Research Brief: Evolving the C-S-H Packing Density at the Microscale
Name
CSHub_ResearchBrief_EvolvingCSH_FINAL.pdf
Size
3.04 MB
Format
Adobe PDF
Checksum (MD5)
05728577cf72d443d3cca537067c9265
Author(s)
Petersen, Thomas
Ulm, Franz-Josef
Date Issued
October 2, 2017
Series/Report no.
CSHub Research Brief;Vol 7, 2017
Abstract
Cement paste is a complex multiphase material, roughly 50 percent of which, by volume, is composed of calcium-silicate-hydrates (C-S-H). The C-S-H phase, which lends the material its rigidity, appears to be a dispersion of nanometer-sized particles that densify during the course of the hydration reaction (Ioannidou et al., PNAS 2016). Because the mechanical properties, early-age internal stresses, and microstructure are critically dependent on the distribution of the high density (HD) and low density (LD) C-S-H product, research efforts are underway to better understand nanoparticle packing density at the scale of hundreds of micrometers, where a binary mixture of clinker grains and saturated pore space evolve into a porous hydrated gel. This research brief displays simulated snapshots of cement paste at varying hydration degrees and predicts the evolution of the HD and LD peaks for the distribution of the indentation modulus also observed in nanoindentation experiments.
Description
One page research brief
Subjects
C-S-H
Cement
Cement Hydration
Terms of Use
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