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Effect of LiAl-layered double hydroxides on hydration of calcium sulfoaluminate cement at low temperature
Highlights LiAl-LDHs was prepared using modified separate nucleation and aging step method. Pastes with and without LiAl-LDHs were prepared and cured at temperature −10 °C. Setting times of pastes with 1.5 % LiAl-LDHs is shortened to half of plain one. Most hydrations in paste with 1 % LiAl-LDHs complete before 1 day. Modified paste achieves 5.5 times compressive strength of plain one at 1 day.
Abstract To reveal the effect of LiAl-layered double hydroxides (LiAl-LDHs) on hydration of calcium sulfoaluminate cement at low temperature, pastes with and without it were prepared and cured at temperature −10 °C. Setting times and compressive strength of pastes were measured. Mercury intrusion porosimetry (MIP) was used to reveal the evolution of pastes microstructure. X-ray diffraction (XRD), Thermogravimetric analysis (TG) and 27Al nuclear magnetic resonance (NMR) were adopted to qualify and quantify the hydration productions. The results show that, LiAl-LDHs is an effective hydration accelerator of CSA cement at low temperature. Initial and final setting times are reduced linearly with the increase of LiAl-LDHs content. However, peak of compressive strength emerges at the content of 1.0%. At this content, modified paste achieves 5.5 times compressive strength of plain one at 1 day and 1.4 times at 28 days. In presence of LiAl-LDHs, more ettringite crystallizes in modified pastes up to 28 days. Denser pastes obtained thereby.
Effect of LiAl-layered double hydroxides on hydration of calcium sulfoaluminate cement at low temperature
Highlights LiAl-LDHs was prepared using modified separate nucleation and aging step method. Pastes with and without LiAl-LDHs were prepared and cured at temperature −10 °C. Setting times of pastes with 1.5 % LiAl-LDHs is shortened to half of plain one. Most hydrations in paste with 1 % LiAl-LDHs complete before 1 day. Modified paste achieves 5.5 times compressive strength of plain one at 1 day.
Abstract To reveal the effect of LiAl-layered double hydroxides (LiAl-LDHs) on hydration of calcium sulfoaluminate cement at low temperature, pastes with and without it were prepared and cured at temperature −10 °C. Setting times and compressive strength of pastes were measured. Mercury intrusion porosimetry (MIP) was used to reveal the evolution of pastes microstructure. X-ray diffraction (XRD), Thermogravimetric analysis (TG) and 27Al nuclear magnetic resonance (NMR) were adopted to qualify and quantify the hydration productions. The results show that, LiAl-LDHs is an effective hydration accelerator of CSA cement at low temperature. Initial and final setting times are reduced linearly with the increase of LiAl-LDHs content. However, peak of compressive strength emerges at the content of 1.0%. At this content, modified paste achieves 5.5 times compressive strength of plain one at 1 day and 1.4 times at 28 days. In presence of LiAl-LDHs, more ettringite crystallizes in modified pastes up to 28 days. Denser pastes obtained thereby.
Effect of LiAl-layered double hydroxides on hydration of calcium sulfoaluminate cement at low temperature
Zou, Dinghua (author) / Wang, Ke (author) / Li, Haiyan (author) / Guan, Xuemao (author)
Construction and Building Materials ; 223 ; 910-917
2019-07-20
8 pages
Article (Journal)
Electronic Resource
English
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