The nanomechanical properties of non-crosslinked calcium aluminosilicate hydrate: The influences of tetrahedral Al and curing age
The nanomechanical properties of non-crosslinked calcium aluminosilicate hydrate: The influences of tetrahedral Al and curing age
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非交联硅铝酸钙水合物的纳米力学性能：四面体Al和养护龄期的影响
DOI：
10.1016/j.cemconres.2022.106900
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发表时间：
2022
影响因子：
11.4
通讯作者：
Huthwelker, Thomas
中科院分区：
文献类型：
--
作者：
Li, Jiaqi;Zhang, Wenxin;Sanz-Camacho, Paula;Duttine, Mathieu;Gardner, David;Carraro, Carlo;Maboudian, Roya;Huthwelker, Thomas
水化铝硅酸钙（C-A-S-H）是水泥基材料和碱激发材料的粘结相。非交联C-A-S-H的固有机械性能是重要的，但未经实验验证。在这里，首次使用高压X射线衍射测量这些特性。利用核磁共振和X射线吸收光谱研究了C-A-S-Hs的不可压缩性和体积模量K 0与其纳米结构和稳定性之间的关系。固化546天的稳定C-A-S-H（Al/Si = 0.1）中的Al配位为纯四面体（AlIV），而固化182天的亚稳C-A-S-H（Al/Si = 0.05）中的Al配位为AlIV和五面体（AlV）。相对于C-S-H，稳定的C-A-S-H沿着a、B、c轴更硬，具有更高的K 0。短时间固化诱导的亚稳C-A-S-H（Al/Si = 0.05）显示出中间层的膨胀和c轴的软化，从而比C-S-H和稳定的C-A-S-H具有更低的K 0。我们的研究结果突出了Al IV掺入的硬化效应和不充分固化对非交联C-A-S-H在Ca/Si = 1时的纳米力学性能的负面影响。
Calcium aluminosilicate hydrate (C-A-S-H) is the binding phase of both blended cement-based and alkali-activated materials. The intrinsic mechanical properties of non-cross-linked C-A-S-H are important while experimentally unvalidated. Here, the properties are for the first time measured using high-pressure X-ray diffraction. The incompressibility and bulk modulus K0of C-A-S-Hs are correlated to their nanostructure and stability using nuclear magnetic resonance and X-ray absorption spectroscopies. Al coordination in stable C-A-S-H (Al/Si = 0.1) cured for 546 days is purely tetrahedral (AlIV), while in metastable C-A-S-H (Al/Si = 0.05) cured for only 182 days is both AlIVand pentahedral (AlV). The stable C-A-S-H is stiffer along the a,b,c-axis with higher K0relative to C-S-H. Short-curing-induced metastable C-A-S-H (Al/Si = 0.05) shows expanded interlayer and softer c-axis, thus lower K0than C-S-H and the stable C-A-S-H. Our results highlight the stiffening effect of AlIVincorporation and the negative influences of insufficient curing on the nanomechanical properties of non-cross-linked C-A-S-H at Ca/Si = 1.
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影响因子：
11.4
作者：
Jiaqi Li;Wenxin Zhang;P. Monteiro
通讯作者：
Jiaqi Li;Wenxin Zhang;P. Monteiro
影响因子：
11.4
作者：
Li, Jiaqi;Zhang, Wenxin;Monteiro, Paulo J. M.
通讯作者：
Monteiro, Paulo J. M.
DOI：
10.1021/acs.jpcc.0c04563
发表时间：
2020-07
期刊：
The Journal of Physical Chemistry C
影响因子：
--
作者：
David W. Gardner;Jiaqi Li;A. Morshedifard;S. Masoumi;M. J. Abdolhosseini Qomi;P. Monteiro;R. Maboudian;C. Carraro
通讯作者：
David W. Gardner;Jiaqi Li;A. Morshedifard;S. Masoumi;M. J. Abdolhosseini Qomi;P. Monteiro;R. Maboudian;C. Carraro
影响因子：
11.4
作者：
Li, Jiaqi;Zhang, Wenxin;Monteiro, Paulo J. M.
通讯作者：
Monteiro, Paulo J. M.
影响因子：
11.4
作者：
Li, Jiaqi;Zhang, Wenxin;Monteiro, Paulo J. M.
通讯作者：
Monteiro, Paulo J. M.