Publication details
Risk of improper aggregates application in asphaltic concrete preperation. Edit.:Cardu-Ciccu-Lovera-Michelottl: Mine planning and equipment selection
| Title in English | Risk of improper aggregates application in asphaltic concrete preperation. |
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| Authors | |
| Year of publication | 2006 |
| Type | Monograph |
| MU Faculty or unit | |
| Citation | |
| Description | The paper is focused on risk elimination related with application of improper basalt aggregates in asphaltic concrete production and application. Properties of asphaltic concrete closely relate to mineral composition of an aggregate, in studied case alkali basalts. They are discussed the results of microstructure study of aggregates, mineral associations, crystallization time sequence and mutual relations between individual minerals. The complex study has proved negative impact of alkali basalts secondary minerals and essential role of zeolites in the process of big pores and cavern formation in the watertight dense graded asphalt concrete layer. The initial reaction between minerals as chemical reagents of aggregate and asphalt starts already during the primary production of asphaltic concrete mixture. The releasing of water molecules from zeolite structure leads to formation of primary micro-pores. The water included in micro-pores and micro-cracks between aggregates and matrix during the winter times periodically freezes and increases its volume. They are formed first bigger pores and cracks spreading inward the layer. The process of water pumping in plant is periodically (every day) repeated so pores are exposed to temperature variations and continual water addition. |
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