Structure of calcium silicate hydrates formed in alkaline-activated slag:: Influence of the type of alkaline activator
Structure of calcium silicate hydrates formed in alkaline-activated slag:: Influence of the type of alkaline activator
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DOI：
10.1111/j.1151-2916.2003.tb03481.x
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发表时间：
2003-08-01
影响因子：
3.9
通讯作者：
Sanz, J
中科院分区：
文献类型：
--
作者：
Fernández-Jiménez, A;Puertas, F;Sanz, J
采用FTIR、Si-29和Al-27魔角散射核磁共振和TEM/EDX技术研究了碱激发剂（NaOH、水玻璃或Na 2CO 3）对碱矿渣水泥浆体中水化硅酸钙结构的影响。在所有情况下，在活化7天后形成的主要产物，用活化剂给出4%的Na 2 O浓度，是具有dreierkette型阴离子的半结晶硅酸钙水合物。在这些结构中，硅酸盐四面体（Q（2）单元）的线性有限链连接到中心的Ca-O层，四面体铝占据链中的桥接位置。主链长度和掺入四面体链中的铝的量取决于所使用的活化剂。Q（3）硅实体的检测碱活化炉渣中讨论有关可能形成的交联结构，可能是负责增加AAS砂浆的抗弯和抗压强度。
The influence of the alkaline activator (NaOH, waterglass, or Na2CO3) on the structure of the hydrated calcium silicate formed in alkali-activated slag (AAS) cement pastes has been investigated by FTIR, Si-29 and Al-27 magic-angle scattering nuclear magnetic resonance, and TEM/EDX techniques. In all cases, the main product formed after 7 d of activation, with activators giving an Na2O concentration of 4%, is a semicrystalline calcium silicate hydrate with a dreierkette-type anion. In these structures, linear finite chains of silicate tetrahedra (Q(2) units) are linked to central Ca-O layers, and tetrahedral aluminum occupies bridging positions in the chains. The main chain length and the amount of aluminum incorporated in the tetrahedral chains depend on the activator used. The detection of Q(3) silicon entities in alkaline-activated slags is discussed in relation to the possible formation of cross-linked structures that may be responsible for increased flexural and compressive strengths in AAS mortars.