Depth profiles of carbonates fonned during natural carbonation

被引:139
作者
Houst, YF [1 ]
Wittmann, FH
机构
[1] Ecole Polytech Fed Lausanne, Lab Technol Poudres, Inst Mat, CH-1015 Lausanne, Switzerland
[2] Qingdao Inst Architecture & Engn, Qingdao, Peoples R China
关键词
microstructure; carbonation; diffusion; durability; portland cement;
D O I
10.1016/S0008-8846(02)00908-0
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The depth profiling of carbonates formed during a natural carbonation of mortars with one face exposed directly to rain and the opposite face sheltered have been measured. The amount of carbonates formed on mortars sheltered from rain is generally higher. The depth of carbonation evaluated by the phenolphthalein test cannot be directly correlated with the carbonate profile. The CO2 diffusion coefficients calculated on the basis of the distribution of carbonates are of the same order of magnitude as those measured by a direct method. A threshold value of diffusivity appears when the sand concentration increases. This point is discussed and compared with other characteristics of mortars and concretes that exhibit similar behavior. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1923 / 1930
页数:8
相关论文
共 19 条
[1]  
ALEXANDER MG, 1999, RILEM PUB S A R I
[2]  
[Anonymous], 1995, PERFORMANCE CRITERIA
[3]  
BARON J, 1994, PK METH S DUR CONCR, P21
[4]   MODELING OF THE TRANSITION ZONE POROSITY [J].
BOURDETTE, B ;
RINGOT, E ;
OLLIVIER, JP .
CEMENT AND CONCRETE RESEARCH, 1995, 25 (04) :741-751
[5]  
CARCASSES M, 1998, INT TRANSITION ZONE, P73
[6]  
GIRARDET F, 1981, INT S OCT 1981 CTR C, P91
[7]   INFLUENCE OF POROSITY AND WATER-CONTENT ON THE DIFFUSIVITY OF CO2 AND O2 THROUGH HYDRATED CEMENT PASTE [J].
HOUST, YF ;
WITTMANN, FH .
CEMENT AND CONCRETE RESEARCH, 1994, 24 (06) :1165-1176
[8]  
HOUST YF, 1993, INTERFACES CEMENTITI, P279
[9]  
Houst YF, 1996, INT Z BAUINSTANDSETZ, V2, P49
[10]  
KASHINO N, 1984, 3 INT C DUR BUILD MA, V3, P176