Carbonation durability of blended cement pastes used for waste encapsulation

被引：15

作者：

Borges, Paulo H. R. ^{[1
,2
]}

Milestone, Neil B. ^{[2
]}

Costa, Juliana O. ^{[3
]}

Lynsdale, Cyril J. ^{[3
]}

Panzera, Tulio H. ^{[4
]}

Christophoro, Andre L. ^{[4
]}

机构：

[1] Fed Ctr Technol Educ Minas Gerais CEFET MG, Dept Civil Engn, Belo Horizonte, MG, Brazil

[2] Univ Sheffield, Dept Mat Engn, Immobilisat Sci Lab, Sheffield S1 3JD, S Yorkshire, England

[3] Univ Sheffield, Dept Civil & Struct Engn, Sheffield S1 3JD, S Yorkshire, England

[4] Univ Fed Sao Joao del Rei, Dept Mech Engn, BR-31270901 Sao Joao Del Rei, Brazil

来源：

MATERIALS AND STRUCTURES | 2012年 / 45卷 / 05期

关键词：

Durability; Carbonation; Accelerated testing; Encapsulation; ACCELERATED CARBONATION; MICROSTRUCTURE; CONCRETE;

D O I：

10.1617/s11527-011-9788-8

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Blended cement pastes are currently used for encapsulation of low level and intermediate level nuclear waste in the UK. However, there is still little information on the long-term durability of those mixes to some chemical attacks. Accelerated testing may predict the long-term durability or at least help the selection of more durable formulations. In this work, blended blastfurnace slag (BFS)/Portland cement (OPC) pastes containing 60, 75 and 90% BFS and pulverised fuel ash (PFA)/OPC pastes with 40, 55 and 75% PFA were cured at 20 and 60 degrees C for 90 days then submitted to natural and accelerated carbonation (5% CO2). The effects of the curing temperature as well as the OPC replacement level on the carbonation ratio are presented. Results showed a good correlation between natural and accelerated carbonation for the pastes studied. Carbonation was found to be governed by the amount of calcium hydroxide available in the mixes before the process started.

引用

页码：663 / 678

页数：16

共 26 条

[11] Probing the microstructure and water phases in composite cement blends [J].