EGIS Construction

Pavement Preventive Maintenance
BUSINESS

Pavement Preventive Maintenance

Crackk Repair

Asphalt, SBS, Natural Rubber and Silica are added, forming asphalt which is manufactured in adding of oil to give flexibility according to change of atmosphere temperature, it is construction method to maximize adhesion ability using untraviolet ray heating equipment that thermal efficiency can be maximized.

Characteristic of Crack Repair

- Prevent percolation of rain water and sinkage of ground
- Ease contraction and expansion according change of atmosphere temperature
- Excellet adhesion force at low temperature and elastic recovery rate
- Excellent Durability, Quality and Economic Feasibility

Crack Occurance Reason

Asphalt pavement is composed with road upper layer, basic floor, surface layer. Because this design has a little change according to geographical features, structure, weather, traffic volume, deterioration begins by oxidation process of asphalt substance right after construction.
According to this, asphalt substance disappears and aggregate leaves only, pavement itself is easy to be breakdown. elastic power decreases according to load and temperature change by traffic volume, and then crack is proceeded.
In case that crack portion of asphalt pavement is left undone, moisture percolates into crack portion, if the moisture stacks on basic floor and surface layer, it generates speed of asphalt oxidation rapidly and promotes deteriation.
This phenomenon decreases strength of asphalt pavement as well, brings partial sinkage of road upper layer, when it takes load such as vehicle driving, it maximizes crack and crush of pavement layer, because the staying moisture at cract portion freeze and expands in winter time, crack portion is rapidly enlarged, detachment occurs at the portion of basic floor and surface layer, in worst case, it can be the cause of road collapse.

Crack Types

Crack by temperature change (Temperature Shrinkage Crack)
Asphalt pavement road occurs contraction by volumetric decrease from evaporation, condensation, outflow of oil substance and oxidation and then crack is proceeded. In case of teperature drop and asphalt hardning, asphlat plane pressure generates crack in longitudinal and transverse, transverse crack begins first in case of wide road. Logitudinal crack is in-line crack, it is occurred that horizontal pressure can not spread uniformly, this logitudinal crack is occured at the joint portion of pavement construction.

Crack by pavement's fatigue (Fatige Crack)
Crack is occured by vertical pressure and basic floor change according to vehicle driving. Crack according to fatigue appears in shape of block generally. This cause results from aspjalt sustance of surface layer and weak ground of road upper layer, basic floor. Also, it is called edge crack to be occured phenomenon according to fatigue of road pavement.

Reflective Crack
When it is overlay pavement on convetion pavement road without repair of crack, crack is occurred on overlay layer by shear force from wheel load of pavement layer upper portion. It occurs interactional crack or reflection crack on ovelay pavement.

Crack Repair Construction Cases

Airport Runway - Before Construction
Park Lot - Before Construction
Local Road - Before Construction

Airport Runway - After Construction
Park Lot - After Construction
Local Road - After Construction

Road Shoulder Masonry Joint Filling

It is construction method to fill elastic seal material at facing portion between concrete pavement main road and road shoulder masonry joint, prevent ground sinkage, prevent image degrade by weed growth, protect safety of driver.

Road Shoulder Masonry Joint Filling Characteristics

- Excellent Heat Resistance and Mobility Resistance with adding of Special high molecular forming asphalt
- No need high temperature heating because heating temperature is 190℃~210℃
- High elastic recovery rate and excellent adhesion ability
- Preserve elasticity and flexibility in winter time, No destruction of sealing layer according to pavement layer.

Elastic Seal Material Performance for Pavement

Items	Criteria	Result	Judgement	Test method
Cone Penetration (25℃)	Under 90	56.4	OK	ASTM D 5329
Elasticity Recovery Rate(25℃) (Original State Recovery Rate)	Over 60	62.5	OK
Flow Degree(60℃) (Flow Anility)	Under 3.0	1.49	OK
Asphalt Suitability(60℃) (Asphalt Compatible)	All serene	All serene	OK
Adhesivity(-29℃, 50%)	All serene	All serene	OK
Softning Point(℃)	Over 80℃	90.5	OK	ASTM D 36

Road Shoulder Masonry Joint Filling Construction Cases

Before Construction
Before Construction
Before Construction

After Construction
After Construction
After Construction

PPM Construction Method (Preventive Maintenance)

Preventive maintenance is a way to maintain conventional road economically, it's a construction method to prevent performance deteriation preserving public usage of roas before deteriation of conventional function due to severe breakdown of convetional road.

Preventive Maintenance Charateristic

- Increase adhesive force of aggregate due to percolationn of protection material into pavement body after 4 days of protection material coating
- Effect of pavement coating & minute crack filling
- Easy percolation into minute crack, increase waterproof function
- Capable to fill without additional treatment for crack of 3~5mm
- Capable to reduce usage volume of snow removal material with suppression of moisture percolation
- Preserve same texture as new construction road in balck color
- Increase asopahlt durability and prolong life cycle
- Open traffic within 1 hour
- In case of bridge, Prolong pavement life of pavement and structure with waterproof effect increasement
- In case of small breakdown and crack repair, Capable to decrease and increase according to repair volume
- Cost is surface treatment is about 15% level of convetional cutting overlay cost.

General Repair (Conventional Structural Repair) VS Preventive Maintenance

General Repair (Conventional Structural Repair)
- [Purpose] Pqvement breakdown or breakdown area repair
Preventive Maintenance
- [Purpose] Preserve pavement and decrease quality deteriation of pavement
  Prior to the occurrence of severe damage to public roads, Prevent damage of pavement with application of low price pre-maintenance repair method, enhance public usage life and maintain a high level of commonality.