Tuning the Hydration Acceleration Efficiency of Calcium Carbonate by Pre-Seeding with Calcium Silicate Hydrate.
Tuning the Hydration Acceleration Efficiency of Calcium Carbonate by Pre-Seeding with Calcium Silicate Hydrate.
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通过水合硅酸钙预接种来调节碳酸钙的水化加速效率
DOI：
10.3390/ma15196726
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发表时间：
2022-09-28
期刊：
影响因子：
--
通讯作者：
Ran Q
中科院分区：
文献类型：
--
作者：
Yan H;Zhou D;Yang Y;Shu X;Yu C;Ran Q
纳米材料是胶凝材料精细性能优化的候选材料。近年来，人们对聚合物改善纳米材料的性能进行了大量的研究，但很少有人对无机改性剂对水泥基纳米材料的改性进行评价。在这项研究中，我们探索了通过无机修饰来调整和优化纳米材料的性能。在本工作中，通过晶种表面沉积水化硅酸钙(C-S-H)纳米凝胶来调节碳酸钙(CaCO_3，CC)的水化促进效率。通过控制用量制备了不同表面改性程度的复合碳酸钙-水化硅酸钙(CC-CSH)样品。根据表征，C-S-H在CaCO_3表面的修饰程度存在一个由可用表面空间控制的最大值。一旦可用空间耗尽，过量的C-S-H就会转变为自由形式，导致CC-CSH颗粒之间的粘结。本工作中合成的CC-CSH样品显示出增强的水化加速效率，该效率随C-S-H的实际改性程度而变化。升高的C-S-H修饰导致CC-CSH的加速行为转变为增强的早期加速。通过砂浆强度试验，掺加5%C-S-H改性的CC-CSH表现出最均衡的性能，而C-S-H掺量较高的CC-CSH具有较快的早期强度发展速度，但后期强度较低。高C-S-H改性的CC-CSH试件后期强度较低，可能是由于水化产物的粗化和网络的硬化，以及C-S-H粘结引起的团聚所致。本研究为水泥基纳米材料的性能优化提供了一条新的途径。
Nanomaterials are promising candidates for refined performance optimization of cementitious materials. In recent years, numerous studies about the performance improvement of nanomaterials using polymers have been conducted, but the modification of cement-oriented nanomaterials with inorganic modifiers is seldom assessed. In this study, we explored the performance tuning and optimization of nanomaterials by inorganic modification. In this work, hydration acceleration efficiency of calcium carbonate (CaCO3, CC) was tuned via surface deposition with calcium silicate hydrate (C–S–H) nanogel through seeding. Multiple calcium carbonate–calcium silicate hydrate (CC–CSH) samples with varying degrees of surface modification were prepared via dosage control. According to characterizations, the degree of C–S–H modification on the CaCO3 surface has a maximum that is controlled by available surface space. Once the available space is depleted, excessive C–S–H turns into free form and causes adhesion between CC–CSH particles. The resultant CC–CSH samples in this work showed enhanced hydration acceleration efficiency that is tuned by the actual degree of C–S–H modification. Elevated C–S–H modification causes CC–CSH’s acceleration behavior to shift to enhanced early-age acceleration. According to mortar strength tests, CC–CSH with 5% C–S–H modification showed the most balanced performance, while CC–CSH with higher C–S–H modification showed faster early-age strength development at the cost of lower later-age strength. The inferior later-age strength of highly C–S–H-modified CC–CSH samples may be due to the coarsening of hydration products and stiffening of their network, as well as agglomeration caused by C–S–H adhesion. This study may offer a novel route for performance tuning of cement-oriented nanomaterials.
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影响因子：
3.4
作者：
Kong, Deyu;He, Guangpeng;Sheng, Jiansong
通讯作者：
Sheng, Jiansong
影响因子：
7.4
作者：
Mohseni, Ehsan;Naseri, Farzad;Ranjbar, Malek Mohammad
通讯作者：
Ranjbar, Malek Mohammad
纳米硅溶胶对不同种类水泥水化过程及砂浆性能影响的研究
DOI：
10.3390/ma14133653
发表时间：
2021-06-30
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Liu H;Li Q;Su D;Yue G;Wang L
通讯作者：
Wang L
影响因子：
2.2
作者：
Lesko, S;Lesniewska, E;Goudonnet, JP
通讯作者：
Goudonnet, JP
影响因子：
7.4
作者：
Bentz, Dale P.;Ardani, Ahmad;Weiss, W. Jason
通讯作者：
Weiss, W. Jason