56 Result(s)

Article

The Microstructure of Cement Aggregate Interfaces

Mortar bars of tricalcium silicate or ordinary portland cement with small aggregate particles have been sectioned and examined in the transmission electron microscope (TEM). The presence of calcium silicate hy...

X. Zhang, G. W. Groves, S. A. Rodger in MRS Online Proceedings Library (2011)

Chapter and Conference Paper

²⁹Si Enrichment and Selective Enrichment for Study of the Hydration of Model Cements and Blended Cements

²⁹Si enrichment has been used to enable acquisition of multiple ²⁹Si MAS and CP-MAS NMR spectra from samples of C₃S hydrating in situ in a MAS NMR probe. Data with excellent signal-to noise ratios were obtained a...

A. R. Brough, I. G. Richardson, G. W. Groves… in Nuclear Magnetic Resonance Spectroscopy of… (1998)

Chapter and Conference Paper

Alkali Activation of Reactive Silicas in Cements: In Situ ²⁹Si MAS NMR Studies of the Kinetics of Silicate Polymerization

In the alkaline environment of concretes, silica can react in two ways. In the pozzolanic reaction, it combines with free lime to generate additional CSH binding phase. Alternatively reaction with alkali (ASR)...

A. R. Brough, I. G. Richardson, C. M. Dobson… in Nuclear Magnetic Resonance Spectroscopy of… (1998)

Article

The microstructure and strength of carbonated aluminous cements

The effect of carbonation on the microstructure and flexural strength of hardened aluminous cement pastes has been investigated. It is found that pastes containing either C3AH*6 or CAH10 as the major crystalli...

B. M Henry, B. A Kilmartin, G. W Groves in Journal of Materials Science (1997)

Article

The structure of the calcium silicate hydrate phases present in hardened pastes of white Portland cement/blast-furnace slag blends

The C-S-H gels present in both water- and alkali-activated hardened pastes of white Portland cement/blast-furnace slag blends have been studied by solid-state ²⁹Si magic angle spinning nuclear magnetic resonance ...

I. G Richardson, G. W Groves in Journal of Materials Science (1997)

Article

Alkali activation of reactive silicas in cements: in situ ²⁹Si MAS NMR studies of the kinetics of silicate polymerization

In the highly alkaline environment of the cement paste of a concrete, a source of silica can potentially react in two ways. In the pozzolanic reaction, it can combine with free lime to generate additional calc...

A. R. Brough, C. M. Dobson, I. G. Richardson, G. W. Groves in Journal of Materials Science (1996)

Article

A study of the pozzolanic reaction by solid-state ²⁹Si nuclear magnetic resonance using selective isotopic enrichment

The hydration of a mixture of tricalcium silicate and silica has been studied by ²⁹Si solid-state nuclear magnetic resonance, using selective enrichment of the reactants with ²⁹Si in order to follow and compare t...

A. R. Brough, C. M. Dobson, I. G. Richardson, G. W. Groves in Journal of Materials Science (1995)

Article

In situ solid-state NMR studies of Ca₃SiO₅: hydration at room temperature and at elevated temperatures using ²⁹Si enrichment

²⁹Si isotopic enrichment was used for acquisition of multiple ²⁹Si magic-angle spinning (MAS) and cross-polarization magic-angle spinning (CPMAS) nuclear magnetic resonance (NMR) spectra, in situ in an NMR probe...

A. R. Brough, C. M. Dobson, I. G. Richardson, G. W. Groves in Journal of Materials Science (1994)

Article

Microstructure and microanalysis of hardened ordinary Portland cement pastes

Hardened ordinary Portland cement pastes of various ages have been examined by analytical transmission electron microscopy (TEM) and electron microprobe analysis (EMPA). The stability of the various hydrate ph...

I. G. Richardson, G. W. Groves in Journal of Materials Science (1993)

Article

Microstructure and microanalysis of hardened cement pastes involving ground granulated blast-furnace slag

The microstructure and composition of hardened cement pastes of a wide range of blends of ground granulated blast-furnace slag with ordinary Portland cement have been studied, using techniques of transmission ...

I. G. Richardson, G. W. Groves in Journal of Materials Science (1992)

Article

The Microstructure of ggbfs/OPC Habdened Cement Pastes and Some Effects of Leaching

Ground granulated blast-furnace slag (ggbfs)/Ordinary Portland cement (OPC) blends are possible materials for use in intermediate and low-level radioactive waste repositories. The microstructural development i...

I. G. Richardson, Sally A. Rodger, G. W. Groves in MRS Online Proceedings Library (1989)

Article

Effect of γ-Radiation on the Microstructure and Microchemistry of ggbfs/OPC Cemet Blends

Ground granulated blast-furnace slag (ggbfs)/OPC blends are among the materials being considered as possible encapsulating matrices for low and intermediate level radioactive wastes. It is therefore desirable ...

I. G. Richardson, G. W. Groves, C. R. Wilding in MRS Online Proceedings Library (1989)

Article

TEM observations of a high alumina cement paste

C. S. Poon, G. W. Groves in Journal of Materials Science Letters (1988)

Article

The microstructure of macrodefect-free cement with different polymer contents and the effect on water stability

The effect of different polymer contents on the microstructure of ordinary Portland cementbased macrodefect-free cement was studied by high voltage transmission electron microscopy. The microstructure, especia...

C. S. Poon, G. W. Groves in Journal of Materials Science (1988)

Article

Electron Microscopical Studies of Tricalcium Silicate - Fly Ash Blended Pastes

Fly ash (FA) is becoming a common addition to ordinary portland cement (OPC) both in Europe and in the USA. Although a great deal of work has been carried out to characterize fly ashes from different sources, ...

S. A. Rodger, G. W. Groves in MRS Online Proceedings Library (1987)

Article

The effect of latex on macrodefect-free cement

The effect of adding latex to macrodefect-free cement was studied. The porosity of the modified pastes was smaller than the normal macrodefect system but the pore size was not significantly changed. The tradit...

C. S. Poon, G. W. Groves in Journal of Materials Science (1987)

Article

Time-dependent mechanical properties of high-strength cements

A high-strength cement paste based on aluminous cement with the addition of water-soluble polymer was found to have a flexural strength which increased at about 12 MPa per decade increase in strain rate over t...

C. M. Cannon, G. W. Groves in Journal of Materials Science (1986)

Article

Time-dependent mechanical properties of high-strength cements

A high-strength cement paste based on aluminous cement with the addition of water-soluble polymer was found to have a flexural strength which increased at about 12 MPa per decade increase in strain rate over t...

C. M. Cannon, G. W. Groves in Journal of Materials Science (1986)

Article

A Study of Tricalcium Silicate Hydration From Very Early to Very Late Stages

The hydration of a tricalcium silicate paste has been examined from very early stages, i.e. during the induction period, up to two and half years using both scanning and transmission electron microscopy as wel...

S. A. Rodger, G. W. Groves, N. J. Clayden, C. M. Dobson in MRS Online Proceedings Library (1986)