blank space

South Dakota Department of Transportation
Project Synopsis
SD1991-13


Title: Investigation of Bridge Deck Hot Weather Concreting
Project Researcher: ,
Project Manager:
Research Period: -
Status:
Cost: $0.00

Problem Statement:Although many problems may exist during hot weather concreting only two are identified here.
  1. Contractors have trouble consistently meeting our current maximum concrete temperature specifications while still being able to achieve a construction schedule which they feel is adequate. High concrete temperatures may result in slump and air loss, decreased strength, and decreased durability.

  2. A high rate of evaporation can be caused by any combination of the following: high ambient temperature, high concrete temperature, high winds, and/or low humidity. Finishing problems and plastic shrinkage cracking are frequently associated with hot weather concreting and may develop whenever the rate of evaporation is greater than the rate at which water rises to the surface of the recently placed concrete.



Findings:

Research Objectives:
1  Determine whether ACI Committee 305 recommended guidelines are being violated.
2  Determine whether SDDOT specifications, as they apply to bridge deck placement, need to be changed.

Research Tasks:
1  Review any available literature, concentrating on documents prepared by highway related agencies.
2  Collect data during bridge deck placement for the following: (a.) Rate of evaporation. (b.) Finishing and curing conditions. (c.) Rate of pour. (d.) Measures taken to control temperature of mix components. (e.) Average time from batchi
3  Contact other states with hot summer weather to determine: (a.) What specifications they implement for hot weather concreting. (b.) If their specifications were based on research, what research was done. (c.) What problems they have encounte
4  Prepare an expected work plan for the 1991 construction season and submit it with the first quarterly report by March 15, 1991.
5  Prepare reports describing the research methodology, findings, conclusions, and recommendations.

Documents Available:
blank space