Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alkali-silica reaction products and cracks: X-ray micro-tomography-based
  analysis of their spatial-temporal evolution at a mesoscale   In this study, we propose a laboratory-scale methodology, based on X-ray
micro-tomography and caesium (Cs) as a contrast agent, to advance the
understanding of cracking due to alkali-silica reaction (ASR) in concrete. The
methodology allows achieving a completely non-destructive and time-lapse
characterization of the spatial-temporal patterns of both the cracks and the
ASR products. While Cs addition slightly accelerated the ASR kinetics, the
crack pat-terns, with and without Cs addition, were statistically equivalent.
Cracks with ASR products appeared first in the aggregates, close to the
interface with the cement paste. They propagated afterwards towards the
aggregates interior. Some products were then extruded for several mm into air
voids and cracks in the cement paste. This process suggests that, in the early
stage, the ASR products may be a low-viscosity gel that can flow away from the
source aggregate and may settle later elsewhere as a rigid phase, upon calcium
uptake.

32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph