[Black Technology for Highways] Can "cloth" build roads? --Polyester fiberglass cloth

[Black Technology for Highways] Can "cloth" build roads? --Polyester fiberglass cloth

Recently, some places reported that the material used in the maintenance and repair of a certain section of the road turned out to be "cloth", which sounds strange to many people. In fact, for our road maintenance industry, we have heard of this material more or less: polyester Fiberglass cloth.

Let's first come to the first site to learn about the construction of polyester fiberglass cloth.

At the construction site of the large and medium-sized repairs in the Changxing section of Provincial Highway 301, Lao Zheng, the person in charge of the construction unit, carefully touched a piece of "textile cloth" in front of him, "Hey, it's really a bit thorny and itchy. Everyone, be careful, Remember to wear rubber gloves when handling.”

The workers around were talking about this roll of "textile cloth"

"I have been working on the road for nearly 20 years, and I have never seen a road construction cloth!"

Textile?

For road repair? !

What kind of black technology is that!

look down~

That's right! This "textile cloth" is a new material just introduced by Changxing Highway——

TP non-reinforced polyester fiberglass cloth

TP non-reinforced polyester fiberglass cloth

The new polyester fiberglass composite material is specially designed and produced to solve pavement cracks and waterproofing. The stress-dispersed waterproof layer structure formed by combining with asphalt is a reliable solution to prevent reflective cracks on the pavement and water damage to the base layer.

Overall, the advantages of this cloth are

1 high temperature resistance

2 can be crushed and recycled

3 Extend the life of the road

4 Reduce maintenance costs

can be used in

1 Treatment of cracks in major and medium repair projects of asphalt pavement

2 "White to black" cement pavement is covered as an asphalt surface

3. Disposal of longitudinal joints in reconstruction and expansion roads

4 Treatment of semi-rigid base shrinkage joints

5 Bridge deck waterproofing...etc

Polyester fiberglass cloth is so good, so what are the specific requirements and processes for materials and construction?

one

Polyester fiberglass cloth material requirements

The quality standard of polyester fiberglass cloth is shown in Table 1. The supplier must submit a factory inspection report (imported products also need a commodity inspection report), and can enter the site after the quality approval. The construction unit should keep it properly to prevent moisture, pollution or damage. 

In order to improve the bonding effect, the bonding material adopts SBS modified asphalt, and its quality should meet the requirements of the corresponding technical indicators.

two

Construction Equipment and Appliance Requirements

The construction equipment mainly includes: hot asphalt spraying vehicle (with heating device, the nozzle is professionally processed, the spraying must be misty, and the spraying amount can be controlled), polyester glass fiber cloth laying equipment (using polyester glass fiber cloth laying equipment for construction , to ensure that the polyester fiberglass cloth is straight and wrinkle-free after laying).

Construction equipment mainly includes: blower, iron roller, brush, etc. (to remove floating soil and broken ballast, and to compact and stick polyester glass fiber cloth on the binder).

three

Construction technology and method

The construction process of polyester fiberglass cloth is as follows: working surface cleaning → lofting, marking → spraying binder → laying polyester fiberglass cloth → maintenance → asphalt mixture paving → open traffic.

(1) Work surface cleaning:

①For the road sections that do not need milling, observe the cracks. For the cracks with incomplete sealing seams and no sealing seams, the seams need to be sealed according to the requirements;

②For the milling section, observe the condition of the bottom layer after milling, and if it is confirmed that there is a crack, seal the seam first;

③ Before spraying the adhesive, the original road should be cleaned and kept flat and dry.

(2) Staking and marking:

① On the bottom surface that has been accepted by the supervision engineer, determine the location of the seam or crack;

② For transverse cracks, the cloth width is 1.0m; for longitudinal seams or longitudinal cracks, the cloth width is 1.2m. And it must be ensured that the width of the cloth on both sides of the crack is ≥0.5m, and the seam or crack is centered.

(3) Spray hot SBS modified asphalt binder:

①The heating temperature of SBS modified asphalt in the distribution vehicle should be kept at about 175~185℃. The position of spraying the thermal adhesive material is accurate, and the lateral range is 5-10cm wider than that of the polyester glass fiber cloth;

②When spraying the thermal adhesive, the construction temperature should be above 10℃; the spraying is uniform and the measurement is accurate. The dosage is generally 0.8~1.2kg/㎡. .

(4) Laying and overlapping of polyester fiberglass cloth:

①After the adhesive is spread, trim it evenly as soon as possible, and immediately carry out the laying construction of polyester fiberglass cloth;

② After the laying equipment is in place, straighten the polyester fiberglass cloth on the bracket so that the polyester fiberglass cloth reel is perpendicular to the seam or crack. When using a tractor or a frame mounted on a truck to lay the polyester fiberglass cloth, the speed of the vehicle should be kept uniform, and it should not be fast or slow, and it should be adjusted manually in time to achieve the purpose of smooth laying. The paving is equipped with iron rollers, so that the paved polyester fiberglass cloth can be compacted and bonded to the asphalt binder in time;

③ During the laying process, a special person shall be set up on site to check and deal with wrinkles or discounts;

④ During paving construction, it should be paved in a straight line as much as possible; when it is necessary to turn, cut the curved part of the polyester fiberglass cloth, lay it overlappingly, and spray the adhesive layer to glue it;

⑤ The overlapping width of the longitudinal seam of the polyester fiberglass cloth is 5-10cm, the horizontal seam is 10-15cm, and the distance between the seam and the crack on the road surface should be ≥0.5m. The overlapping direction of the transverse joint should be the direction of paving the asphalt concrete, the rear end should be pressed under the front end, and the joint should be firmly bonded with hot asphalt. The lap width should not be too wide;

⑥ During the laying construction, the on-site operators should wear protective gloves to avoid being stabbed by the polyester fiberglass cloth;

⑦ After laying, the exposed hot asphalt is sprayed on both sides of the glass fiber cloth and covered with stone chips.

(5) Maintenance:

①After the polyester fiberglass cloth is laid, pedestrians or vehicles should be prohibited from entering before the thermal adhesive is cooled to room temperature; if it is necessary to open the traffic immediately, an appropriate amount of machine-made sand should be thrown in time, and the upper asphalt mixture should be paved in polyester The glass fiber cloth construction shall be carried out after 24 hours;

② It is forbidden for any vehicle to brake suddenly or make sharp turns when driving on the polyester fiberglass cloth.

(6) Asphalt mixture paving and open traffic:

①Before laying the mixture, the lower layer must be checked and cleaned. The paving temperature during normal construction is 160℃; when the temperature is below 10℃, construction is not allowed;

②The asphalt mixture pavement paved on the same day should be opened for traffic only when the paving layer is naturally cooled to below 50℃ or the same as the surrounding ground temperature.