Magnetic resonance imaging of 1H, 23Na, and 35Cl penetration in Portland cement mortar

Cano, Francesc; Bremner, T. W.; McGregor, R.P; Balcom, Bruce J.

doi:10.1016/s0008-8846(02)00747-0

Cited by 33 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…, obtained by Fourier transformation of S(k j ) given by Eq. (8). The simulation parameters were T 1 /TR = 0.01; P p/2 = 50 ls; a = p/ 2, p/3, p/6; (a, a 0 , a 0 0 ) W max = 1000 kHz; (b, b 0 , b 0 0 ) W max = 250 kHz; (c, c 0 , c 00 ) W max = 100 kHz; (d, d 0 , d 00 ) W max = 10 kHz.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

35Cl profiling using centric scan SPRITE with variable flip angle excitation

Romanenko

Cano-Barrita

Balcom

2009

Journal of Magnetic Resonance

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

“…Limited 35 Cl MRI studies are available in the literature. To the best of our knowledge, the only two studies employ earlier generations of SPRITE methods [8,9].…”

Section: Introductionmentioning

confidence: 99%

35Cl profiling using centric scan SPRITE with variable flip angle excitation

Romanenko

Cano-Barrita

Balcom

2009

Journal of Magnetic Resonance

View full text Add to dashboard Cite

“…17 Freeze/thaw effects have also been studied, 18 as has ion penetration. 19 However, since the image is acquired without slice selection and by points rather than line scanning, it gives poorer spatial resolution and takes much longer to acquire an image (hours rather than minutes); 3-D images have not yet been acquired by these techniques and even 2-D images can only be obtained with difficulty.…”

Section: Mr Principlesmentioning

confidence: 99%

The use of MRI to observe the structure of concrete

Marfisi

Burgoyne

Amin

et al. 2005

Magazine of Concrete Research

View full text Add to dashboard Cite

A range of magnetic resonance imaging (MRI) measurements of water in concrete samples and their constituent materials is described and it is demonstrated that MRI can be used to (1) discriminate the spatial distribution of aggregates within a fresh sample, (2) measure changes in water content during the hardening process of cement, and (3) detect fractures and voids within a water-saturated sample. The requirements of the magnetic resonance technique that the sample be free of iron impurities necessitated an investigation of a range of materials for manufacturing suitable concrete samples. This led to a mix design which is representative of normal concretes yet MRI compatible. MRI can achieve image acquisition using a number of different protocols which are defined and optimised according to the equipment available, the properties of the sample and the particular type of image required. Suitable protocols for detecting the water in concrete are described. Magnetic resonance (MR) images of the internal structure of concrete are presented, which allow the aggregate, sand and matrix to be distinguished as well as any voids that are present. It is shown from our experiments that the measurable water present in wet concrete is in two forms, and the amount and proportions of these two components alters during hardening, which allows the progress of the associated chemical reaction to be studied. It is shown that fractures can be detected, but it is concluded that rather than attempting to determine both the structure and the fracture state from a single MRI image, it is far better to measure two separate images, one optimised to show the structure and the second for delineating the fractures. Concrete behaviourConcrete is a conglomerate made by mixing aggregates, sand, cement and water in suitable proportions. The resulting composite material is often described by its strength and stiffness, but these are the overall and averaged properties of a notional heterogeneous material and are not sufficient to describe local variations and

show abstract

“…Indeed, interactions involving chlorides may retard their rate of penetration and thus provide some measure of long-term protection [32]. Several studies have been reported in the literature investigating the penetration of NaCl into porous building materials such as calcium silicate bricks [33] and OPC [30]. The current study aimed to explore the potential of the CW-NMRI technique in the study of salt water penetration into such materials.…”

Section: Imaging Of Salt Penetration Into Cementmentioning

confidence: 99%

Development of a 3-D, multi-nuclear continuous wave NMR imaging system

Fagan

Davies

Hutchison

et al. 2005

Journal of Magnetic Resonance

View full text Add to dashboard Cite

The development of a 3-D, multi-nuclear continuous wave NMR imaging (CW-NMRI) system is described and its imaging capability is demonstrated on a range of materials exhibiting extremely short T 2 relaxation values. A variety of radiofrequency resonators were constructed and incorporated into a new gradient and field offset coil assembly, while the overall system design was modified to minimise microphonic noise which was present in an earlier prototype system. The chemically combined 27 Al in a high temperature refractory cement was imaged, and the CW-NMRI system was found to be sensitive to small differences in 27 Al content in these samples.

show abstract

Magnetic resonance imaging of 1H, 23Na, and 35Cl penetration in Portland cement mortar

Cited by 33 publications

References 6 publications

35Cl profiling using centric scan SPRITE with variable flip angle excitation

35Cl profiling using centric scan SPRITE with variable flip angle excitation

The use of MRI to observe the structure of concrete

Development of a 3-D, multi-nuclear continuous wave NMR imaging system

Contact Info

Product

Resources

About