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OCR for page 225
Commentary to the Mix Design Manual for Hot Mix Asphalt This Commentary, a companion to the Manual compiled during NCHRP Project 9-33, in- cludes large amounts of supporting technical information and detailed references that, although important, would distract the user's attention from the essential information in the Manual. The information presented herein will also help engineers and researchers in the future to edit, up- date, and refine the Manual. The Commentary is organized in chapters, with each chapter in the Commentary correspon- ding exactly with a chapter in the Manual. Many of the chapters in the Commentary contain only general introductory information that can be found in many different texts and references on construction materials and pavements; in such cases, the chapters are brief and do not list spe- cific technical supporting information. Furthermore, information given in the Manual that is well supported, clearly referenced, or both, is generally not included in the Commentary. Tech- nical information in the Commentary has been presented as concisely as possible, its primary purpose being to provide a record for those wishing to thoroughly evaluate and revise the Man- ual in the future. It is not necessary to read the Commentary in order to understand or use the information in the Manual. The Commentary is intended for researchers and engineers seeking a deeper understanding of some of the more complex technical underpinnings of the Manual. 225