Final construction outcomes of Emulsified Asphalt Liquid are closely associated with on‑site environments. Favorable surroundings support stable emulsification reactions and demulsification‑curing processes, while harsh conditions directly bring about pavement defects and material waste. Therefore, site temperature, weather, ground conditions and ventilation should all be carefully checked prior to construction to match application characteristics of Emulsified Asphalt Liquid. Ambient temperature represents the core factor influencing construction quality. Emulsification, demulsification, bonding and curing of Emulsified Asphalt Liquid rely on appropriate thermal conditions. Within the optimal temperature range of 10℃‑35℃, product activity reaches its peak, demulsification proceeds uniformly and favorable bonding‑forming results are achieved.
When ambient temperature falls below 10℃, molecular activity of Emulsified Asphalt Liquid decreases significantly, demulsification and curing slow down greatly. Newly laid pavements fail to solidify for a long time, readily catching dust and foreign particles, which later leads to pavement loosening and insufficient bonding strength. Freezing and stratification of the emulsion may also occur under low temperatures, rendering materials completely unusable. If ambient temperature exceeds 35℃, after Emulsified Asphalt Liquid is sprayed or brushed, water evaporates too rapidly, giving rise to instant demulsification and uneven local drying. This brings inconsistent coating thickness on pavements and poor adhesion, followed by cracking and peeling in later service periods.
Next, construction shall be avoided under adverse meteorological conditions. Do not carry out construction on rainy days or before pavements dry thoroughly after rainfall. Standing water on pavements dilutes Emulsified Asphalt Liquid concentration and damages emulsion systems, preventing asphalt from bonding with base layers and causing rapid peeling after construction. Operations are not recommended under gale conditions at wind‑force level 5 or above. Strong winds blow away sprayed or brushed Emulsified Asphalt Liquid, wasting raw materials, and carry large quantities of sand dust onto uncured pavement surfaces to form interlayers and undermine pavement integrity. Construction should also be halted in heavy fog and frost, for excessive moisture retards curing and degrades forming quality.
Furthermore, job‑site ground conditions must meet standards. Working surfaces should remain clean, dry and level, free of sludge, oil contamination, gravel debris and floating dust. Oil stains separate Emulsified Asphalt Liquid from base courses and reduce bonding capacity, while foreign objects result in uneven surfaces, hollowing and cracking after pavement formation. Surrounding construction zones should be neat to prevent secondary contamination of working surfaces by debris and flying dust. Adequate ventilation shall be maintained at construction locations; natural outdoor ventilation suffices. Never conduct construction in basements or narrow closed spaces, where volatile substances from the emulsion accumulate and interfere with manual operations and hinder coating drying and solidification.
Besides, construction shall be kept away from extreme surroundings, such as intensely sun‑scorched stuffy sites without shelters and low‑lying cold‑humid zones with poor air circulation. Check on‑site conditions ahead of construction, clear debris and standing water on working surfaces, and arrange construction schedules according to weather forecasts. Prioritize construction in mild spring and autumn periods. Avoid midday high‑heat hours in summer and choose warm noon time for winter operations. All these measures secure good forming performance of Emulsified Asphalt Liquid and help keep various pavement‑quality problems at bay.
