Road structure – process – or apparatus – Pavement – Modules or blocks
Patent
1997-02-07
1999-05-11
Lisehora, James A.
Road structure, process, or apparatus
Pavement
Modules or blocks
249 2, C04B7/02
Patent
active
059020687
ABSTRACT:
Vehicle arresting blocks of cellular concrete are usable to safely slow travel of an object and may be used to construct an aircraft arresting bed at the end of an airport runway. For such purposes, cellular concrete blocks must be fabricated to exhibit compressive gradient strengths of predetermined values to provide sufficient, but not excessive, deceleration forces on an object. Material uniformity characteristics must be met to avoid unacceptable drag force variations, so that arresting blocks desirably exhibit a predetermined compressive gradient strength (e.g., a 60/80 CGS) over a depth of penetration of 10 to 66 percent of block thickness. A 60/80 CGS will typically represent an average compressive strength of 70 pounds per square inch over such depth of penetration. Prior applications of cellular concrete typically involved meeting minimum strength values and the production methods did not meet uniformity or compressive gradient strength predictability as required for arresting blocks. Described methods include parameter, ingredient and process controls and ranges effective to enable fabrication of arresting blocks having dry densities and compressive gradient strengths which can be specified in order to provide limited deceleration of aircraft and other objects. Limited deceleration can avoid destructive effects inherent in excess rates of deceleration. SEQUENCE LISTING (Not Applicable)
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Angley Richard D.
Ciesielski Michael S.
Dial Christopher T.
Mahal Peter T.
Datron Inc.
Lisehora James A.
Robinson Kenneth P.
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