CN104631260A - Upper-layer and lower-layer joined-paving construction method of cement stabilized macadam - Google Patents
Upper-layer and lower-layer joined-paving construction method of cement stabilized macadam Download PDFInfo
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- CN104631260A CN104631260A CN201510084839.2A CN201510084839A CN104631260A CN 104631260 A CN104631260 A CN 104631260A CN 201510084839 A CN201510084839 A CN 201510084839A CN 104631260 A CN104631260 A CN 104631260A
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Abstract
The invention provides an upper-layer and lower-layer joined-paving construction method of cement stabilized macadam. The upper-layer and lower-layer joined-paving construction method comprises the following steps: (a) paving a lower layer, namely, paving a lower-layer cement stabilized macadam mixture layer on a pavement, grinding the lower-layer cement stabilized macadam mixture layer; and (b) paving an upper layer, namely, within 12 hours since mixing of a cement stabilized macadam mixture of the lower-layer cement stabilized macadam mixture layer, paying an upper-layer cement stabilized macadam mixture layer on the upper surface of the lower-layer cement stabilized macadam mixture layer formed by rolling, and rolling the upper-layer cement stabilized macadam mixture layer. According to the upper-layer and lower-layer joined-paving construction method of the cement stabilized macadam, provided by the invention, the interlayer bonding strength is ensured, the interlayer construction time can be relatively prolonged, and the construction efficiency is improved.
Description
Technical field
The present invention has about a kind of cement stabilized macadam levels connection paving construction method, especially has the cement stabilized macadam levels connection paving construction method about the determination time delay applied in a kind of road construction.
Background technology
At present, cement stabilized macadam subbase, basic unit's design gross thickness are generally about 54cm ~ 60cm, and there are two kinds of construction methods in prior art, one adopts large-scale laying equipment, heavy rolling apparatus once through moulding technology, and another kind is construction in layer.
For the technique adopting large-scale laying equipment, heavy rolling apparatus disposal molding, there is following shortcoming:
1) by restrictions such as plant capacities, molding thickness has certain limitation, and the maximum depth of spread of application is at present 39.6cm, and its maximum depth of spread is no more than 40cm, can not meet the requirement of design gross thickness 54cm ~ 60cm, this technique cannot carry out disposable paving;
2) there is certain impact to substructure, works and surrounding enviroment in heavy rolling apparatus, and its application exists certain limitation;
3) rolling layers upper part, lower part degree of compaction are uneven, and there is rolling layers upper part ultra dense, rolling layers lower part does not still reach the situation of degree of compaction;
4) the large-scale laying equipment adopted, heavy rolling apparatus cost are higher, and type is still rare both at home and abroad.
For construction in layer method, the domestic main method adopting two kinds of levels connection pavings at present, a kind of is be confined within the scope of the initial setting time of Cement Stable Macadam Mixture, usually from mix, in 4 hours window, completes upper strata construction at the Cement Stable Macadam Mixture of lower floor; Another kind is after lower floor has constructed, health 7 days, core boring sampling, can the Cement Stable Macadam Mixture on making upper strata through after the assay was approved.
In this construction in layer method, within the initial setting time of Cement Stable Macadam Mixture, usually at the Cement Stable Macadam Mixture of lower floor from mix in 4 hours window, there is following shortcoming in the method for carrying out upper strata connection paving:
1) construction joint is many: for ensureing to complete upper strata making within the initial setting time of the Cement Stable Macadam Mixture of lower floor, needs to shorten construction paragraph, causes construction joint many like this, affects surface evenness;
2) efficiency of construction is low: because construction paragraph is short, construction machinery usually need be return seam crossing and again start to walk, and causes construction machinery to move frequently, and road roller and paver etc. exist construction interference, cause efficiency of construction low; Meanwhile, because construction joint is many, cause construction discontinuous, also will affect efficiency of construction;
3) there is limitation in construction: due to construction mix, transport, pave, each construction link such as to roll and have continuity, all linked with one another, which link goes wrong and all will causing construction interruption.This levels connection laying method affects comparatively greatly (at the Cement Stable Macadam Mixture of lower floor from mix within 4 hours) by time limitation, be easy to the initial setting time situation occurring exceeding Cement Stable Macadam Mixture, causing connection paving to be interrupted, there is certain difficulty and limitation in construction.
In this construction in layer method, according to " highway road surface construction technique normalizing " JTJ034-2000: " for ensureing bond strength between layers; the broken basic unit of cement stabilizing adopts construction in layer both at home and abroad at present; need health 7 days; when reaching the construction of the Cement Stable Macadam Mixture carrying out upper strata after some strength; should spread a small amount of cement or cement paste ", mainly there is following shortcoming in it:
1) conditioned time is long: after lower floor has constructed, usual health 7 days, core boring sampling, and through after the assay was approved can the Cement Stable Macadam Mixture on making upper strata, between upper strata and lower floor, interval time be long, affects construction speed;
2) construction in layer, every layer all needs to carry out watering moisture-keeping maintaining, increases maintenance cost; Get core effect according to scene is actual, levels is difficult to be bonded to entirety;
3) interlayer interval time is long, easily pollutes, and affects interlaminar bonding.
Therefore, be necessary to provide a kind of new construction method, overcome above-mentioned defect.
Summary of the invention
The object of this invention is to provide a kind of cement stabilized macadam levels connection paving construction method, ensure that bond strength between layers, can engineering time between prolonged layer relatively, improve efficiency of construction.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
The invention provides a kind of cement stabilized macadam levels connection paving construction method, it comprises the steps:
A) lower floor is laid: set a layer Cement Stable Macadam Mixture layer on upper berth, road surface, roll described lower floor Cement Stable Macadam Mixture layer;
B) upper strata is laid: at the Cement Stable Macadam Mixture of described lower floor Cement Stable Macadam Mixture layer from mix within 12 hours, complete at the upper surface of the described lower floor Cement Stable Macadam Mixture layer of roller-compaction and lay upper strata Cement Stable Macadam Mixture layer, roll described upper strata Cement Stable Macadam Mixture layer.
In a preferred embodiment, described step a) and described step b) between also comprise step a1) spread cement paste: when laying described upper strata Cement Stable Macadam Mixture layer after the final setting time of the Cement Stable Macadam Mixture of described lower floor Cement Stable Macadam Mixture layer, need at the upper surface spread cement paste of described lower floor Cement Stable Macadam Mixture layer.
In a preferred embodiment, at described step a1) in, the spread quantity of described cement paste is 0.5kg/m
2~ 1.0kg/m
2.
Feature and the advantage of cement stabilized macadam levels connection paving construction method of the present invention are: this cement stabilized macadam levels connection paving construction method, determine the construction control time, start at from mix at the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer, the construction of upper strata Cement Stable Macadam Mixture layer is completed within 12 hours window, it can not have an impact to the intensity of lower floor's Cement Stable Macadam Mixture layer and globality, simultaneously because the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer is in this time range, still there is certain plasticity, therefore Cement Stable Macadam Mixture layer in upper strata can effectively embed in lower floor's Cement Stable Macadam Mixture layer by vibratory compaction, add interlaminar bonding, effectively reduce interlayer contamination simultaneously, effectively ensure that the globality of levels, secondary vibration compacting is more conducive to the closely knit of lower floor's Cement Stable Macadam Mixture layer, be conducive to the increase of lower floor's Cement Stable Macadam Mixture layer intensity.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of cement stabilized macadam levels of the present invention connection paving construction method.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the invention provides a kind of cement stabilized macadam levels connection paving construction method, it comprises the steps:
A) lower floor is laid: set a layer Cement Stable Macadam Mixture layer on upper berth, road surface, roll described lower floor Cement Stable Macadam Mixture layer;
B) upper strata is laid: at the Cement Stable Macadam Mixture of described lower floor Cement Stable Macadam Mixture layer from mix within 12 hours, complete at the upper surface of the described lower floor Cement Stable Macadam Mixture layer of roller-compaction and lay upper strata Cement Stable Macadam Mixture layer, roll described upper strata Cement Stable Macadam Mixture layer.
Specifically, carry out step a) before, need carry out preparation of construction work, it mainly comprises: construction lofting, mixing and transport.
Wherein, construction lofting is after supervising engineer agrees to, on the roadbed of acceptance(check), start subbase setting-out, before subbase setting-out, workshop section technician need check preparation operation side, remove the foreign material on surface, effects on surface is suitably sprinkled water moistening, for the position that surface is loose, after first being struck off by unconsolidated formation with land leveller, appropriate watering, steamroller is smooth; Afterwards, survey crew recovers center line in advance, on roadbed straightway, every 10m establishes a king-pile, in roadbed horizontal curve section, every 5m establishes a king-pile, beat timber in roadbed both sides apart from subbase design width 30cm ~ 40cm place and carry out horizontal survey, after calculating construction section hanging wire altitude data, handing over field technician's (within the scope of end of the bridge, subbase absolute altitude will survey absolute altitude adjustment according to bridge floor).Concrete, absolute altitude control line adopts diameter to be that the steel wire of 2mm ~ 3mm is as baseline, stretch-draw length is good with 100m ~ 200m, and in the two ends turnbuckle tensioning simultaneously of absolute altitude control line, must avoid because steel wire is not tight and produce amount of deflection, special messenger should be had between whole operational period to keep an eye on, forbid to touch steel wire, recover immediately when noting abnormalities, technician should dig-in job site, often checks steel wire absolute altitude; King-pile adopts drill rod, and it selects the plain bar that to have compared with the diameter of large rigidity be 16mm ~ 18mm to process, and joins fixed mount, and fixed mount adopts screw thread as well, is convenient to dismounting and adjustment absolute altitude; Side form is arranged on the both sides of roadbed, and it adopts punching block to make, punching block 4m mono-section, and be highly 15cm, outside drill rod is fixed.
After construction lofting is ready, carry out mixing step: specifically, carry out the mix of Cement Stable Macadam Mixture in strict accordance with the match ratio of supervising engineer's reply during construction, and by the regulation of existing " requirement of road base layer construction technical specification ", during mix, Cement Stable Macadam Mixture suitably increases by 0.5%.Test room should shift to an earlier date the water content of gathering materials in checkout area everywhere, determines the coordination in works on the same day.Water content is an important Con trolling index in Cement Stable Macadam Mixture, strictly control, must adjust watering quantity according to water content, weather condition and transportation range.According to raw-material moisture determination result and Mixture Ratio before mix, the initial water content of prediction compound.If initial water content is less than construction requirement value, then added water when mixing and stirring; If initial water content is greater than construction requirement value, then must not construct; Match ratio advice note is duplicate, a friendship blending station, another part of blending station signature Hou Liu test room.Working cement dose considers the impact of construction discreteness, and comparatively design load increases by 0.5%, in the process of mixing and stirring blending station person in charge should observe at any time Cement Stable Macadam Mixture mix and stir after color, prevent Cement Stable Macadam Mixture from blocking and do not flow.Test room will arrange special messenger to monitor blending station, by the sampling observation of regulation frequency cement dose, water content and grating, and shaping compression strength test, the cement consumption that test person in charge is total according to cement used, the gauge that gathers materials.
After Cement Stable Macadam Mixture mix, transport.Specifically, this Cement Stable Macadam Mixture adopts tipping truck transport, and the quantity of dump truck is 15.At when filling with substance, dump truck will move forward and backward, and avoids the formation of cone and causes the segregation that gathers materials, if temperature is higher, road is comparatively far away, wind-force is comparatively large, then needs to cover Cement Stable Macadam Mixture, evaporates to avoid moisture.Conscientiously should fill in concrete release sheet during issuance of materials, content comprises license number, lorry mounted mixer discharging time, tonnage.Bring to paving site by driver, should be checked check and accept by rewinding personnel, the strict Cement Stable Macadam Mixture that controls is no more than prescribed limit from mixing and stirring to the time delay of rolling end of a period.In transit must not discharging or stop without reason, can turn around on opening part or bridge floor, avoid destroying sub-layer.When paving site is far away apart from mixing station, Cement Stable Macadam Mixture should add covering in transportation, reduces moisture loss.Want clout in cleaning compartment at paving site, discharging is wanted thoroughly, in order to avoid shed along road, causes waste and pollutes.Construction period will strengthen AM/BAM contact, specifies transit route, carries out that necessary watering is wetting, maintenance and maintenance to transit route.Carry out the draining of transport routes, prevent damaged or destroyed by flood, answer running check in the supervisor of foreground in construction, eliminate dust pollution and transport disorders in time, guarantee the unimpeded of transportation route.
After above-mentioned preparation, carry out step and a) lay lower floor: set a layer Cement Stable Macadam Mixture layer on upper berth, road surface, roll described lower floor Cement Stable Macadam Mixture layer.Specifically, stock ground starts a mixing station by the discharging of subbase construction match ratio, and two pavers are parallel in place, is first sprinkled water by sub-layer moistening, but not ponding, when haul vehicle reaches 6 ~ 8, start paving of lower floor's Cement Stable Macadam Mixture layer.The platen elevation of paver is controlled the coefficient of loose laying height determined at test section, utilize paver on the wire arranged, evenly pave, feeler lever sensor controls the subbase slope gradient in length and breadth automatically.Tipping truck sternway, to the discharging of paver feeding hopper, starts feeder simultaneously, when doses is sufficient between two side shields, namely starts paver and paves equably.When First paver paves 5m ~ 8m distance, second paver starts to pave, and keep above-mentioned distance in paving process always, avoid hypertelorism to cause and connect a batch out-of-flatness, thickness gathers materials segregation phenomenon, distance too closely easily causes the mutual interference between paver, transport vehicle.Spreading speed controls at 2m/min ~ 3m/min.The travel speed of paver to be kept in paving process even, avoid the shutdown that midway is unnecessary, start immediately to roll after paving, repairing.
When rolling, roadbed straightway is rolled by two side direction Lu Zhizheng, if during roadbed curved section superelevation, rolled to high side by downside.Roll the principle following " behind first gently rear heavy, first rear fast, first limit slowly, medium, high frequency by a narrow margin, from low to high " to carry out, rolling speed and number of rolling obtain parameter according to test section to carry out.First road roller static pressure one time within the scope of overall with, rolling speed controls at 1.5km/h ~ 2km/h, to be shaken pressure twice by vibratory roller again, rolling speed is 2.0km/h ~ 2.5km/h, then voltage stabilizing one time, rolling speed is 2.0km/h ~ 3.0km/h, finally rolls twice with pneumatic-tired rollers, receives halo mark.Roll rear timely 3m ruler and carried out planeness detection, if any the phenomenon such as " spring ", " loose ", " peeling ", " bag is gathered around in local ", processed immediately.
After step a) is carried out, carry out step b) lay upper strata: at the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer from mix within 12 hours, complete at the upper surface of the described lower floor Cement Stable Macadam Mixture layer of roller-compaction and lay upper strata Cement Stable Macadam Mixture layer, roll described upper strata Cement Stable Macadam Mixture layer.Also namely, Cement Stable Macadam Mixture layer in upper strata need have been laid within 12 hours from mix at the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer.
Further, cement stabilized macadam levels connection paving construction method of the present invention is not limited only to bilevel paving and lays, the present invention also can carry out the laying of three layers or more layers, as long as the paving mode of the Cement Stable Macadam Mixture of adjacent two layers all can be constructed by method of the present invention.In one embodiment, when needing to lay third layer Cement Stable Macadam Mixture layer at the upper surface of upper strata Cement Stable Macadam Mixture layer, laying time of this third layer Cement Stable Macadam Mixture layer should control Cement Stable Macadam Mixture at upper strata Cement Stable Macadam Mixture layer from mix within 12 hours, now, the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer, no longer by time effects, namely no longer considers the time from mix of the Cement Stable Macadam Mixture of lower floor's stabilization gravel mixing bed of material.
Step b) carry out after, carry out health step: health adopts geotextiles health.Upper strata Cement Stable Macadam Mixture layer has rolled and after degree of compaction passed examination, has covered geotextiles immediately.Within this stage, require the surface sprinkler health of upper strata Cement Stable Macadam Mixture layer, number of times of sprinkling water every day depending on weather, but should require that the surface of upper strata Cement Stable Macadam Mixture layer between whole preserving period keeps moisture state.Forbid in preserving period that other vehicles travel thereon.The shower nozzle atomizing on sprinkling truck, not handy high voltage type jet pipe, in order to avoid destroy base layer structure.Basic unit's preserving period is no less than 7 days.
Finally the seam crossing between the mixing bed of material paving complete is processed: the quality of joint treatment is the key of Base of Cement Stabilized Crushed Stone Mixture quality, especially more should arouse attention in three layers of continuous paving process.
The process of transverse joint: paver pave Cement Stable Macadam Mixture time, avoid random interruption as far as possible, paver interrupts paving more than 2 hours for some reason or the same day will arrange transverse joint at the end of active section, paver sails out of the Cement Stable Macadam Mixture end paved, roll end after compacting and form a slope, pave before new Cement Stable Macadam Mixture, seam crossing planeness is detected with 3m ruler, along perpendicular to Lu Zhizheng line direction, defective sections transverse being cut, and then the new Cement Stable Macadam Mixture that paves.Rolling of seam crossing as emphasis, should roll Shi Yingxian and rolls in direction by the way, then roll along transverse joint direction, ensure the planeness of seam crossing.
Longitudinal joint process: become echelon to pave with two pavers when paving, does not stay longitudinal joint in the middle of ensureing, two paver seam crossings check planeness emphatically simultaneously, and the uneven place of chance is manually levelling.
Cement stabilizing compound transporting, pave, all need to establish special messenger to direct traffic in roller compaction process, especially discharging before commander's transport vehicle that different Cement Stable Macadam Mixture is housed to the paver of specifying, and forbid that any vehicle is exercised in the basic unit paved.
According to an embodiment of the present invention, described step a) and described step b) between also comprise step a1) spread cement paste: when laying upper strata Cement Stable Macadam Mixture layer after the final setting time of the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer, need at the upper surface spread cement paste of lower floor's Cement Stable Macadam Mixture layer, the spread quantity of this cement paste is 0.5kg/m
2~ 1.0kg/m
2.
Specifically, in the construction of Cement Stable Macadam Mixture layer levels connection paving, when carrying out the construction of the upper water cement-stabilizing broken stone mixing bed of material before the final setting time of the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer, mud of can not sprinkling water between upper strata Cement Stable Macadam Mixture layer and lower floor's Cement Stable Macadam Mixture layer; After the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer exceedes final setting time, need the upper surface spread cement paste to lower floor's Cement Stable Macadam Mixture layer in theory, its spread quantity is greater than 0.5kg/m
2, that is, consider the impact of construction discreteness, the spread quantity of cement paste should control at 0.5kg/m
2~ 1.0kg/m
2for good.
Cement stabilized macadam levels connection paving construction method of the present invention, lower floor's Cement Stable Macadam Mixture layer pave construction complete, must ensure that Cement Stable Macadam Mixture at lower floor's Cement Stable Macadam Mixture layer is within mix starts at 12 hours window, completes the upper strata Cement Stable Macadam Mixture layer that paves.Generally determine according to field condition bout length of constructing during construction.Such as shorter between two works, upper strata Cement Stable Macadam Mixture layer complete engineering time of constructing can control within 12 hours, then carry out construction for good with works paragraph; If construction working face is longer, then principle of controlling by time variable is carried out, and leaves more than needed, avoids unfavorable factor to affect and causes construction to be interrupted.
This cement stabilized macadam levels connection paving construction method determines the construction control time, start at from mix at the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer, the construction of upper strata Cement Stable Macadam Mixture layer is completed within 12 hours window, it can not have an impact to the intensity of lower floor's Cement Stable Macadam Mixture layer and globality, simultaneously because the Cement Stable Macadam Mixture of lower floor's Cement Stable Macadam Mixture layer is in this time range, still there is certain plasticity, therefore Cement Stable Macadam Mixture layer in upper strata can effectively embed in lower floor's Cement Stable Macadam Mixture layer by vibratory compaction, add interlaminar bonding, effectively reduce interlayer contamination simultaneously, effectively ensure that the globality of levels, secondary vibration compacting is more conducive to the closely knit of lower floor's Cement Stable Macadam Mixture layer, be conducive to the increase of lower floor's Cement Stable Macadam Mixture layer intensity.
The connection of levels Cement Stable Macadam Mixture layer paving was brought up to 12 hours by 4 hours time delay by the present invention, avoid the phenomenon that upper strata Cement Stable Macadam Mixture layer construction is interrupted, also lower floor's Cement Stable Macadam Mixture formable layer bout length can be increased, ensure that continuous, long paragraph is constructed, namely ensure that construction quality, turn improve operating efficiency, shorten the construction period, improve operation rate of machinery, optimize construction organization, saved cost.
In addition, the present invention determines in the construction of Cement Stable Macadam Mixture bilayer (or multilayer) connection paving, different time delay, different cement spread quantity between levels construction layer, can more accurate organizing construction produce, guarantee that interlayer cement spread quantity meets construction requirement, there will not be the situation that spread quantity is too much or very few, ensure that construction quality, save construction cost.
This invention has breakthrough, the boundary of upper strata construction can not be carried out again after having broken the initial set of traditional cements stabilization gravel compound, for long paragraph, the continuously construction of Cement Stable Macadam Mixture layer provide foundation, namely effectively ensure construction quality, turn improve operating efficiency, saved cost.
The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various change or modification to the embodiment of the present invention according to content disclosed in application documents and not depart from the spirit and scope of the present invention.
Claims (3)
1. a cement stabilized macadam levels connection paving construction method, it is characterized in that, it comprises the steps:
A) lower floor is laid: set a layer Cement Stable Macadam Mixture layer on upper berth, road surface, roll described lower floor Cement Stable Macadam Mixture layer;
B) upper strata is laid: at the Cement Stable Macadam Mixture of described lower floor Cement Stable Macadam Mixture layer from mix within 12 hours, complete at the upper surface of the described lower floor Cement Stable Macadam Mixture layer of roller-compaction and lay upper strata Cement Stable Macadam Mixture layer, roll described upper strata Cement Stable Macadam Mixture layer.
2. cement stabilized macadam levels connection paving construction method as claimed in claim 1, it is characterized in that, described step a) and described step b) between also comprise step a1) spread cement paste: when laying described upper strata Cement Stable Macadam Mixture layer after the final setting time of the Cement Stable Macadam Mixture of described lower floor Cement Stable Macadam Mixture layer, need at the upper surface spread cement paste of described lower floor Cement Stable Macadam Mixture layer.
3. cement stabilized macadam levels connection paving construction method as claimed in claim 2, is characterized in that, at described step a1) in, the spread quantity of described cement paste is 0.5kg/m
2~ 1.0kg/m
2.
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| CN105948595A (en) * | 2016-06-02 | 2016-09-21 | 山东省交通科学研究院 | Anti-segregation skeleton compactness cement-stabilized macadam mixture and application and paving methods thereof |
| CN108486979A (en) * | 2018-03-28 | 2018-09-04 | 中交公局第三工程有限公司 | Cement stabilized macadam construction Craft |
| CN110172887A (en) * | 2019-06-26 | 2019-08-27 | 中国十九冶集团有限公司 | One-step forming construction method for large-width large-thickness water stabilization layer |
| CN111172845A (en) * | 2020-01-06 | 2020-05-19 | 陕西中大力鼎科技有限公司 | Double-layer synchronous continuous-paving continuous-pressing integral forming construction method for water-stable large-thickness double-unit |
| CN112942007A (en) * | 2021-02-25 | 2021-06-11 | 闫相明 | Construction process of super-thick wide cement stabilized macadam base |
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Application publication date: 20150520 |