Ettringite and C-S-H Portland cement phases for waste ion immobilization: A review
Ettringite and C-S-H Portland cement phases for waste ion immobilization: A review
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DOI：
10.1016/s0956-053x(96)00072-4
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发表时间：
1996-01-01
期刊：
影响因子：
8.1
通讯作者：
Roy, DM
中科院分区：
文献类型：
--
作者：
Gougar, MLD;Scheetz, BE;Roy, DM
综述了硅酸盐水泥中钙矾石和C-S-H相的形成、结构和化学组成，以及它们与废离子固定化的关系。这项审查的目的是调查使用波特兰水泥作为优先金属污染物(铬、铅、帕、硒、锌、银、汞、砷和镉)的宿主，以及作为放射性废物离子(Am、C、Cs、I、Np、Pu、PA、SR、TC、Th、SnU、U的各种同位素)的宿主，如40CFR 191所确定的。钙矾石在晶体结构的柱状和通道部分都充当了许多这样的离子的宿主。在钙、铝、氢氧化物和硫酸盐位置进行了取代。C-S-H还以离子和盐的形式容纳了一些废物物种。C-S-H的固定化机理包括吸附、相混合和取代。以下离子尚未被报道为被这些相中的一种特定固定：Ag、Am、Np、Pu、Pu、Pa.TC、Th和Sn.然而，其中一些离子被波特兰水泥固定.版权所有(C)1996爱思唯尔科学有限公司。
The formation, structure and chemistry of the ettringite and C-S-H phases of Portland cement have been reviewed as they relate to waste ion immobilization. The purpose of this review was to investigate the use of Portland cement as a host for priority metallic pollutants (Cr, Pb, Pa, Se, Zn, Ag, Hg, As and Cd) as identified by the Environmental Protection Agency and as a host for radioactive waste ions (various isotopes of Am, C, Cs, I, Np, Pu, Pa, Sr, Tc, Th, Sn, U) as identified in 40 CFR 191. Ettringite acts as host to a number of these ions in both the columnar and channel sections of the crystal structure. Substitutions have been made at the calcium, aluminum, hydroxide and sulfate sites. C-S-H also hosts a number of the waste species in both ionic and salt form. Immobilization mechanisms for C-S-H include sorption, phase mixing and substitution. The following ions have not apparently been reported as specifically immobilized by one of these phases: Ag, Am, Np, Pu, Pa, Tc, Th and Sn; however, some of these ions are immobilized by Portland cement. Copyright (C) 1996 Elsevier Science Ltd.