Chapter 4. Working with Silica-Fume Concrete Conducting a Test Placement Transporting, Placing,...
-
Upload
marian-ilene-boyd -
Category
Documents
-
view
227 -
download
3
Transcript of Chapter 4. Working with Silica-Fume Concrete Conducting a Test Placement Transporting, Placing,...
Chapter 4. Working with Silica-Fume Concrete
Conducting a Test Placement Transporting, Placing, and Consolidating
Finishing Flatwork Finishing Bridge Decks
Preventing Plastic-Shrinkage Cracking Curing
Remember:Silica-fume concrete is more cohesive and less
prone to segregation
To improve workability, increase slump by about
2 in. (50 mm)
What is Plastic Shrinkage Cracking?
Cracking that occurs in the surface of fresh concrete soon after it is placed and while it is still plastic.
-- ACI 116R
“If silica-fume concrete mixtures are given 7 days of continuous moist
curing, then there is no association between silica fume content and
cracking.”
-- Whiting and Detwiler NCHRP Report 410
“It is recommended that a minimum of 7 days continuous moist curing be
specified.”
-- Whiting and Detwiler NCHRP Report 410