Volume 3, Issue 1

    Using a Centrifuge to Determine Moisture Properties of Lightweight Fine Aggregate for Use in Internal Curing

    (Received 21 October 2013; accepted 16 January 2014)

    Published Online: 2014

    CODEN: ACEMOAD

      Format Pages Price  
    PDF 17 $25   ADD TO CART


    Abstract

    Internally cured (IC) concrete is frequently produced using pre-wetted lightweight aggregate (LWA). One important aspect associated with preparing quality IC concrete is being able to determine the absorbed moisture and surface moisture associated with the LWA which enables aggregate moisture corrections to be made for the concrete mixture. ASTM 1761-13b specifies the use of the “paper towel method” to define a surface dry state for pre-wetted LWA; however, this can be time consuming and hard to perform at the batching plant. This paper proposes an alternative method for obtaining a surface dry state of the aggregate based on spinning the pre-wetted LWA in a centrifuge. It is shown that using a centrifuge (with bowl radius of 11.4 cm) for 3 min at 2000 rpm permits a surface dry state to be obtained consistently which enables surface and absorbed moisture to be determined accurately and rapidly. The moisture values obtained using the centrifuge correspond well with those obtained using the paper towel method.


    Author Information:

    Miller, A. E.
    Graduate Research Assistant, School of Civil Engineering, Purdue Univ., West Lafayette, IN

    Barrett, T. J.
    Graduate Research Assistant, School of Civil Engineering, Purdue Univ., West Lafayette, IN

    Zander, A. R.
    Concrete Engineer, Indiana Department of Transportation, Office of Materials Management, Indianapolis, IN

    Weiss, W. J.
    Jack and Kay Hockema Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN


    Stock #: ACEM20130111

    ISSN: 2165-3984

    DOI: 10.1520/ACEM20130111

    ASTM International is a member of CrossRef.

    Author
    Title Using a Centrifuge to Determine Moisture Properties of Lightweight Fine Aggregate for Use in Internal Curing
    Symposium , 0000-00-00
    Committee C09