Capillary imbibition in mortars with natural pozzolan, limestone powder and slag evaluated through neutron radiography, electrical conductivity, and gravimetric analysis

被引：33

作者：

Alderete, N. ^{[1
,2
]}

Villagran Zaccardi, Y. ^{[1
,2
]}

Snoeck, D. ^{[1
]}

Van Belleghem, B. ^{[1
]}

Van den Heede, P. ^{[1
]}

Van Tittelboom, K. ^{[1
]}

De Belie, N. ^{[1
]}

机构：

[1] Univ Ghent, Fac Engn & Architecture, Dept Struct Engn, Magnet Lab Concrete Res, Tech Lane,Ghent Sci Pk,Campus A, B-9052 Ghent, Belgium

[2] Consejo Nacl Invest Cient & Tecn, LEMIT, 52 Entre 121 & 122 S-N, RA-1900 La Plata, Buenos Aires, Argentina

来源：

CEMENT AND CONCRETE RESEARCH | 2019年 / 118卷

基金：

比利时弗兰德研究基金会;

关键词：

Neutron radiography; Supplementary cementitious materials; Capillary imbibition; Conductivity; Water ingress; CEMENTITIOUS MATERIALS; WATER PENETRATION; PORE STRUCTURE; ABSORPTION; CONCRETE; RESISTIVITY; TRANSPORT; POROSITY; CRACKS;

D O I：

10.1016/j.cemconres.2019.02.011

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The description of the capillary imbibition phenomenon can help to understand and enhance the durability of cementitious materials containing supplementary cementitious materials (SCMs). We studied the effect of slag, natural pozzolan and limestone powder on mortars by means of gravimetric analysis, electrical conductivity and neutron radiography during capillary imbibition. From the conductivity and water uptake results, the dominant dilution effect of limestone powder was revealed whereas refinement of the pore structure was obtained when using slag or natural pozzolan. Results from gravimetric analysis showed a good correspondence with the recently proposed fourth root of time approach. Calculations based on the neutron radiographs showed that the main water flow also advances with the fourth root of time. This gives support to the hypothesis of variable hydraulic diffusivity in cementitious materials. Furthermore, during the first 6 h, the water front did not follow the sharp front model that is usually assumed.

引用

页码：57 / 68

页数：12

共 37 条

[31] Neutron Radiography Based Visualization and Profiling of Water Uptake in (Un)cracked and Autonomously Healed Cementitious Materials [J].