The tank should be designed with an appropriate circulation system to ensure that there is a constant movement of binder over the flues during heating. In the event of having to superheat the binder above 180°C it is essential that tanks are fitted with augers or stirrers to prevent localized overheating. Store the binder at the minimum pumping temperature and not at the application temperature. The binder should only be heated to the application temperature just prior to use to limit degradation of the polymer. Do not the binder to solidify in the storage tank as reheating will result in localised overheating around the flues. Rather heat the binder intermittently over an extended period to maintain a constant storage temperature. Avoid rapid heating of the binder. As a rule of thumb the rate of heating should not exceed 15°C per hour unless the tank is fitted with an agitation mechanism. All tanks are to be fitted with calibrated temperature gauges. In the case of a sprayer a temperature gauge should be fitted on the spray bar as well as the tank to ensure that the binder is sprayed at the correct application temperature. All established modified binder storage facilities should strive to install temperature recording devices with automatic temperature controls for heating. Obtain a method statement from the supplier on the correct handling and storage temperatures for the modified binder. To what extent are emulsions used in sealing? Is there a push to use emulsions based on environmental reasons? Emulsions are use in various forms in the construction of seals. They are used mainly: For priming granular and crushed bases In the construction of spray seals in winter especially Cape Seals In slurries for texture treatments, rutfilling and slurry for constructing Cape seals For dilute covers sprays on newly constructed spray seals to prevent early stone loss For rejuvenator and enrichment sprays for aged seals What lab test method and limits are used to measure the storage stability and degradation of PMB’s?
The tank should be designed with an appropriate circulation system to ensure that there is a constant movement of binder over the flues during heating. In the event of having to superheat the binder above 180°C it is essential that tanks are fitted with augers or stirrers to prevent localized overheating. Store the binder at the minimum pumping temperature and not at the application temperature. The binder should only be heated to the application temperature just prior to use to limit degradation of the polymer. Do not the binder to solidify in the storage tank as reheating will result in localised overheating around the flues. Rather heat the binder intermittently over an extended period to maintain a constant storage temperature. Avoid rapid heating of the binder. As a rule of thumb the rate of heating should not exceed 15°C per hour unless the tank is fitted with an agitation mechanism. All tanks are to be fitted with calibrated temperature gauges. In the case of a sprayer a temperature gauge should be fitted on the spray bar as well as the tank to ensure that the binder is sprayed at the correct application temperature. All established modified binder storage facilities should strive to install temperature recording devices with automatic temperature controls for heating. Obtain a method statement from the supplier on the correct handling and storage temperatures for the modified binder. To what extent are emulsions used in sealing? Is there a push to use emulsions based on environmental reasons? Emulsions are use in various forms in the construction of seals. They are used mainly: For priming granular and crushed bases In the construction of spray seals in winter especially Cape Seals In slurries for texture treatments, rutfilling and slurry for constructing Cape seals For dilute covers sprays on newly constructed spray seals to prevent early stone loss For rejuvenator and enrichment sprays for aged seals What lab test method and limits are used to measure the storage stability and degradation of PMB’s?