A model for two types of calcium silicate hydrate in the microstructure of Portland cement pastes

By P. Tennis, H. Jennings. 2000

662 citations recorded by the source corpus.

A new physical basis for a previously published model for the structure of calcium silicate hydrate (C-S-H) as measured by nitrogen sorption is described. This refined model provides a method of predicting the density, the nitrogen accessible gel porosity, and associated surface area of C-S-H in Portland cement pastes. The basis for the model is that C-S-H forms as one of two types, high- or low-density C-S-H. This provides a promising tool for characterizing the microstructure in a way that can be applied to understanding properties of engineering significance.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6516e2a7cbad7852a1303e12f1a865a4b50563d2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Civil and Structural Engineering

In Materials Chemistry

Citations in the corpus

Diffusivity of saturated ordinary Portland cement-based materials: A critical review of experimental and analytical modelling approaches (2016, methodology): “For the models of Liu et al. [125] and Stora et al. [123], we specifically consider porosities of LD C-S-H and HD C-S-H as 0.37 and 0.24, respectively, which are based on the colloidmodel of C-S-H proposed by Jennings [25].”
Micromechanical investigation of Portland cement paste (2014, methodology): “The mass ratio of outer product C–S–H to the total C–S–H in a dried condition can be quantitatively evaluated by a simple model proposed by Tennis and Jennings [41]:”
Effects of nano-TiO2 on strength, shrinkage and microstructure of alkali activated slag pastes (2015, background): “Literature data [8,11–14] indicate that pore size distribution and characteristics of hydration products are the critical factors affecting the shrinkage in OPC and AASP.”
Advances in characterizing and understanding the microstructure of cementitious materials (2019, background): “Similarly, time-resolved SANS [248] and nitrogen adsorption isotherms [249] separately capture the formation of two morphologies with different surface areas.”
Nanogranular packing of C–S–H at substochiometric conditions (2010, background): “[15–19] who recognized that outer and inner products are two structurally distinct but compositionally similar C–S–H phases; that is, amorphous nanoparticles of some 5 nm characteristic size pack into two characteristic forms, a Low-Density (LD) C–S–H phase and a High-Density (HD) C–S–H phase, that ”
Modeling the linear elastic properties of Portland cement paste (2005, neutral): “H present in cement paste [37].”
The nanogranular nature of C–S–H (2007, methodology): “H mass ratio relation proposed by Tennis and Jennings (2000): Mr ¼ mLD mCSH ¼ 3:017w c x 1:347xþ 0:538 (19) ARTICLE IN PRESS G. Constantinides, F.-J. Ulm / J. Mech.”
Experimental and modelling research of the accelerated calcium leaching of cement paste in ammonium nitrate solution (2013, background): “Initial porosity and porosity evolution Before leaching, the porosity is assumed to be the same at any spatial position x, then the initial capillary porosity /cap(x, 0), the initial gel porosity /gel(x, 0), and the initial total porosity /(x, 0) can be determined using follow equations [31]: /capðx”
Spherical and acicular representation of hydrates in a micromechanical model for cement paste: prediction of early-age elasticity and strength (2009, background): “At a more elaborate stage, they might well be determined from additional homogenization steps, encompassing low-density and high-density C-S-H [11, 17 ,59], which, in turn, are built up by nanometer-sized elementary bricks.”