CN102505586A - Construction method of low-shrinkage and self-compacting concrete - Google Patents
Construction method of low-shrinkage and self-compacting concrete Download PDFInfo
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- CN102505586A CN102505586A CN2012100004094A CN201210000409A CN102505586A CN 102505586 A CN102505586 A CN 102505586A CN 2012100004094 A CN2012100004094 A CN 2012100004094A CN 201210000409 A CN201210000409 A CN 201210000409A CN 102505586 A CN102505586 A CN 102505586A
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Abstract
The invention discloses a construction method of low-shrinkage and self-compacting concrete, which can ensure stable performances of the low-shrinkage and self-compacting concrete during the construction process, can enable all process steps to meet the requirements and can reach the expected performance requirements after forming. The construction method disclosed by the invention has the positive effects that large-scale professional equipment is not required and the current ordinary concrete construction equipment can be used, therefore equipment investment fund can be effectively reduced and the construction cost can be reduced; and furthermore, the construction method has the advantages of good effects, simple process steps and capability of not only meeting the construction period requirement, but also meeting the requirements on construction operability.
Description
Technical field
The present invention relates to non-fragment orbit, especially relate to a kind of ballastless track adjustment layer with the low self-compact concrete in construction method of shrinking.
Background technology
The low self-compacting concrete that shrinks belongs to a kind of new material at building field, has plurality of advantages: guarantee that concrete is closely knit well; Enhance productivity; Improve working environment and safety; Improve concrete surface quality; The wearing and tearing of having avoided vibrating template being produced; Reduce the wearing and tearing of concrete to mixer; Possibly reduce the engineering overall cost; Reduce cost from improving many aspects such as speed of application, environment limits, reduces artificial to noise and ensure the quality of products.And in self-compacting concrete use field, be mostly that the room is built and bridge strengthening, the consumption of this two aspect is all less, so self-compacting concrete does not form good construction technology and the job practices of a cover.And self-compacting concrete has and the ordinary concrete different characteristic, in work progress, if there is violation operation, then very easily lowers the quality of self-compacting concrete.
Summary of the invention
Goal of the invention of the present invention is: a kind of low contraction self-compact concrete in construction method is provided, can have guaranteed low stable performance of shrinking self-compacting concrete in the work progress, each procedure all reaches and meets the demands, and reaches the estimated performance requirement after the moulding.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopted is following: a kind of low contraction self-compact concrete in construction method comprises the steps:
The first step, low shrink the self-compacting concrete raw material and mix selecting for use of control equipment:
(1) raw material comprise: cement, mineral admixture, fines, coarse aggregate, Admixture, water and expansion agent;
(2) adopting the system of per hour mixing more than 90 cubic metres, single mixed capacity is the control equipment of mixing more than 1.5 cubic metres; And mix the weighing maximum allowable offset of the meausring apparatus of control equipment: cement, mineral admixture and expansion agent are ± 1%; Admixture is ± 1%; Fines and coarse aggregate are ± 2%, and water is ± 1%;
Prepare and mix the system self-compacting concrete before second step, the low contraction self-compacting concrete system of mixing:
(1) calculates the low required water content ratio of aggregate of self-compacting concrete that shrinks, calculate the construction match ratio of self-compacting concrete according to water content ratio of aggregate;
(2) mix the system self-compacting concrete based on low construction match ratio of shrinking self-compacting concrete, in mixing the system process, need situation of change, the low construction match ratio of shrinking self-compacting concrete of adjustment in time based on water content ratio of aggregate;
(3) low contraction self-compacting concrete mixing time is 150s～180s;
The 3rd step, transportation self-compacting concrete:
(1) before the transportation self-compacting concrete, the residue in the transportation tank car tank body, residual water are all emitted, and carry out wetting the tank body of drying;
(2) after transportation tank car is packed self-compacting concrete into, just let tank body rotate along feeding manner, let the low self-compacting concrete that shrinks in transportation, ceaselessly stir, segregation, excreting water phenomenon appear to prevent the low self-compacting concrete that shrinks;
(3) the low self-compacting concrete transportation tank car that shrinks carries water reducing agent with car, and shrinks self-compacting concrete to use water reducing agent be same model and same batch with this batch is low;
The 4th step, track plate underlayer is carried out wetting, circulating water occurs and be not as the criterion but wetness degree forms moisture film and mat surface with track plate underlayer surface;
The 5th step, the low self-compacting concrete that shrinks pour into:
(1) measures the divergence of the low contraction self-compacting concrete reach the spot with slump bucket, confirm whether the low self-compacting concrete that shrinks of this batch meets the perfusion condition that divergence is 650mm～750mm;
(2) the low self-compacting concrete that shrinks is adjusted, made low its performance indications of shrinking self-compacting concrete meet the perfusion requirement;
(3) concrete pumping equipment carries out before shrinking self-compacting concrete wettingly in that pumping is low with clear water or mortar, circulating water occurs and is not as the criterion but wetness degree forms moisture film and pump line inner wall surface with the pump line inner wall surface on the concrete pumping equipment;
(4) adopt the low self-compacting concrete irrigator that shrinks to hang down the perfusion of contraction self-compacting concrete, the rate of pumping and the pumping pressure of the low contraction of strict control self-compacting concrete;
The 6th step, the low self-compacting concrete that shrinks are wiped one's face and maintenance:
(1) the low self-compacting concrete design perfusion face height that shrinks is higher than track plate bottom surface 10mm;
(2) after the perfusion of low contraction self-compacting concrete is accomplished, unnecessary low contraction self-compacting concrete is scooped out;
(3) with trowel self-compacting concrete is carried out face work;
(4) treat low shrink the self-compacting concrete initial set before, with trowel the low self-compacting concrete that shrinks is carried out quadric-plastering, guarantee low smooth, the thin portion of the self-compacting concrete integral surface rough surface that shrinks;
(5) with cladding material self-compacting concrete is covered, treat low shrink the self-compacting concrete initial set after, the maintenance work of sprinkling water.
Said tank body to drying of the 3rd step carries out wetting method and is: let the transportation tank car tank body rotate along feeding manner; Then clear water is added from the tank body charging aperture; Let tank body rotation 10～30 change; Then tank body is rotated along discharge method, the clear water in the tank body is poured out, then accomplish the wetting work of tank body.
The 5th step, the said method that low contraction self-compacting concrete is adjusted was: when divergence is lower than 650mm, improve low divergence of shrinking self-compacting concrete through adding the water reducing agent that carries with car, reach the perfusion condition until divergence; When divergence is higher than 750mm, reduces the low moisture that shrinks self-compacting concrete through prolonging the perfusion stand-by period, thereby reduce its divergence; Divergence does not reach the perfusion requirement yet in 2 hours after this batch hangs down the contraction self-compacting concrete to mix the system completion, and then the low contraction of this batch self-compacting concrete is done and scrapped processing.
Said low contraction self-compacting concrete irrigator comprises three discharging openings; Each discharging opening can be controlled the low flow velocity that shrinks self-compacting concrete; Thereby the low pressure that shrinks after self-compacting concrete gets into reperfusion space of control shrinks because of low that the too fast or pressure of self-compacting concrete flow velocity is excessive to be caused the fixed object distortion and be shifted when preventing to pour into.
Compared with prior art, the invention has the beneficial effects as follows: the present invention utilizes existing ordinary concrete construction equipment, need not buy large-scale professional equipment, and effectively reduction equipment drops into fund, reduces construction cost; And respond well, operation is simple, can satisfy construction period, can satisfy the requirement of construction operability again.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is construction process figure of the present invention.
The specific embodiment
A kind of low contraction self-compact concrete in construction method, as shown in Figure 1, comprise the steps:
The first step, low shrink the self-compacting concrete raw material and mix selecting for use of control equipment:
1, choices of raw materials:
(1), cement: adopt P.O 42.5 Portland cements.
(2), mineral admixture: be flyash, fine-ground fly-ash and slag powders, wherein: it is the I level that flyash and fine-ground fly-ash adopt grade; Slag powders adopts the S95 grade slag powder.
(3), fines: thick level fines in the employing, fineness modulus is 2.6～3.0.
(4), coarse aggregate: adopting particle diameter is clean rubble or the crushed gravel of 5～10mm.
(5), Admixture: adopt the efficient polycarboxylate water-reducer of retardation setting type.
(6), water: adopt drinking water.
(7) expansion agent: adopt common expansion agent.
2, mix selecting for use of control equipment
The system of mixing is low shrinks the control equipment of mixing of self-compacting concrete to adopt the system of per hour mixing more than 90 cubic metres, single mixed capacity is the concrete mixing machinery more than 1.5 cubic metres.
Mix the weighing maximum allowable offset of the meausring apparatus of control equipment: cementitious material (cement, mineral admixture, expansion agent) is ± 1%, and Admixture is ± 1%, and fines and coarse aggregate are ± 2%, and water is ± 1%.
Employing is mixed the big mixing apparatus of system ability and can be improved and mix system efficient; Because it is longer that low contraction self-compacting concrete single is mixed the system time; The concrete of mixing 12 cubic metres in system one car needs 24 minutes; Mix system efficient efficiently and can effectively improve the concrete overall performance of a car, the weighing error of mixing the big mixing apparatus of system ability simultaneously is lower, can effectively guarantee concrete performance.
Prepare and mix the system self-compacting concrete before second step, the low contraction self-compacting concrete system of mixing.
(1) calculates the low required water content ratio of aggregate of self-compacting concrete that shrinks, calculate the construction match ratio of self-compacting concrete according to water content ratio of aggregate;
(2) mix the system self-compacting concrete according to low construction match ratio of shrinking self-compacting concrete; And carry out quality control; Situation of change according to water content ratio of aggregate; In time adjust low construction match ratio of shrinking self-compacting concrete, prevent low phenomenon of shrinking self-compacting concrete because of the fluctuation appearance and the performance reduction of water content ratio of aggregate.
(3) low contraction self-compacting concrete mixing time is 150s～180s.
The 3rd step, transportation self-compacting concrete
(1) transportation tank car should all be emitted the residue in the tank body, residual water before the transportation self-compacting concrete; It is wetting that dry tank body is used clear water, and humidity method is: let the transportation tank car tank body rotate along feeding manner, then clear water is added from the tank body charging aperture; Let tank body rotation 10～30 change; Then tank body is rotated along discharge method, the clear water in the tank body is poured out, then accomplish the wetting work of tank body.
(2) transportation tank car just lets tank body rotate along feeding manner behind the self-compacting concrete that begins to pack into, lets the low stirring that self-compacting concrete does not stop in transportation of shrinking, and prevents that bad phenomenon such as segregation, bleeding from appearring in the low self-compacting concrete that shrinks;
(3) the low self-compacting concrete transportation tank car that shrinks should carry 10 kilograms of water reducing agents with car, and the water reducing agent that carries with car must shrink self-compacting concrete to use water reducing agent be same model, same batch with this batch is low.When shrinking self-compacting concrete index is undesirable before perfusion, available 10 kilograms of water reducing agents that carry with car carry out the index adjustment, and low perfusion index of shrinking self-compacting concrete is met the requirements, and guarantee the low pouring quality that shrinks self-compacting concrete when low;
The 4th step, track plate underlayer is carried out wetting, avoid low and shrink that dehydration influence mobile performance in the self-compacting concrete flow process, be not as the criterion but wetness degree circulating water occurs with track plate underlayer surface formation moisture film and mat surface.
The 5th step, the low self-compacting concrete that shrinks pour into
(1) measures the divergence of the low contraction self-compacting concrete reach the spot with slump bucket, confirm that this batch hangs down the contraction self-compacting concrete and whether meet the perfusion condition (divergence is 650mm～750mm).
(2) the low self-compacting concrete that shrinks is adjusted; Making low its performance indications of shrinking self-compacting concrete meet perfusion requires: when divergence is lower than 650mm; Can be through adding the way of the water reducing agent that carries with car; Improve low divergence of shrinking self-compacting concrete, reach the perfusion condition until divergence; When divergence was higher than 750mm, the low self-compacting concrete that shrinks of this batch can reduce the low moisture that shrinks self-compacting concrete, thereby reduce its divergence through prolonging the method for perfusion stand-by period; Divergence does not reach the perfusion requirement yet in 2 hours after this batch hangs down the contraction self-compacting concrete to mix the system completion, and then the low contraction of this batch self-compacting concrete is done and scrapped processing.
Above-mentioned steps helps in time grasping low contraction self-compacting concrete quality to be poured into; Make corresponding adjustment in advance; The one, can guarantee the low pouring quality that shrinks self-compacting concrete, the 2nd, can prevent to cross and low or too highly cause concrete pumping equipment phenomenons such as plugging to occur because of low contraction self-compacting concrete divergence;
(3) concrete pumping equipment is used clear water before shrinking self-compacting concrete or mortar is wetting in that pumping is low, circulating water occurs and is not as the criterion but wetness degree forms moisture film and pump line inner wall surface with the pump line inner wall surface on the concrete pumping equipment.
(4) when hanging down the perfusion of contraction self-compacting concrete, should adopt the low self-compacting concrete irrigator that shrinks, low rate of pumping and the pumping pressure that shrinks self-compacting concrete controlled in strictness.Said low contraction self-compacting concrete irrigator comprises three discharging openings; Each discharging opening can be controlled the low flow velocity that shrinks self-compacting concrete; Thereby the low pressure that shrinks after self-compacting concrete gets into reperfusion space of control, when preventing to pour into because of low contraction self-compacting concrete flow velocity the excessive phenomenons such as fixed object distortion, displacement such as model that cause of too fast or pressure.
The 6th step, the low self-compacting concrete that shrinks are wiped one's face and maintenance
(1) the low self-compacting concrete design perfusion face height that shrinks is higher than track plate bottom surface 10mm;
(2) after the perfusion of low contraction self-compacting concrete is accomplished, unnecessary low contraction self-compacting concrete is scooped out, ladled out to design height;
(3) after unnecessary low contraction self-compacting concrete is scooped out, self-compacting concrete is carried out face work with trowel;
(4) treat low shrink the self-compacting concrete initial set before; With trowel the low self-compacting concrete that shrinks is carried out quadric-plastering; Behind the quadric-plastering, low contraction self-compacting concrete integral surface should be smooth, and thin portion surface is suitable coarse; The low phenomenon that ponding appears in the self-compacting concrete surface of shrinking can be effectively prevented like this, the probability that crackle appears in the surface can be reduced simultaneously.
(5) the low contraction after the self-compacting concrete face work accomplishes covers self-compacting concrete with cladding material, treat low shrink the self-compacting concrete initial set after, the maintenance work of sprinkling water prevents that bigger contraction and seminess from appearring in the low self-compacting concrete that shrinks.
Claims (4)
1. one kind low is shunk the self-compact concrete in construction method, it is characterized in that: comprise the steps:
The first step, low shrink the self-compacting concrete raw material and mix selecting for use of control equipment:
(1) raw material comprise: cement, mineral admixture, fines, coarse aggregate, Admixture, water and expansion agent;
(2) adopting the system of per hour mixing more than 90 cubic metres, single mixed capacity is the control equipment of mixing more than 1.5 cubic metres; And mix the weighing maximum allowable offset of the meausring apparatus of control equipment: cement, mineral admixture and expansion agent are ± 1%; Admixture is ± 1%; Fines and coarse aggregate are ± 2%, and water is ± 1%;
Prepare and mix the system self-compacting concrete before second step, the low contraction self-compacting concrete system of mixing:
(1) calculates the low required water content ratio of aggregate of self-compacting concrete that shrinks, calculate the construction match ratio of self-compacting concrete according to water content ratio of aggregate;
(2) mix the system self-compacting concrete based on low construction match ratio of shrinking self-compacting concrete, in mixing the system process, need situation of change, the low construction match ratio of shrinking self-compacting concrete of adjustment in time based on water content ratio of aggregate;
(3) low contraction self-compacting concrete mixing time is 150s～180s;
The 3rd step, transportation self-compacting concrete:
(1) before the transportation self-compacting concrete, the residue in the transportation tank car tank body, residual water are all emitted, and carry out wetting the tank body of drying;
(2) after transportation tank car is packed self-compacting concrete into, just let tank body rotate along feeding manner, let the low self-compacting concrete that shrinks in transportation, ceaselessly stir, segregation, excreting water phenomenon appear to prevent the low self-compacting concrete that shrinks;
(3) the low self-compacting concrete transportation tank car that shrinks carries water reducing agent with car, and shrinks self-compacting concrete to use water reducing agent be same model and same batch with this batch is low;
The 4th step, track plate underlayer is carried out wetting, circulating water occurs and be not as the criterion but wetness degree forms moisture film and mat surface with track plate underlayer surface;
The 5th step, the low self-compacting concrete that shrinks pour into:
(1) measures the divergence of the low contraction self-compacting concrete reach the spot with slump bucket, confirm whether the low self-compacting concrete that shrinks of this batch meets the perfusion condition that divergence is 650mm～750mm;
(2) the low self-compacting concrete that shrinks is adjusted, made low its performance indications of shrinking self-compacting concrete meet the perfusion requirement;
(3) concrete pumping equipment carries out before shrinking self-compacting concrete wettingly in that pumping is low with clear water or mortar, circulating water occurs and is not as the criterion but wetness degree forms moisture film and pump line inner wall surface with the pump line inner wall surface on the concrete pumping equipment;
(4) adopt the low self-compacting concrete irrigator that shrinks to hang down the perfusion of contraction self-compacting concrete, the rate of pumping and the pumping pressure of the low contraction of strict control self-compacting concrete;
The 6th step, the low self-compacting concrete that shrinks are wiped one's face and maintenance:
(1) the low self-compacting concrete design perfusion face height that shrinks is higher than track plate bottom surface 10mm;
(2) after the perfusion of low contraction self-compacting concrete is accomplished, unnecessary low contraction self-compacting concrete is scooped out;
(3) with trowel self-compacting concrete is carried out face work;
(4) treat low shrink the self-compacting concrete initial set before, with trowel the low self-compacting concrete that shrinks is carried out quadric-plastering, guarantee low smooth, the thin portion of the self-compacting concrete integral surface rough surface that shrinks;
(5) with cladding material self-compacting concrete is covered, treat low shrink the self-compacting concrete initial set after, the maintenance work of sprinkling water.
2. low contraction self-compact concrete in construction method according to claim 1; It is characterized in that: said tank body to drying of the 3rd step carries out wetting method and is: let the transportation tank car tank body rotate along feeding manner; Then clear water is added from the tank body charging aperture, let tank body rotation 10～30 change, then tank body is rotated along discharge method; Clear water in the tank body is poured out, then accomplished the wetting work of tank body.
3. based on the described low contraction self-compact concrete in construction method of claim 1; It is characterized in that: the 5th step, the said method that low contraction self-compacting concrete is adjusted was: when divergence is lower than 650mm; Improve low divergence of shrinking self-compacting concrete through adding the water reducer that carries with car, reach the perfusion condition until divergence; When divergence is higher than 750mm, reduces the low moisture that shrinks self-compacting concrete through prolonging the perfusion stand-by period, thereby reduce its divergence; Divergence does not reach the perfusion requirement yet in 2 hours after this batch hangs down the contraction self-compacting concrete to mix the system completion, and then the low contraction of this batch self-compacting concrete is done and scrapped processing.
4. low contraction self-compact concrete in construction method according to claim 1; It is characterized in that: said low contraction self-compacting concrete irrigator comprises three discharging openings; Each discharging opening can be controlled the low flow velocity that shrinks self-compacting concrete; Thereby the low pressure that shrinks after self-compacting concrete gets into reperfusion space of control shrinks because of low that the too fast or pressure of self-compacting concrete flow velocity is excessive to be caused the fixed object distortion and be shifted when preventing to pour into.
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| CN103790083A (en) * | 2014-02-26 | 2014-05-14 | 中铁五局（集团）有限公司 | Construction technology of self-compacting concrete filling layer of plate type ballastless track of high-speed railway |
| CN104631232A (en) * | 2015-01-06 | 2015-05-20 | 邵冠慧 | Integrated pouring device for installation of rail column type inspection pit fastening system |
| CN108894097A (en) * | 2018-07-20 | 2018-11-27 | 武汉理工大学 | A kind of mixed combination pier consolidation structure of steel- |
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| CN108894097A (en) * | 2018-07-20 | 2018-11-27 | 武汉理工大学 | A kind of mixed combination pier consolidation structure of steel- |
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Application publication date: 20120620 |