Document Archives

Volume 2, Effect of Aggregate Type and Admixtures [on block mix design] [of 5 volumes]

• ID:

  306

• ESCSI:

  3640.060

• Author:

  Amiri, Babrak

• Publication Name:

  Lightweight High Performance Concrete Masonry Units

• Type of Publication:

  Book

• Publisher:

  University of Nebraska, Lincoln

• Dated:

  1992

• Issue/Volume:

  December

• Other ID:

• Page(s):

  1-90

• Reference List:

  Y

• Abstract:

  The constituent in the concrete block mix that has the most effect on the weight of a unit is aggregate. In the past few decades different kinds of artificial lightweight aggregates have been produced. Examples are expanded clay, expanded shale, and expanded slate. Using these types of aggregates in concrete blocks can reduce the weight of an 8″x8″x16″ hollow concrete block to approximately 17 lbs. Low density blocks are cheaper to transport, increase mason’s productivity, and can result in lower dead loads of the building. Until recently the strength of a block with lightweight aggregate has been lower than that of a normal weight aggregate block.
  Current technology using silica fume, fly ash, and well graded aggregate, has enabled the production of concretes with compressive strength of up to 25,000 psi and improved durability.