Product Introduction

The anti-cracking paste is also known as anti-cracking paste, polymer stress absorbing film and stress absorbing paste. The reinforced fiber material with good flexural performance, high tensile strength and permanent corrosion resistance is selected as the base material, and the upper and lower layers are covered with high-performance viscoelastic materials processed by special matching. Anti-cracking paste is made of asphalt-based polymer, high-strength tensile tire base, high temperature resistance and high-strength fabric compatible with asphalt. The product has self-adhesive, convenient construction, directly paste cracks. This structure is an organic comprehensive application of several measures to prevent cracks on expressways, and is also an upgraded product of crack prevention and waterproofing on white to black highways.

When the cement concrete crack deformation, due to the "crack" base material tensile strength is greater than the bonding strength, so that the original concentration of stress, through the crack cover has been dispersed, to prevent and reduce the possibility of cracks in asphalt concrete. When the adjacent cement concrete plate is repeatedly cut up and down within a certain range, the reinforced fiber has excellent flexural resistance and extensibility. Therefore, it is not easy to break the "anti-cracking paste", keep the "anti-cracking paste" with good self-adhesive sealing, cut off the surface water erosion cement concrete plate expansion joints (cracks), ensure the stability of the foundation, reduce the factors of cracks.

 

Main features

◎ Excellent anti-cracking effect

2mm thickness of the "crack". When the horizontal displacement of the two cement concrete plates is 1mm (the width of the base joint is 4mm), the anti-cracking paste can play a good role in relieving and dispersing. After opening and closing for 10000 times, the "anti-crack patch" has no damage.

◎ has excellent low temperature flexibility, good resistance to shear performance

Because the "anti-crack paste" substrate is soft and elastic. The bending 1800 material does not break. When the "anti-crack paste" pasted on two cement concrete plates is displaced 0.5mm (the width of the base joint is 4mm) up and down, after repeated up and down displacement 10000 times, the "anti-crack paste" has good flexibility and elongation, and the "anti-crack paste" is not damaged (the allowable upper and lower displacement value in regular design is generally not more than 0.06mm).

◎Good bonding performance

"Anti crack paste" and cement concrete base and asphalt concrete surface layer at the same time has a good bonding force, the bonding strength is greater than 4N/mm, the hot asphalt concrete rolling, the bonding performance is greatly improved, so when the level of force, not easy to produce slip and damage.

◎ good waterproof sealing

Since the self-adhesive covering layer on the lower surface of the "anti-cracking paste" is greater than 1mm, it is completely combined with cement concrete after being rolled by hot asphalt concrete, which greatly improves the waterproof and tightness, prevents surface water from penetrating into cracks in cement concrete plates, and improves the stability of the foundation. Especially when subjected to the horizontal thrust of the running vehicle, due to its good self-adhesive and soft covering, to ensure the waterproof sealing.

◎ Convenient construction

The application method of "anti-cracking paste" is self-adhesive cold construction. As long as the isolation paper (membrane) is removed, it can be directly pasted on the treated cement concrete base. Construction is convenient and fast. At the same time, it does not pollute the environment and is an environmentally friendly product.

◎ Physical properties

The base seam tape is a kind of active waterproof material with high strength, high elongation and high adhesion. The net thickness is more than 2mm, which can effectively improve the crack resistance and waterproof performance of the pavement. Geotextile is a kind of unidirectional permeable or impermeable fiber fabric suitable for earthwork. Generally, the thickness is very thin, less than 1mm, and the tensile strength, elongation and elasticity are also low. It is not suitable for use as a basic waterproof material.

◎ Chemical properties

The base layer is composed of a variety of polymer materials, stable chemical properties, excellent anti-aging performance, better than the chemical properties of geotextile.

◎ Paste performance

The grass-roots seam with itself has a strong bonding ability, can be directly bonded with the clean grass-roots, and geotextile itself does not have the bonding ability, need to brush emulsified asphalt to have a certain bonding ability. And the sealing effect of the bonding is also poor.

◎Large elasticity and strong anti-deformation ability

The grass-roots seam with "self-healing" ability and strong anti-deformation ability, in the grass-roots cracks up and down the dislocation will not appear fracture or tear phenomenon. And geotextile basic inelastic and deformation ability, in the occurrence of grass-roots dislocation is easy to produce fracture in the cracks and lose the role.

 

anti-cracking mechanism

The "anti-cracking paste" uses reinforced fiber materials with good flexural performance, high tensile strength and permanent corrosion resistance as the base material, and is covered with high-performance viscoelastic materials processed by special ratio. The anti-cracking mechanism is as follows:

◎ When the cement concrete crack deformation, due to the "crack" substrate tensile strength is greater than the bonding strength, so that the original concentration of stress, through the anti-crack coating has been dispersed, to prevent and reduce the possibility of cracks in asphalt concrete.

◎ When the adjacent cement concrete plate, in a certain range of domestic up and down repeated shear, due to the use of reinforced fiber has excellent flexural resistance and extensibility. Therefore, it is not easy to break the "anti-cracking paste", and the original stress diffusion function of the "anti-cracking paste" is maintained.

◎ Because the "anti-cracking paste" has a good self-adhesive sealing, cut off the surface water erosion cement concrete plate expansion joints (cracks), to ensure that the foundation is stable, reduce the factors of cracks.

 

Main causes of pavement cracks

◎ When the pavement is subjected to the repeated impact of the driving vehicle load, especially under the action of overload, the adjacent plates of the cement concrete pavement frequently move up and down, and the corresponding parts of the asphalt concrete deformation stress concentration, resulting in cracking of the asphalt concrete pavement layer.

◎ When the surface water erosion to the cement concrete expansion joints (including cracks), so that the part of the roadbed soft, increased the cement concrete plate, under the displacement, prompting the asphalt concrete pavement layer cracking.

◎ The change of temperature difference causes the cement concrete plate to expand with heat and shrink with cold, causing the horizontal displacement of the plate. Because the asphalt concrete is directly spread on the cement concrete plate, its change law and shape variable are synchronized with the cement concrete plate, causing the asphalt concrete pavement to crack.

 

Selection of width of anti-cracking paste

◎ For transverse joints and cement concrete slab surface cracks less than 10mm, use anti-cracking stickers with a width of> 30cm, and for transverse joints and longitudinal joints greater than 10mm, use anti-cracking stickers with a width of 50mm.

◎ Glass fiber grid should be selected with a width of 100cm and a tensile strength of 2000N/100cm.

 

Self-adhesive anti-cracking paste construction guide

1. Basic Requirements for Cement Concrete Pavement

(1), cement concrete plate must be stable. When the deflection value and the height difference between adjacent sides exceed the design requirements, the subgrade shall be reinforced.

(2), cement concrete pavement of various gaps (including expansion joints, construction joints, plate fracture cracks, etc.), shall be filled with flexible materials, filling height and pavement level.

(3) The broken and loose cement concrete shall be removed, and the defective parts shall be repaired and leveled. Asphalt concrete or quick-drying cement concrete can be used as the repair material.

(4), cement concrete plate surface requirements flat, clean, dry (water content is not more than 10%), not sand.

2. base course cleaner

Before paving the "anti-cracking paste", the special treatment (cleaning) agent for the base surface should be painted on the cleaned base surface. Construction can be used roller brush or brush, the amount of 0.2-0.3kg per square meter. The purpose is to consolidate the residual dust on the base surface and improve the bonding effect of the "anti-cracking paste. After the special treatment (cleaning) agent for the base surface dries (subject to non-sticky hands, generally 0.5-1 hour), the "anti-cracking paste" can be applied ".

3. paving "anti-cracking paste"

With the expansion joint (crack) as the center line, according to the width required by the design, select the "anti-crack paste" to unfold it and discharge it at the part to be cracked, with the isolation paper facing downward, then lift the "anti-crack paste" in half, tear off the lower isolation paper and lay it forward, so that the "anti-crack paste" is laid flat on the base surface in situ, and then construct the other half of the "anti-crack paste" anti-crack paste "according to the above method".

After the 4. "anti-cracking paste" is laid, flatten the "anti-cracking paste" with a sand bag or pressure roller.

When two pieces of "anti-cracking stickers" overlap in the 5., the width should be 8-10cm. The lap joint shall be compacted with pressure roller to make it firmly bonded.

 

Construction considerations

(1) The cement concrete pavement must be dry before construction. The base surface shall not be constructed in wet, rainy and snowy days.

(2) After construction, the "anti-cracking paste" must be compacted with sand bag or rubber tire roller to prevent rainwater from entering the "anti-cracking paste" bonding surface before paving asphalt concrete. If heavy rain is expected before the asphalt concrete is to be spread, it shall be sealed with sealant on both sides of the "anti-cracking patch.

(3), when the temperature is lower than 5 ℃, it is not suitable for construction.

(4) When paving asphalt concrete, the vehicle shall not be rolled and turned around on the spot on the "anti-cracking sticker.

(5) When the slope is greater than 5%, the width of "anti-cracking paste" should not be greater than 330mm. When paving the underlying asphalt concrete, a small amount of slippage may occur, which should be repaired in time without affecting the quality of the project.

(6) The total thickness of paving asphalt concrete shall not be less than 6cm.

(7) When the height difference of the adjacent side is greater than 1cm or there are many potholes, the part shall be leveled before paving to prevent the "anti-cracking paste" laid on the depression from being damaged by gravity. Leveling material can be leveled with epoxy mortar or asphalt mixture.

 

Construction recommend Scheme of Self-adhesive Anti-cracking Paste

Cement concrete pavement

◎ Anti-cracking paste

◎ underlying asphalt concrete

◎ Glass fiber grille

◎ Surface asphalt concrete

◎ Expansion joint sealing filler

For transverse joints and cement concrete slab surface cracks less than 10mm, anti-cracking stickers with a width> 30cm shall be used.

For transverse and longitudinal joints larger than 10mm, use anti-cracking stickers 50cm wide.

Glass fiber grid should be selected 100mm wide tensile strength 2000N/100cm.

 

Product specifications and performance parameters

Performance/Specification		1.215	1.225	1.515	1.525	2.015	2.025
Thickness (mm)		1.2±0.12	1.2±0.12	1.5±0.15	1.5±0.15	2.0±0.2	2.0±0.2
Tensile strength (KN/m)	Vertical	15	25	15	25	15	25
	Transverse	15	25	15	25	15	25
Elongation at break (%)	Vertical	≤ 3	≥ 20	≤ 3	≥ 20	≤ 3	≥ 20
	Transverse	≤ 3	≥ 20	≤ 3	≥ 20	≤ 3	≥ 20
Low temperature flexibility	(-10 ℃)	No crack	No crack	No crack	No crack	No crack	No crack
Softening point of protective layer (℃)		No water seepage	No water seepage	No water seepage	No water seepage	No water seepage	No water seepage
High temperature resistance	Protective film (130 ℃)		No obvious shrinkage		No obvious shrinkage		No obvious shrinkage
	Reinforcement layer (130 ℃)		No obvious expansion and contraction		No obvious expansion and contraction		No obvious expansion and contraction
Temperature: 20 ℃ Humidity: 50 ℃

 

performance index
Project		Technical Requirements
Tensile properties	Maximum pulling force (N/50MM)	≥ 1400
	Elongation at maximum tension (%)	1.0-10.0
thermal aging	Maximum tensile force retention rate (%)	≥ 70.0
	Retention rate of elongation at maximum tension (%)	≥ 75.0
	Mass loss rate (%)	±2.0
	Dimensional change rate (%)	±2.0
Low temperature flexibility	-10℃	No crack
	-20 ℃ (if necessary)	No crack
	-30 ℃ (if necessary)	No crack
impervious to water	30MIN,0.3MPA	No crack