CN103234867A - Lightweight aggregate concrete pumpability testing method - Google Patents
Lightweight aggregate concrete pumpability testing method Download PDFInfo
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- CN103234867A CN103234867A CN2013101220790A CN201310122079A CN103234867A CN 103234867 A CN103234867 A CN 103234867A CN 2013101220790 A CN2013101220790 A CN 2013101220790A CN 201310122079 A CN201310122079 A CN 201310122079A CN 103234867 A CN103234867 A CN 103234867A
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Abstract
The invention provides a lightweight aggregate concrete pumpability testing method. According to the invention, a direct-reading air content tester commonly used in a mixing station is adopted; a lightweight aggregate concrete mixture in the tester is continuously pressurized by using a pneumatic method, until the pressure is constant; when the pressure is stable, the pressurization is stopped for 30s, and the pressure is released; the concrete is discharges and sufficiently mixed; air content of the pressurized lightweight aggregate concrete is tested; and lightweight aggregate concrete performances such as slump and workability are tested, such that whether the concrete satisfies pumping requirements is determined. With the method provided by the invention, lightweight aggregate concrete pumpability testing method technical gap is filled. The method has the advantages such as simple operation, reliable result, high applicability, and the like. The method is especially suitable for rapidly and accurately determining lightweight aggregate concrete pumpability.
Description
Technical field
The present invention relates to building material technical field, specifically a kind of method of testing of lightweight aggregate concrete pumpability.
Background technology
Lightweight aggregate concrete is owing to have advantages such as lightweight, sound insulation, protection against the tide, insulation, antidetonation and fire performance are good, and the advantage of using in engineering more and more comes into one's own.Along with the renewal of architectural design theory, lightweight aggregate concrete commercialization process certainly will be accelerated, and occupies certain share in concrete market, becomes the new product of ready-mixed concrete enterprise.
Because the lightweight aggregate in the lightweight aggregate concrete easily floats, cause the lightweight aggregate concrete segregation, and lightweight aggregate easily absorbs water, especially under the pumping pressure effect, lightweight aggregate is suction further, this makes lightweight aggregate concrete be difficult to pumping, simultaneously the serviceability of lightweight aggregate concrete, mechanical property, endurance quality etc. is produced totally unfavorable influence.
The good concrete mix of pumpability should have good flowability, stability and less friction resistance.The concrete mix flowability can be by the reflection of concrete slump consistancy test, and concrete friction resistance diminishes with the increase of its slump.Therefore the pumpability of normal concrete can be able to be judged by the concrete slump and pressure bleeding rate index.
Normal concrete is judged its pumpability energy by the test of pressure bleeding rate, and lightweight aggregate concrete is because its water absorption under pressure performance causes pressure bleeding rate result can't correctly judge the pumpability energy.Existing lightweight aggregate concrete pumping test is to adopt mixing plant to mix lightweight aggregate concrete processed, does the pumping test with pump truck, but to check its whether pumping.But through the engineering practice examining, stifled pump problem often takes place still in work progress.Analyze former because: when producing lightweight aggregate concrete in enormous quantities, because that lightweight aggregate is difficult to accomplish water percentage is consistent or reach capacity all the time.Water absorptivity method of testing in lightweight aggregate concrete and the test method thereof can not reflect the water absorption character of lightweight aggregate concrete in the practice of construction.Because in the practice of construction, lightweight aggregate is in saturation state, this during with standard testing the water absorption character under the over dry original state different, and lightweight aggregate under pump function further suction cause concrete mix state deteriorating, influence concrete pumpability.Can not frequently determine the pumpability of concrete mix in the construction by pump testing.Still the test method that does not have at present suitable evaluation lightweight aggregate concrete pumpability.
The problems referred to above have had a strong impact on the widespread use of lightweight aggregate concrete, therefore, seek a kind of simple, quick, reliable lightweight aggregate concrete pumpability test method, have crucial effects to further applying lightweight aggregate concrete.
Summary of the invention
Technical scheme of the present invention be realize in the following manner for filling up existing lightweight aggregate concrete inspection technology blank, provide a kind of can fast, effectively judge the lightweight aggregate concrete pumpability can method of testing.
Method of the present invention realizes in the following manner, adopt pneumatic process that the lightweight aggregate concrete mixture in the analyzer is carried out persistent pressure, no longer change until pressure, quietly after the pressure stability stop the 30s release, concrete emitted and fully mix is even, use direct-reading air content analyzer, test air content of each in the lightweight aggregate concrete after pressurizeing, test the lightweight aggregate concrete slump again, whether satisfy the pumping construction requirement to judge lightweight aggregate concrete; Concrete steps are as follows:
(1) clean air content analyzer amount alms bowl and alms bowl interior surface with wet cloth, and the amount of making alms bowl is horizontal positioned;
(2) with in the uniform charge weight alms bowl of fresh concrete mix, make slightly surmount alms bowl mouth of concrete mix, carry out jolt ramming then, jolt ramming comprises following dual mode:
During 1) with shaking table jolt ramming, control shaking table vibration frequency 50HZ, amplitude 0.5 ± 0.1mm when unloaded, in the vibration processes as the concrete mix amount of the being lower than alms bowl mouth that sinks, then should add the concrete mix at any time, it is smooth to be vibrated to concrete surface, present the glaze light time namely stop the vibration;
During 2) with the tamper tamping, dividing the concrete mix three times packs into, after each tamping 1/3rd of the concrete mix amount of accounting for alms bowl volume, during tamping for the first time, tamper should run through whole concrete mix, last inserting when smashing, and tamper should insert the material degree of depth 10-20mm that packs into for the first time, after every layer of tamping, the tamper pad about amount alms bowl lower curtate alternately the top hit ground 15 times;
(3) after jolt ramming or tamping finish, should there be depression to fill up as oral area immediately with the unnecessary concrete mix of the floating rule amount of scraping off alms bowl oral area, uses trowel floating then;
(4) amount of cleaning alms bowl and alms bowl lid edge is put in O shape rubber seal in the groove at alms bowl lid edge, covers on amount alms bowl mouth, uses clamp, makes it to keep impermeability, and checks level with level meter;
(5) with inflating pressurization in the inflator pump vector alms bowl, control inflator pump gauge pressure reaches 6MPa, closes the valve that connects inflator pump, around the wooden Chui amount of rapping alms bowl, make pressure be uniformly distributed in sample everywhere, open the inflator pump valve again and make the inflation gauge pressure keep 6MPa, repetitive operation, till the rain glass pointer is no longer mobile, after stablizing 30s, open vent valve, the amount of making alms bowl is decompressed to normal pressure, unclamp clip, take off the alms bowl lid;
(6) the concrete mix sample in the amount of the pouring out alms bowl, and fully mix is even, carries out the concrete slump test again, by the concrete slump after the pressurization is tested to judge whether concrete has the pumpability energy.
Beneficial effect of the present invention is as follows:
Use mixing plant direct-reading air content analyzer commonly used, adopt pneumatic process that the lightweight aggregate concrete mixture in the analyzer is carried out persistent pressure, no longer change until pressure, quietly after the pressure stability stop the 30s release, concrete emitted and fully mix is even, after the air content of test lightweight aggregate concrete after pressurizeing, test performances such as the lightweight aggregate concrete slump, workability again, whether satisfy the pumping construction requirement to judge it.
Embodiment
Lightweight aggregate concrete pumpability method of testing principle is as follows:
Direct-reading concrete 's air-containing analyzer measuring principle is according to equation of gaseous state, keep the air chamber of certain pressure and fill between the amount alms bowl of test portion, when opening and closing pressure equilibrium, when the pressure of two containers reaches balance, the amount that air chamber pressure reduces namely is the shared number percent of air content in the mortar, and what express at tensimeter namely is air content in the test portion.When atmospheric pressure reached balance in two containers, pressure was consistent with the pressure in the fully charged amount alms bowl in the air chamber.Lightweight aggregate in the amount alms bowl inner concrete can produce suction under the effect of air pressure, cause volume of concrete generation microvariations, thus decrease alms bowl internal gas pressure.Continue to suppress in the amount alms bowl, the lightweight aggregate suction in amount alms bowl inner concrete is saturated, and volume of concrete no longer changes, and namely pointer is no longer mobile on the direct-reading air content analyzer instrument.
The water-intake rate of the lightweight aggregate state that will reach capacity under the normal condition, its time is long and wayward, (haydite absorbed water saturated later in general 3 days and the air content analyzer is suppressed the saturated water absorption basically identical of absorptivity and lightweight aggregate after the lightweight aggregate pressurization that method surveys, see Table 1), so the suction after the lightweight aggregate concrete pressurization also is saturated suction.And the lightweight aggregate concrete after the saturated suction, big variation all no longer takes place to bear its state of much pump pressures again, and whether the concrete state (slump, workability etc.) that can concrete mix pumping depend primarily under the pump function satisfies the pumping requirement.We have passed through a large amount of engineering verifications for this.As long as the air content analyzer is suppressed the concrete of method success of the test; basically pumping is all no problem, is not very big with pumping apart from the distance relation, because haydite concrete is low weight; haydite concrete after the saturated suction, even than all pumpings easily of normal concrete.
Table 1 lightweight aggregate normal pressure water-intake rate and pressure water absorption rate are relatively
| Soak time | 1h | 24h | 2d | 3d | 5d | 7d |
| Normal pressure water-intake rate/% | 11.7 | 14.8 | 16.3 | 19.0 | 19.4 | 19.0 |
| Pressure water absorption rate/% | 19.1 | 18.9 | 19.0 | 19.1 | 19.2 | 18.9 |
Concrete steps are as follows:
1, clean air content analyzer amount alms bowl and alms bowl interior surface with wet cloth, and the amount of making alms bowl is horizontal positioned;
2, with in the uniform charge weight alms bowl of fresh concrete mix, make concrete mix surmount alms bowl a little.When filling with substance can be inserted a little with tamper and smash, after installing, when using shaking table (shaking table frequency 50HZ, when unloaded during amplitude 0.5 ± 0.1mm) jolt ramming, sink to being lower than internal orifice as the concrete mix in the vibration processes, then should add the concrete mix at any time, it is smooth to be vibrated to concrete surface, present the glaze light time namely stop the vibration.When using the tamper tamping instead without shaking table, divide three layers to pack into the concrete mix, after every layer of tamping 1/3rd of the amount of being about alms bowl height, insert that tamper should run through entire depth when smashing bottom.Insert when smashing the upper strata, tamper should insert the 10-20mm of lower floor.After every layer of tamping, can be the tamper pad at amount alms bowl lower curtate, will measure alternately runs about alms bowl hits ground 15 times;
3, after tamping finishes, should scrape off the unnecessary concrete mix in surface with floating rule immediately, the surface should be filled up if any depression, uses trowel floating then;
4, the amount of cleaning alms bowl and alms bowl lid edge is put in O shape rubber seal (238 * 8.6) in the groove at alms bowl lid edge, covers the alms bowl lid, uses clamp, makes it airtight good, and checks level with level meter;
5, shut all valves, inflate pressurization with inflator, make gauge pressure reach maximum, press valve lever, around the wooden Chui amount of rapping alms bowl, make pressure be uniformly distributed in sample everywhere, inflate again and make gauge pressure reach maximum, press valve lever, repetitive operation, no longer mobile until pressing the valve lever backpointer, after stablizing 30s, open air outlet valve, from the amount alms bowl, exit, send out clip, take off the alms bowl lid;
6, the concrete mix sample in the amount of the pouring out alms bowl, and fully mix is even, carries out the concrete slump test, judges the concrete pumpability energy by test.
The present invention makes it have following beneficial effect owing to adopted above technical scheme:
The lightweight aggregate concrete that stirs, treats pumping is filled the air content analyzer, inserting to smash or vibrate makes it closely knit, install pressue device, pressurization is inflated to scheduled pressure value, after keeping certain hour, pour out lightweight aggregate concrete, carry out testing performance index after stirring, whether satisfy the pumping construction condition to judge it.The technological gap of lightweight aggregate concrete pumpability method of testing has been filled up in present technique invention, has advantages such as simple to operate, reliable results, applicability are strong, is specially adapted to fast, accurately judge the pumpability of lightweight aggregate concrete.
Embodiment 1
Certain International airport terminal:
Structural thermal insulation lightweight aggregate concrete, the total consumption 2800m of concrete are adopted in two layers of ground of this project design
3Require concrete dry density to be not more than 1700kg/m
3, adopting pumping construction technology, maximum horizontal pumping distance is greater than 150m.In 1 hour trucd mixer shipping time, the longest wait discharging time reaches 3.5 hours in the work progress.
(1) lightweight aggregate concrete starting material
Cement: PO32.5R cement, actual compressive strength surpassed 40.2Mpa in 28 days;
Lightweight aggregate: adopt 5～15mm haydites of book structure.Haydite absorbs water more than 24 hours in advance before producing, and guarantees that the pre-water-intake rate of haydite is greater than 15%;
Yellow ground: river sand medium sand, modulus of fineness 3.0;
Flyash:
Level flyash;
Additive: polycarboxylic acid series additive, this additive have stable efficient water-reducing property and excellent slump hold facility;
(2) construction lightweight aggregate concrete proportioning
Construction with lightweight aggregate pump concrete proportioning is: m(water): m(cement): m(flyash): the m(haydite): m(sand): the m(water reducer)=and 170:300:250:450:550:5.5
Going out the machine slump is 200～220mm, and the slump is 180～200mm after 1 hour, and the slump is 160～180mm after the pressure test.
Suppress method with the pressue device simulation in the production run lightweight aggregate concrete mix is carried out production run control and factory inspection.The result of use of lightweight aggregate concrete and test findings basically identical.The lightweight aggregate concrete that experimental examination is qualified satisfies the requirement of pumping construction fully, has further verified the accuracy of test.Pump pressure 5.0～6.0MPa before the piston, concrete slump 180～200mm before the pumping, concrete slump 160～180mm after the pumping, concrete dry density 1660kg/m
3, 28 days average compressive strength of concrete reaches 28.5MPa before the pump, 28 days average compressive strength 26.7MPa of concrete behind the pump, and concrete surface does not have obvious crack.
Embodiment 2
Certain post and telecommunications mansion laboratory building engineering:
This project is positioned at postal mansion underground garage top, three story frame structures.For alleviating deadweight, body pillar, plate, post are all used LC30 light in structure aggregate pump concrete.The total consumption 1600m of lightweight aggregate concrete
3, require concrete dry density to be not more than 1900kg/m
3
(1) lightweight aggregate concrete starting material
Cement: PO42.5R cement, actual compressive strength surpassed 46.8MPa in 28 days.
Lightweight aggregate: adopt 5～15mm haydites of book structure.Haydite absorbs water more than 24 hours in advance before producing, and guarantees that the pre-water-intake rate of haydite is greater than 15%;
Yellow ground: river sand medium sand, modulus of fineness 2.8;
Flyash:
Level flyash;
Additive: polycarboxylic acid series additive, this additive have stable efficient water-reducing property and excellent slump hold facility;
(2) construction lightweight aggregate concrete proportioning
Construction with lightweight aggregate pump concrete proportioning is: m(water): m(cement): m(flyash): the m(haydite): m(sand): the m(water reducer)=and 175:350:200:500:620:6.0
Going out the machine slump is 180～200mm, and the slump is 160～180mm after 1 hour, and the slump is 160～180mm after the pressure test.
The lightweight aggregate concrete pumping is very well in the work progress.Presentation quality is good after the form removal of concrete vertical structure, does not have obvious bubble and honeycomb and scale.In the quality check process at subsequently quality supervision station, the test of concrete solid core boring sampling is all qualified, and compressive strength mean value reaches 34.5MPa.
Use through long-term engineering, prove that this lightweight aggregate concrete test method is easy to be reliable, can whether be applicable to that pumping construction accurately judges to lightweight aggregate concrete.
The embodiment of the invention does not constitute the restriction to the present technique invention.
Except the disclosed technical characterictic of instructions of the present invention, be the public office technology of those skilled in the art.
Claims (1)
1. the method for testing of a lightweight aggregate concrete pumpability, it is characterized in that, adopt pneumatic process that the lightweight aggregate concrete mixture in the analyzer is carried out persistent pressure, no longer change until pressure, quietly after the pressure stability stop the 30s release, concrete is emitted and fully mix is even, use direct-reading air content analyzer, test is the air content of each in the lightweight aggregate concrete after pressurizeing, and tests the lightweight aggregate concrete slump again, whether satisfies the pumping construction requirement to judge lightweight aggregate concrete; Concrete steps are as follows:
(1) clean air content analyzer amount alms bowl and alms bowl interior surface with wet cloth, and the amount of making alms bowl is horizontal positioned;
(2) with in the uniform charge weight alms bowl of fresh concrete mix, make slightly surmount alms bowl mouth of concrete mix, carry out jolt ramming then, jolt ramming comprises following dual mode:
During 1) with shaking table jolt ramming, control shaking table vibration frequency 50HZ, amplitude 0.5 ± 0.1mm when unloaded, in the vibration processes as the concrete mix amount of the being lower than alms bowl mouth that sinks, then should add the concrete mix at any time, it is smooth to be vibrated to concrete surface, present the glaze light time namely stop the vibration;
During 2) with the tamper tamping, dividing the concrete mix three times packs into, after each tamping 1/3rd of the concrete mix amount of accounting for alms bowl volume, during tamping for the first time, tamper should run through whole concrete mix, last inserting when smashing, and tamper should insert the material degree of depth 10-20mm that packs into for the first time, after every layer of tamping, the tamper pad about amount alms bowl lower curtate alternately the top hit ground 15 times;
(3) after jolt ramming or tamping finish, should there be depression to fill up as oral area immediately with the unnecessary concrete mix of the floating rule amount of scraping off alms bowl oral area, uses trowel floating then;
(4) amount of cleaning alms bowl and alms bowl lid edge is put in O shape rubber seal in the groove at alms bowl lid edge, covers on amount alms bowl mouth, uses clamp, makes it to keep impermeability, and checks level with level meter;
(5) with inflating pressurization in the inflator pump vector alms bowl, control inflator pump gauge pressure reaches 6MPa, closes the valve that connects inflator pump, around the wooden Chui amount of rapping alms bowl, make pressure be uniformly distributed in sample everywhere, open the inflator pump valve again and make the inflation gauge pressure keep 6MPa, repetitive operation, till the rain glass pointer is no longer mobile, after stablizing 30s, open vent valve, the amount of making alms bowl is decompressed to normal pressure, unclamp clip, take off the alms bowl lid;
(6) the concrete mix sample in the amount of the pouring out alms bowl, and fully mix is even, carries out the concrete slump test again, by the concrete slump after the pressurization is tested to judge whether concrete has the pumpability energy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806745A (en) * | 2016-03-18 | 2016-07-27 | 中国建筑股份有限公司 | Device and method for detecting working performance of pervious concrete |
| CN112525759A (en) * | 2020-11-23 | 2021-03-19 | 中建商品混凝土有限公司 | Device and method for rapidly testing pressure water absorption ratio of lightweight aggregate |
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| CN201116909Y (en) * | 2007-08-31 | 2008-09-17 | 无锡建仪仪器机械有限公司 | Number directly reading concrete mixture gas content analyzer |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806745A (en) * | 2016-03-18 | 2016-07-27 | 中国建筑股份有限公司 | Device and method for detecting working performance of pervious concrete |
| CN112525759A (en) * | 2020-11-23 | 2021-03-19 | 中建商品混凝土有限公司 | Device and method for rapidly testing pressure water absorption ratio of lightweight aggregate |
| CN112525759B (en) * | 2020-11-23 | 2022-07-15 | 中建商品混凝土有限公司 | Device and method for rapidly testing pressure water absorption ratio of lightweight aggregate |
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Application publication date: 20130807 |