摘要:

The adsorption of asphalt functionalities and asphalt oxidized to different degrees on real and model aggregates has been investigated. The functionalities used were: nitrogen-base, phenolic, carboxylic acid, ester, ketone, sulfoxide, and polynuclear aromatic. Adsorption isotherms of these functionalities on porous silica showed different affinity rankings dependent upon concentration. The competitive affinity ranking of the asphalt functionalities on dried silica was obtained as phenylsulfoxide > qulnoline > phenol > benzoic acid > benzophenone > benzylbenzoate > pyrene. The sensitivity to moist silica surface of the four most strongly adsorbed compounds was: qulnoline > benzoic acid > phenol > phenylsulfoxide.

ISSN:0884-3759    

DOI:10.1080/08843758908962289

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A model for the participation of asphalt cement in a pavement is suggested. In this model, polar entities in the asphalt interact with the aggregate surface; nonpolar materials in the asphalt matrix will then structure via coulombic forces, van der Waals and hydrogen bonding. A mechanism by which this structuring could lead to transverse cracking is also suggested.

ISSN:0884-3759    

DOI:10.1080/08843758908962290

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Roadway asphalt has been characterized by13C NMR and reasonable chemical shift assignments made. An initial analysis of the asphalt samples from the refinery liquid, plant mix. Initial and 18 month cores has been made; however, these roadways have not aged sufficiently to develop correlations with performance.

ISSN:0884-3759    

DOI:10.1080/08843758908962291

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

It is widely known that asphalts yielding similar results in standard tests like penetration may in fact exhibit significantly different performance with respect to product manufacturing, application, or durability. Thus, a need exists for more definitive testing, especially with respect to defining the chemical composition of asphalt. Direct spectroscopic analysis of asphalt is difficult because of its compositional complexity, high degree of association between compounds present, and high, overall average molecular weight/boiling range. Hence, prior liquid chromatographic separation into compound classes or types can greatly enhance the level of information obtainable from spectroscopic methods, as well as provide information on types and quantities of compounds present. The scheme discussed involves initial separation into acid, base, and neutral types using development of routine test methods to significantly higher levels of sophistication than those currently available.

ISSN:0884-3759    

DOI:10.1080/08843758908962292

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0884-3759    

DOI:10.1080/08843758908962288

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor