Rate of thixotropic rebuilding of cement pastes modified with highly purified attapulgite clays
By S. Kawashima, M. Chaouche, D. Corr, Surendra P. Shah. 2013
140 citations recorded by the source corpus.
Abstract This study investigates the influence of highly purified, nano-sized attapulgite clays on the rate of structural rebuilding of cement pastes. A shear rheological protocol is implemented that measures the rate of rebuilding of pastes after being broken down under shear and maintained under stress corresponding to the weight of the material. This simulates a real casting situation during which the concrete is initially in motion, then cast in place and measures how quickly it gains green strength immediately after placement. The rate of recovery for different resting times and preshear conditions are considered. The strain rate decay curves are fitted with a compressed exponential model to obtain relaxation time. The results show that the purified attapulgite clays significantly accelerate rate of recovery of pastes, especially at early ages. However, this accelerating effect diminishes at longer resting times as hydration mechanisms begin to dominate.
Subfields: Building and Construction, Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/6b98ec2bfd098838588703a22c5940c0d83f09a3
How researchers see this paper
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In Building and Construction
- Daniel G. Soltan
- Ye Qian
- S. Kawashima
- Victor C. Li
- M. Şahmaran
- R. Ranade
- Christopher K. Y. Leung
- J. Sanjayan
In Civil and Structural Engineering
Citations in the corpus
- A self-reinforced cementitious composite for building-scale 3D printing (2018, methodology): “Remaining portion of the water content is mixed with the ANC and used for the ANC exfoliation process, similar to that described in Kawashima (2013), in a standard 40 oz./700W blender [24,25].”
- Use of creep recovery protocol to measure static yield stress and structural rebuilding of fresh cement pastes (2016, methodology): “Studies by Kawashima [26] showed that after 30 min of resting, storage modulus of cement pastes without nanoclay becomes higher than those with 0.”