Cutback Asphalt Grades

Emulsified asphalts are dissolved in water, whereas cutback asphalts are dissolved in a solvent.

1/10 of the middle of the allowable viscosity range

The head portion of an emulsifying agent has an electrostatic charge.

<p>The viscosity of asphalt decreases when the temperature increases.</p> Signup and view all the answers

<p>By conditioning the asphalt to simulate the effects of heating to make asphalt concrete</p> Signup and view all the answers

<p>Fog seal, tack coat, chip seal, and microsurfacing.</p> Signup and view all the answers

<p>The hardness of the residue and the type of solvent used</p> Signup and view all the answers

<p>The evaporation of the solvent from the asphalt residue</p> Signup and view all the answers

<p>60%-70% asphalt cement, 30%-40% water, and a fraction of emulsifying agent.</p> Signup and view all the answers

<p>Breaking or setting.</p> Signup and view all the answers

<p>It determines the AC grade number</p> Signup and view all the answers

<p>The grade numbers are 1/10 of the middle of the allowable viscosity range</p> Signup and view all the answers

<p>The primary distinction between the different grades of cutback asphalts is the kinematic viscosity at 60°C (140°F), with higher grades indicating higher viscosities. They are designated by letters (RC, MC, or SC) representing the type, followed by a number that represents the grade.</p> Signup and view all the answers

<p>The primary factor that determines the setting rate of asphalt emulsions is the rate the emulsion sets (breaks), which is classified into rapid-setting, medium-setting, and slow-setting emulsions.</p> Signup and view all the answers

<p>The purpose of adding solvents to cutback asphalts is to vary the amounts and types of solvent and base asphalt to produce different grades of cutback asphalts, which affects the viscosity of the asphalt.</p> Signup and view all the answers

<p>The Saybolt-Furol viscosity is used to rate the viscosity of asphalt emulsions, which are classified as normal flow or slow flow.</p> Signup and view all the answers

<p>Cationic asphalt emulsions use a cationic emulsifying agent, and are designated by a C preceding the set designation (e.g. CRS), while anionic asphalt emulsions do not have a C preceding the set designation.</p> Signup and view all the answers

<p>The ASTM specifications for cutback asphalts and asphalt emulsions ensure that these products meet certain standards for performance and quality, which is important for ensuring the reliability and durability of pavements. The relevant standards are ASTM D2026, D2027, and D2028 for cutback asphalts, and ASTM D244 for asphalt emulsions.</p> Signup and view all the answers