TY  - JOUR
A1  - Kleiner, Florian
A1  - Rößler, Christiane
A1  - Vogt, Franziska
A1  - Osburg, Andrea
A1  - Ludwig, Horst-Michael
T1  - Reconstruction of calcium silicate hydrates using multiple 2D and 3D imaging techniques: Light microscopy, μ-CT, SEM, FIB-nT combined with EDX
JF  - Journal of Microscopy
N2  - This study demonstrates the application and combination of multiple imaging techniques [light microscopy, micro-X-ray computer tomography (μ-CT), scanning electron microscopy (SEM) and focussed ion beam – nano-tomography (FIB-nT)] to the analysis of the microstructure of hydrated alite across multiple scales. However, by comparing findings with mercury intrusion porosimetry (MIP), it becomes obvious that the imaged 3D volumes and 2D images do not sufficiently overlap at certain scales to allow a continuous quantification of the pore size distribution (PSD). This can be overcome by improving the resolution and increasing the measured volume. Furthermore, results show that the fibrous morphology of calcium-silicate-hydrates (C-S-H) phases is preserved during FIB-nT. This is a requirement for characterisation of nano-scale porosity. Finally, it was proven that the combination of FIB-nT with energy-dispersive X-ray spectroscopy (EDX) data facilitates the phase segmentation of a 11 × 11 × 7.7 μm3 volume of hydrated alite.
KW  - Zementklinker
KW  - Bildsegmentierung
KW  - Rasterelektronenmikroskopie
KW  - Computertomographie
KW  - tomography
KW  - focussed ion beam
KW  - cement microstructure
KW  - micro-CT
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20220106-45458
UR  - https://onlinelibrary.wiley.com/doi/10.1111/jmi.13081
VL  - 2021
SP  - 1
EP  - 6
PB  - John Wiley & Sons Ltd
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Le, Ha Thanh
A1  - Nguyen, Sang Thanh
A1  - Ludwig, Horst-Michael
T1  - A Study on High Performance Fine-Grained Concrete Containing Rice Husk Ash
JF  - International Journal of Concrete Structures and Materials
N2  - Rice husk ash (RHA) is classified as a highly reactive pozzolan. It has a very high silica content similar to that of silica fume (SF). Using less-expensive and locally available RHA as a mineral admixture in concrete brings ample benefits to the costs, the technical properties of concrete as well as to the environment. An experimental study of the effect of RHA blending on workability, strength and durability of high performance fine-grained concrete (HPFGC) is presented. The results show that the addition of RHA to HPFGC improved significantly compressive strength, splitting tensile strength and chloride penetration resistance. Interestingly, the ratio of compressive strength to splitting tensile strength of HPFGC was lower than that of ordinary concrete, especially for the concrete made with 20 % RHA. Compressive strength and splitting tensile strength of HPFGC containing RHA was similar and slightly higher, respectively, than for HPFGC containing SF. Chloride penetration resistance of HPFGC containing 10–15 % RHA was comparable with that of HPFGC containing 10 % SF.
KW  - Hochfester Beton
KW  - Verarbeitungseigenschaft
KW  - Druckfestigkeit
KW  - high performance fine-grained concrete, rice husk ash, workability, compressive strength, splitting tensile strength, chloride penetration resistance
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170425-31477
SP  - 301
EP  - 307
ER  -