TY - JOUR
T1 - Use of bench-top NMR to measure the density, composition and desorption isotherm of C-S-H in cement paste
AU - Muller, A. C.A.
AU - Scrivener, K. L.
AU - Gajewicz, A. M.
AU - McDonald, P. J.
N1 - Funding Information:
We thank Y.-Q. Song (Schlumberger-Doll Research) for 2D-FLI software. Funding was provided by the European Union (FP7/2007-2013 grant 264448 ), the UK EPSRC (grant EP/H033343/1 ) and Nanocem.
PY - 2013/9/15
Y1 - 2013/9/15
N2 - 1H nuclear magnetic resonance (NMR), supported by a measurement of the degree of hydration using X-ray diffraction, has been used to fully characterise the nano-scale porosity and composition of calcium-silicate-hydrate (C-S-H), the active component of cement. The resultant "solid" density and composition are ρ = 2:68 g=cm3; (Ca)1.53. (Si0.96,Al0.04)O3.51. (H2O) 1.92 for an underwater cured, never-dried cement paste with an initial mix water-to-cement ratio of 0.4 after 28 days of hydration. In addition, the first pore-type resolved desorption isotherm of cement that shows the location of water as a function of relative humidity has been measured. Critical to our results is verification of the assignment of the different NMR spin-spin relaxation time components. These have been corroborated with conventional analyses. The new methodology is key to enabling design of cement pastes with lower environmental impact.
AB - 1H nuclear magnetic resonance (NMR), supported by a measurement of the degree of hydration using X-ray diffraction, has been used to fully characterise the nano-scale porosity and composition of calcium-silicate-hydrate (C-S-H), the active component of cement. The resultant "solid" density and composition are ρ = 2:68 g=cm3; (Ca)1.53. (Si0.96,Al0.04)O3.51. (H2O) 1.92 for an underwater cured, never-dried cement paste with an initial mix water-to-cement ratio of 0.4 after 28 days of hydration. In addition, the first pore-type resolved desorption isotherm of cement that shows the location of water as a function of relative humidity has been measured. Critical to our results is verification of the assignment of the different NMR spin-spin relaxation time components. These have been corroborated with conventional analyses. The new methodology is key to enabling design of cement pastes with lower environmental impact.
KW - Calcium silicate hydrate
KW - Density
KW - Desorption isotherm
KW - Nuclear magnetic resonance
KW - Pore size distribution
UR - http://www.scopus.com/inward/record.url?scp=84894900240&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2013.01.032
DO - 10.1016/j.micromeso.2013.01.032
M3 - Article
AN - SCOPUS:84894900240
SN - 1387-1811
VL - 178
SP - 99
EP - 103
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -