Jose C Trujillo

US Patent:

43045049, Dec 8, 1981

Filed:

Feb 21, 1980

Appl. No.:

6/123205

Inventors:

Jose A. Trujillo - Albuquerque NM

Assignee:

Riguez Associates - Albuquerque NM

International Classification:

E01C 1918

US Classification:

404108

Abstract:

An improvement to a laydown machine comprising an unsegregator shroud connected to the ejector chute of the aggregate elevator transporter. The shroud extends around the chute to constrain the path of aggregates as they are fed into the feed box of the paving machine.

US Patent:

43838642, May 17, 1983

Filed:

Sep 19, 1980

Appl. No.:

6/188814

Inventors:

Jose A. Trujillo - Albuquerque NM

Assignee:

Riguez Associates - Albuquerque NM

International Classification:

C08L 9500

US Classification:

106281R

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.

US Patent:

43571697, Nov 2, 1982

Filed:

Feb 21, 1980

Appl. No.:

6/123207

Inventors:

Jose A. Trujillo - Albuquerque NM

Assignee:

Riguez Associates - Albuquerque NM

International Classification:

C08L 9500

US Classification:

106281R

Abstract:

A uniform asphalt pavement of substantial area composed of aggregates of varying natural qualities produced by a systematic process including mix design, mix analysis, and plant control methods. A volumetric comparison is mathematically made between blendings of coarse and fine aggregates defined over a single sieve size and a Riguez Index to determine voidage in the compacted aggregate mixture. The Riguez Index is characteristic to the particular fine aggregates used in the blending. For controlling voidage at the mixing plant, the respective quantities of coarse and fine aggregates injected into the mixing plant is controlled over the same single sieve size used for demarcating coarse and fine aggregates in mathematically computing the volumetric comparison. Further, a stability function derived from different combinations of crushed fine and blend sand, and a flexibility function derived from different mix quantities of asphalt cement provide control of flexibility and stability values.