Burns from Hot Bitumen During Spray Sealing
HighSpray sealing uses bitumen at 180-185°C applied under pressure through spray bars. Equipment failures including hose ruptures, valve failures, or spray bar component breakage can discharge hot bitumen onto workers. Blockages in spray equipment can cause pressure surges when cleared. Wind can blow bitumen spray onto workers near distributor truck. Unlike asphalt which cools during handling, spray bitumen remains at application temperature throughout process. Contact with hot bitumen causes severe burns with material adhering to skin continuing thermal damage.
Consequence: Third-degree burns requiring skin grafts and lengthy hospitalization, permanent scarring and disfigurement, infection risks during healing, chronic pain conditions, fatality if extensive burns occur to large body surface areas.
Vehicle Impact from Live Traffic
HighRoad base and sealing operations progress along roadways at slow speeds (5-10 km/h) with workers walking alongside or behind equipment. Traffic management controls approaching vehicles but driver inattention, speeding, or impairment creates breach risks. Fresh seal surfaces are extremely slippery until aggregate embedded, vehicles entering work zone can lose control sliding into equipment or workers. Multiple pieces of equipment working in linear progression creates collision risks between equipment and with ground workers.
Consequence: Fatal impact injuries from vehicle strikes at highway speeds, multiple trauma injuries, equipment damage from collisions, psychological trauma from serious incidents.
Silica Dust from Base Materials
MediumRoad base materials containing crystalline silica generate respirable dust during spreading, grading, and compaction operations particularly in dry conditions. Graders and dozers operating in dusty conditions create visibility hazards and expose operators to dust infiltrating equipment cabins. Ground workers near equipment operations inhale dust. Prolonged exposure to respirable crystalline silica causes silicosis and increases lung cancer risk. Current workplace exposure standard is 0.05 mg/m³ TWA.
Consequence: Silicosis developing over years of exposure with no cure once established, chronic obstructive pulmonary disease, lung cancer from prolonged exposure, reduced lung function affecting work capacity.
Slips and Falls on Wet Base or Fresh Seal
MediumBase material moisture conditioning creates slippery walking surfaces. Fresh prime coat is oily and slippery. Newly sealed surfaces are extremely slippery until aggregate embedment occurs, with bitumen acting as lubricant under vehicle or foot traffic. Workers must walk on these surfaces to hand-spread aggregate at edges, check coverage, and inspect seal quality. Falls onto rough aggregate surfaces cause abrasions and impact injuries. Plant operators dismounting equipment onto slippery surfaces risk falls.
Consequence: Fractures from falls particularly to wrists, arms, and hips, soft tissue injuries and contusions, abrasions and cuts from rough aggregate surfaces, head injuries if falls from equipment occur.
Heat Stress During Summer Operations
MediumRoad construction work occurs predominantly outdoors with workers exposed to direct sun, radiant heat from hot bitumen and fresh seal surfaces, and physical exertion from manual tasks. Roller operators in enclosed cabins experience high thermal load if air conditioning inadequate. Bitumen distributor operators work near heated bitumen tanks. Full PPE required for burn protection reduces evaporative cooling. Projects often schedule during summer months for optimal bitumen working temperatures, coinciding with peak heat conditions.
Consequence: Heat exhaustion causing weakness, nausea, and collapse, heat stroke requiring hospitalization with potential organ damage, dehydration affecting cognitive function and increasing other incident risks.
