Four different apparatus and techniques were used to measure the viscosities of the various asphalt paving cements over the range 50 to 3 00° F. Each are described briefly. (a) Sliding plate (microfilm) viscometer. This apparatus, which is illustrated in Figure I , facing, was used to measure viscosities

The purpose of this paper is to summarize the results of the first phase of a project to evaluate the effect of CRMs produced by different processes on basic rheological, failure, and aging properties of asphalt binders. The evaluation was done using the new testing and aging procedures developed for the Strategic Highway Research Program.

Project Exploring the Feasibility of Innovative Integration of Place Change Materials for Thermo-Adaptive Asphalt Pavements Team Dr. Jenny Liu, Professor Missouri University of Science & Technology Description asphalt have significant effects on the performance and life span of asphalt concrete (AC) pavements, since asphalt is temperature-sensitive. Different from current extensive efforts

and long-term aging by using different asphalt binders. EXPERIMENT DESIGN The experiment involved 10 asphalt binder types, two short-term aging methods, one long-term aging method, and three testing tem­ peratures. Six of 10 asphalt binder types were unmodified asphalts, and 4 were modified asphalts.

3.1.1. Effects of Different PG Graded Asphalt Binder A full combination experiment was carried out mainly to evaluate the effects of different PG graded asphalt binders on the performance of the HMA (Tables 1 and 2). Table 1: APA Test Results for Full Combination with Keating Coarse and Fine Aggregates HMA Gradation PG 64-28 PG 70-28 PG 76-28

Use a naturally colored aggregate. As the asphalt binder wears way from the surface with traffic, the color of the aggregate is exposed. Use an additive in the asphalt binder. Various iron compounds can impart a red, green, yellow or orange tint to a pavement, while other colors can be achieved using different metal additives.

Assessing Climate Change Impact on Asphalt Binder Grade: Selection and its Implications. 100th Annual Meeting of the Transportation Research Board (TRB) of National Academies of Science and Engineering. Washington DC, USA. Under Review. Swarna S T, Hossain K. (2020). Changes in Asphalt Binder Grade Due to Climate Change in Canada.

Interaction effects of crumb rubber modified asphalt binders. The application of crumb rubber in asphalt mixtures is intended to improve the binder properties by reducing the binder’s inherent temperature susceptibility. This research investigated the interaction effects of CRM binders as a function of various blending treatments in the

Over the past decades, reclaimed asphalt pavement (RAP) materials have been increasingly used in asphalt pavements due to their significant contribution in reducing asphalt production costs and energy consumption. The main drawback associated with using RAP materials is the excessive amount of stiffness which the aged RAP binder introduces to the mixtures, thus

11.1 Hot Mix Asphalt Plants 11.1.1 General1-3,23, 392-394 Hot mix asphalt (HMA) paving materials are a mixture of size-graded, high quality aggregate (which can include reclaimed asphalt pavement [RAP]), and liquid asphalt cement, which is heated and mixed in measured quantities to produce HMA. Aggregate and RAP (if used) constitute over 92 percent

Economic and environmental benefits motivate transportation agencies to increase the amount of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) used in asphalt mixtures. In the U.S., materials cost savings in 2017 totaled approximately $2.2 billion with RAP and RAS materials replacing asphalt binder and aggregate in