The American Concrete Pavement Association (ACPA) has released five new applications for iPhone and iPad mobile devices:

    Area and Volume Calculator - quickly calculates plan area and volume of material based on a pavement or subbase/subgrade layer's thickness, width, and length.

    Concrete Mixture Proportioner - provides a method of proportioning a concrete mixture using the absolute volume method in substantial conformance with ACI 211.1-91, "Standard Practice for Selecting Proportions for Normal, Heavyweight and Mass Concrete."

    Maximum Joint Space Calculator - calculates joint spacing in jointed plain (unreinforced) concrete pavement.

    Staking Interval Calculator - calculates the rate of change of a vertical curve and, based on this value, provides maximum staking interval recommendations.

    Subgrade Resilient Modulus Calculator - using conversion factors included in National Cooperative Highway Research Program Report 128,

"Evaluation of American Association of State Highway and Transportation Officials Interim Guide for the Design of Pavement Structures," this app allows users to quickly estimate the Subgrade Resilient Modulus from either a California Bearing Ration (or Resistance Value measurement.

The applications are available at Apple's iTunes App Store for a nominal fee. The association's online app library meets a growing demand for Web- and mobile device-based information; iPhone/iPad resources include powerful design- and construction-related tools, Web versions of ACPA software, and general interest applications. See http://apps.acpa.org/ for more details.