Adaptive mix proportioning method for use in asphaltic concrete

Compositions: coating or plastic – Coating or plastic compositions – Bituminous material or tarry residue

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427138, C08L 9500

Patent

active

043838642

ABSTRACT:
During production of asphaltic concrete mixtures, the mix controls of a mixing plant are periodically adjusted to proportion fine aggregate, coarse aggregate, and asphalt cement in accordance with a new Riguez Index test thereby to produce pavement materials which when compacted contains a predetermined, controlled and substantially constant volume of air voids and/or percent voids filled (film thickness). The Riguez Index test is a volumetric analysis method which can quickly, i.e., within an hour, be performed in that it mathematically correlates the variations in the physical properties of the aggregated with the desired voidage to be attained in the compacted mixture. Under the test, both mix design and proportioning at the plant site are performed over a single sieve size, the No. 4 sieve being preferred. The aggregate properties which might change during production are absorption, specific gravity, size distribution, particle shape, and consolidation under Marshall compaction, usually resulting from source variations in the rock quarry from which the aggregates are excavated, or from degradation or segregation of aggregates during handling. Therefore, the new mix proportioning method permits the use of indigenous local aggregates having unstable properties even when segregation and degradation occurs, and yet still enables the production of an asphalt pavement having controlled voidage. It is only necessary that the aggregates meet hardness and soundness standards.

REFERENCES:
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patent: 4221603 (1980-09-01), Trujillo
Goode et al., Proceeding of the Association of Asphalt Paving Technologist, Jan. 31, 1962, pp. 197-199.

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