Fine Sand for Use in PC Concrete, MLR-88-6, 1989

(1989) Fine Sand for Use in PC Concrete, MLR-88-6, 1989. Transportation, Department of

pdf
Preview
PDF
IADOT_mlr8806_Fine_Sand_Use_PCC_1989.pdf

File Size:684kB

Abstract

In several locations of Iowa, it is becoming more difficult to produce concrete sand consistently at a reasonable cost. Both ASTM and AASHTO have specifications for concrete sands that allow a finer, poorer graded sand than Iowa specifications. The objective of the study was to develop standard mix designs to permit the use of finer graded sand for PC concrete. Three hundred cylinders were made from five sands available in the state. Based on the results of the study, the following are recommended: (1) Create another class of concrete sand by: (a) lowering the current mortar strength ratio from 1.5 to 1.3, (b) raising the allowance for the percent passing one sieve and retained on the next from 40 to 45, and (c) including a provision that 25 to 60 percent passing the number 30 sieve is required for the sand; and (2) Modify the standard paving mixes with and without fly ash for use with the finer sand as follows: (a) 8% more cement and fly ash for B-2 to B-5 mixes, (b) 7% more cement and fly ash for A-2 to A-5 mixes, and (c) 5% more cement and fly ash for C-2 to C-5 mixes and water reduced mixes.

Item Type: Departmental Report
Keywords: Cost effectiveness, Mix design, Portland cement concrete, Recommendations, Sand, Specifications
Subjects: Transportation > Pavements
Transportation > Pavements > Concrete
Transportation
Transportation > Materials
Transportation > Roads and highways
Transportation > Research
ID Code: 17377
Deposited By: Iowa DOT Library
Deposited On: 07 Jul 2014 17:05
Last Modified: 11 Feb 2015 20:55
URI: http://publications.iowa.gov/id/eprint/17377