Construction scheme of road slurry seal

1.Stores reserve

1.1、asphalt:70#A level asphalt。
1.2、emulsified asphalt:PCR cationic、ratio of oil to water is determined by experiment57% :43%,emulgator 2%、stabilizer0.4%、modifier4%。
1.3、mineral aggregate:mechanism sand,meet the ES-2 type slurry sealer mixture gradation requirements。
1.4、water:local drink water 
After raw materials be testing, and can be used after meet the requirements of the standard。
2. Mix design
The optimum amount of asphalt used in the slurry compounding mix should be 7.9%,mineral aggregate(4#):water:emulsified asphalt =1:0.07:0.14,means 1000g mineral aggregate(4#):69.4g water:138.6g emulsified asphalt。
3. Main construction technology and technical measures
Before the formal construction of the slurry seal layer, a comprehensive inspection of the grass-roots level, horizontal slope and flatness of the test section can be carried out. The indexes of the grass-roots level meet the requirements of the specification before the construction of the slurry layer.
4. Construction of Slurry Seal
   4.1 be ready for down layer:
 a、Detection of the quality of the asphalt sponge, the acceptance, and clean。
 b、Lofting:
c、The number of lanes is divided according to the width of the spreader and the single width and the slurry cover paver, and the control line for guiding the paver is drawn.
   4.2 Construction machinery needed:
1.Stores reserve
1.1、asphalt:70#A level asphalt。
1.2、emulsified asphalt:PCR cationic、ratio of oil to water is determined by experiment57% :43%,emulgator 2%、stabilizer0.4%、modifier4%。
1.3、mineral aggregate:mechanism sand,meet the ES-2 type slurry sealer mixture gradation requirements。
1.4、water:local drink water 
After raw materials be testing, and can be used after meet the requirements of the standard。
2. Mix design
The optimum amount of asphalt used in the slurry compounding mix should be 7.9%,mineral aggregate(4#):water:emulsified asphalt =1:0.07:0.14,means 1000g mineral aggregate(4#):69.4g water:138.6g emulsified asphalt。
3. Main construction technology and technical measures
Before the formal construction of the slurry seal layer, a comprehensive inspection of the grass-roots level, horizontal slope and flatness of the test section can be carried out. The indexes of the grass-roots level meet the requirements of the specification before the construction of the slurry layer.
Equipment Exhibition
road slurry seal construction equipment
4. Construction of Slurry Seal
   4.1 be ready for down layer:
 a、Detection of the quality of the asphalt sponge, the acceptance, and clean。
 b、Lofting:
c、The number of lanes is divided according to the width of the spreader and the single width and the slurry cover paver, and the control line for guiding the paver is drawn.
   4.2 Construction machinery needed:

Item name

Spec

Qty

Slurry sealer

DAW10-K43

1unit

Watering cart

8T

3unit

Load vehicle

20T

2unit

Roller

DAYL-D12O

2unit

4.3、Paving construction:

a、Before paving should control the aggregate, filler, water emulsion with the ratio. During paving, if material used up, you must immediately stop paving, re-loading and then continue. The slurry mixture formed by the agitation meets the designed amount of asphalt and gradation requirements and has good workability.

     b、During paving,install the slurry sealer with the material into the paving starting point, adjust the paving slot, open the control switch, so that the adjustment of the slurry into the paving slot, when the flow to 2/3 slot, start the chassis, Forward, and always keep the paved slot has a certain amount of slurry, when the first car after the paving, the next car paving should be re-stacked on a car shop 5-10cm.

5、Requirements of paving technical :

Paving the thickness of the uniform (15px); vertical and horizontal joints smooth; paving the surface smooth without pit hole marks; slurry mixture to achieve a certain degree of consistency, not partial and dry.

6、Forming maintenance:

6.1.After the slurry seal is formed, the curing time depends on the amount of water in the slurry mixture and the amount of cohesive force.

    6.2.Under normal circumstances, 24 hours is needed before opening the traffic.after the slurry cover construction is completed,

7、Sampling and testing

The slurry seal should be sampled at the construction site to check whether the seepage coefficient, thickness and mineral grade are within the specified range. All test results are reported to the supervising engineer for approval.

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