Microstructure, strength, and reaction products of ground granulated blast-furnace slag activated by highly concentrated NaOH solution
Microstructure, strength, and reaction products of ground granulated blast-furnace slag activated by highly concentrated NaOH solution
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DOI：
10.1557/jmr.1994.0188
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发表时间：
1994-01
影响因子：
2.7
通讯作者：
P. Schilling;A. Roy;H. Eaton;P. Malone;Newell W. Brabston
中科院分区：
文献类型：
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作者：
P. Schilling;A. Roy;H. Eaton;P. Malone;Newell W. Brabston
磨细的高炉矿渣在5M(pH 14.7)和1.5M(pH 14.2)的氢氧化钠溶液中，水渣比为∼0.4时，进行了无侧限抗压强度测试、扫描电子显微镜、能谱和X射线衍射仪的表征。反应材料由致密的层状基质组成，夹杂着未反应的玻璃颗粒和具有较高孔隙率的反应产物区域。经X-射线衍射法鉴定为CSH(I)和(C，M)_4AH_13。C-S-H(水合硅酸钙)相主要由结构不完整的托贝莫来石层组成，夹杂着(C，M)_4H_(13)层。使用高浓度溶液(5M)产生了更高的反应程度，因此有更高的压缩强度(5M溶液28天后为38 Mpa，1.5M溶液为21 Mpa)。
Ground granulated blast-furnace slag was reacted in 5 M (pH 14.7) and 1.5 M (pH 14.2) NaOH solutions at a water/slag ratio of ∼0.4, and characterized by unconfined compressive strength testing, scanning electron microscopy, energy dispersive spectroscopy, and x-ray diffraction. The reacted material consisted of a dense layered matrix interspersed with unreacted glass particles and regions of reaction products with higher porosity. CSH(I) and (C, M)_4AH_13 were identified by x-ray diffraction. The C-S-H (calcium silicate hydrate) phase is proposed to consist mainly of structurally imperfect layers of tobermorite, interleaved with layers of (C, M)_4AH_13. Other cations, most significantly Na^+, are incorporated into the structure. Use of the highly concentrated solution (5 M) produced a higher degree of reaction and, consequently, higher compressive strength (38 MPa after 28 days for 5 M solution vs 21 MPa for 1.5 M).