggregate of sieve is taken, claims its quality, with ms2Represent；Using absolute ethyl alcohol as cleaning agent using super Sound wave cleaning machine cleans up to the mortar for sieving upper coarse aggregate surface, and the coarse aggregate storage cleaned on one side, rinses the sand to get off Slurry is put into container and pours into absolute ethyl alcohol and stirring, and absolute ethyl alcohol liquid level highly should be higher than that 4~6cm of mortar surface；
Step 4：It it is 3~4 hours in the whipping process for adding absolute ethyl alcohol of step 2 and step 3, whipping process needs not It is disconnected to add absolute ethyl alcohol to supplement the ethanol of volatilization, it is ensured that the moisture in the lower mortar of sieve and the mortar rinsed displaces completely Come；
Step 5：The mortar that mortar, the coarse aggregate cleaned and flushing are got off under sieving is dried；
Step 6：Mortar quality, the coarse aggregate quality cleaned and the mortar quality rinsed under dried sieve Respectively with mg1、mg2、mg3Represent；
Step 7：Porous coarse aggregate water absorption rate when adding the water mixing time to be t is calculated as follows：
Porous coarse aggregate water absorption rate/%：
Wherein：
Step 1 is sieved using 4.75mm square hole screens.
Step 5 is dried using drying box, and drying temperature is arranged to 75~85 DEG C, 22~25h of drying time.
Before step 1, first porous coarse aggregate and fine aggregate are air-dried.
A kind of to determine to mix and stir the method that water consumption is added in concrete, it comprises the following steps：
(1) carried out according to the method for as above any described porous coarse aggregate water absorption rate test in fresh concrete multigroup Test experiments, one the step of test experiments in plus the water mixing time be respectively t1,t2……tn, measure corresponding porous thick bone Expect that water absorption rate is respectively Xt1,Xt2……Xtn；
(2) construction concrete is prepared using identical dispensing, according to concrete it is required from mixing and stirring pour into a mould when Between find porous coarse aggregate water absorption rate in the case of the same plus water mixing time；
(3) the additional water consumption according to needed for the dosage of porous coarse aggregate and water absorption rate determine construction concrete.
The present invention is taken out porous coarse aggregate and mortar, soaked using ethanol by the fresh concrete to the different mixing times Porous coarse aggregate and mortar are steeped, to prevent the aquation of binder materials, and the water in mortar is displaced.The present invention can survey exactly Trial mix and during in concrete porous coarse aggregate different time water absorption rate, to be mixed and stirred according to concrete and the duration of pouring, The rationally additional water consumption of porous coarse aggregate is determined, is favorably improved the mechanical property and durability of porous coarse aggregate concrete Energy.
Embodiment
Porous coarse aggregate in this specification includes but not limited to the porous bone such as haydites of book structure, lytag, corallite Material.
The specific implementation step of the present invention is as follows：
Before development concrete mixes and stirs experiment, porous coarse aggregate, fine aggregate should be air-dried.According to concrete mix, weigh The mixs such as porous coarse aggregate, binder materials, fine aggregate, water, additive, to ensure the homogenieity of mix, mix should not Rare 25L, this experiment take 30L.
The porous coarse aggregate, binder materials and the fine aggregate that mix and stir concrete are poured into concrete stirring testing machine successively, mixed After 15s, it is 2.5min to add water to mix and stir t, and after mixing and stirring end, fresh concrete is crossed into 4.75mm square hole screens immediately.
The lower mortar of sieve is taken, claims its quality, with ms1Represent, pour into the absolute ethyl alcohol that quality is 2~3 times of mortar, be put into 2L's In wide-mouth volumetric flask, it is stirred immediately using electric mixer, mix should be avoided to spill in whipping process.
The upper porous coarse aggregate of sieve is taken, claims its quality, with ms2Represent；Upper porous coarse aggregate table will be sieved using supersonic wave cleaning machine The mortar in face cleans up, and cleaning agent is absolute ethyl alcohol, and the coarse aggregate storage cleaned is on one side.The mortar rinsed is put into Container, and after pouring into absolute ethyl alcohol, be stirred immediately using electric mixer, mix should be avoided to spill in whipping process.
During experiment, with the volatilization of ethanol, absolute ethyl alcohol need to be constantly added, adds the absolute ethyl alcohol and stirring time to be no less than 3 hours, cemented out completely with the moisture ensured in mortar.
The mortar that mortar, the coarse aggregate cleaned and flushing are got off under sieving, is put into drying box, drying temperature is arranged to 80 DEG C, drying time 24h；
Mortar quality under dried sieve, the coarse aggregate quality cleaned and the mortar quality rinsed are weighed, point Not with mg1、mg2、mg3Represent；
Porous coarse aggregate water absorption rate/% is tested using below equation：
Wherein：
Test obtains water absorption rate of the porous coarse aggregate when adding water mixing time t to be 2.5min；
Above step is repeated, is tested respectively porous when adding the water mixing time to be respectively 5min, 10min, 30min and 1h Coarse aggregate water absorption rate.As a result see the table below shown in 1.
Table 1
And in contrast experiment, the water absorption rate that porous coarse aggregate is immersed in 1h in water is 8.93%, is being mixed higher than this experiment With the water absorption rate of 1h in thing.
If it is 30min initially to be mixed and stirred from concrete to time of cast-in-site is transported to, it is desirable corresponding to the mixing time be Water absorption rate of the porous coarse aggregate water absorption rate 6.69% as the porous coarse aggregate for implementing concrete at 30 minutes, if every cube The dosage of porous coarse aggregate is 700kg in porous aggregate concrete, then the additional water consumption in every cube of concrete is 700kg*6.69%=46.83kg.

Claims (5)

  1. A kind of 1. method of porous coarse aggregate water absorption rate test during concrete mixes and stirs, it is characterised in that it includes following Step：
    Step 1：Concrete stirring testing machine will be poured into for the porous coarse aggregate, binder materials and the fine aggregate that mix and stir concrete After mixing and stirring 12~16 seconds, water is added to be sieved after mixing and stirring, wherein the time for adding water to mix and stir is t；
    Step 2：The lower mortar of sieve is taken, claims its quality, with ms1Represent, pour into the absolute ethyl alcohol that weight is 2~3 times of mortar weight, stir Mix；
    Step 3：The upper porous coarse aggregate of sieve is taken, claims its quality, with ms2Represent；Ultrasonic wave is used using absolute ethyl alcohol as cleaning agent Cleaning machine cleans up to the mortar for sieving upper coarse aggregate surface, and the coarse aggregate storage cleaned on one side, is rinsed the mortar to get off and put Enter container and pour into absolute ethyl alcohol and stirring, absolute ethyl alcohol liquid level highly should be higher than that 4~6cm of mortar surface；
    Step 4：It it is 3~4 hours in the whipping process for adding absolute ethyl alcohol of step 2 and step 3, whipping process need to constantly add Add absolute ethyl alcohol to supplement the ethanol of volatilization, it is ensured that the moisture in the lower mortar of sieve and the mortar rinsed cements out completely；
    Step 5：The mortar that mortar, the coarse aggregate cleaned and flushing are got off under sieving is dried；
    Step 6：Mortar quality, the coarse aggregate quality cleaned and the mortar quality difference rinsed under dried sieve With mg1、mg2、mg3Represent；
    Step 7：Porous coarse aggregate water absorption rate when adding the water mixing time to be t is calculated as follows：
    Porous coarse aggregate water absorption rate/%：
    Wherein：
  2. 2. the method for porous coarse aggregate water absorption rate test in fresh concrete according to claim 1, it is characterised in that： Step 1 is sieved using 4.75mm square hole screens.
  3. 3. the method for porous coarse aggregate water absorption rate test in fresh concrete according to claim 1, it is characterised in that： Step 5 is dried using drying box, and drying temperature is arranged to 75~85 DEG C, 22~25h of drying time.
  4. 4. the method for porous coarse aggregate water absorption rate test in fresh concrete according to claim 1, it is characterised in that： Before step 1, first porous coarse aggregate and fine aggregate are air-dried.
  5. 5. a kind of determine to mix and stir the method that water consumption is added in concrete, it is characterised in that comprises the following steps：
    (1) carried out according to the method for any described porous coarse aggregate water absorption rate test in fresh concrete of Claims 1 to 4 Multigroup test experiments, one the step of test experiments in plus the water mixing time be respectively t1,t2……tn, measure corresponding porous Coarse aggregate water absorption rate is respectively Xt1,Xt2……Xtn；
    (2) construction concrete is prepared using identical dispensing, the time according to needed for concrete from mixing and stirring to pouring into a mould looks for To porous coarse aggregate water absorption rate same plus in the case of the water mixing time；
    (3) the additional water consumption according to needed for the dosage of porous coarse aggregate and water absorption rate determine construction concrete.
CN201710631290.3A 2017-07-28 2017-07-28 Method for testing water absorption rate of coarse aggregate in mixing process and determining additional water consumption Active CN107478537B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114577657A (en) * 2020-12-02 2022-06-03 博特新材料泰州有限公司 Method for measuring water absorption of recycled aggregate in cement base material

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FR2925688A1 (en) * 2007-12-21 2009-06-26 Bouygues Construction Sa Aggregate sample's water content measuring method for concrete mixing plant, involves heating aggregate sample contained in sealed container, measuring increase of sample temperature, and deducing water content of sample from measurement
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CN102346121A (en) * 2010-07-29 2012-02-08 中冶天工上海十三冶建设有限公司 Quick detection method for fine aggregate water content
KR101170025B1 (en) * 2012-04-09 2012-07-31 (주)무한콘트롤 Apparatus for measuring water content and measuring method using the same
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Publication number Priority date Publication date Assignee Title
FR2925688A1 (en) * 2007-12-21 2009-06-26 Bouygues Construction Sa Aggregate sample's water content measuring method for concrete mixing plant, involves heating aggregate sample contained in sealed container, measuring increase of sample temperature, and deducing water content of sample from measurement
CN101629889A (en) * 2009-08-18 2010-01-20 中国建筑第八工程局有限公司 Method for measuring pressure water absorption rate of lightweight aggregate concrete
CN102346121A (en) * 2010-07-29 2012-02-08 中冶天工上海十三冶建设有限公司 Quick detection method for fine aggregate water content
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114577657A (en) * 2020-12-02 2022-06-03 博特新材料泰州有限公司 Method for measuring water absorption of recycled aggregate in cement base material
CN114577657B (en) * 2020-12-02 2024-06-04 博特新材料泰州有限公司 Method for measuring water absorption rate of recycled aggregate in cement base material

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Effective date of registration: 20201202

Address after: 510000 headquarters building, Guangzhou, Haizhuqu District, Guangdong Zhenxing street, No. 18,

Patentee after: CCCC FOURTH FARBOR ENGINEERING Co.,Ltd.

Address before: 510230 No. 157 Qianjin Road, Guangdong, Guangzhou

Patentee before: CCCC FOURTH HARBOR ENGINEERING INSTITUTE Co.,Ltd.

Patentee before: GUANGZHOU HARBOR ENGINEERING QUALITY EXAMINATION Co.,Ltd.