CORRELATIONS BETWEEN POZZOLANIC EVALUATION METHODS, ELECTRICAL CONDUCTIVITY AND CHEMICAL SHRINKAGE TEST

Author(s): U. Hernández-Toledo, P. Valdez-Tamez, G. Fajardo
, P. Montes, A. Durán-Herrera
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference
on Bio-Based Building Materials
Editor(s): Sofiane AMZIANE, Mohammed SONEBI and Karine CHARLET
ISBN:
e-ISBN: 978-2-35158-192-6
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 555-563
Total Pages: 9
Language : English

Abstract: The use of pozzolans is one of the main strategies of the cement industry to reduce the CO2
emissions; however, one barrier to increase the use of pozzolans is the local availability. Rapid
pozzolanic evaluation methods can facilitate the search for new pozzolanic materials and their
quality control. The pozzolanic activities of eleven materials which include two class f fly ash, two
silica fumes, metakaolin, ground granulated blast furnace slag, ground glass, sugar cane
bagasse ash and three natural pozzolans were evaluated with two types of ordinary Portland
cement and calcium hydroxide (CH). The strength activity index (mortar mixtures at 7 and 28
days of age), the Chapelle test (10.57 g/L CH and 4 g/L pozzolan suspension at 80 °C for 16 h),
chemical shrinkage (cement pastes with 10 or 20% of pozzolan at 60 °C for 3 days) and a
proposed electrical conductivity method (800 mg/L CH and 302.7 mg/L pozzolan suspension)
were compared. Simple and multivariable linear regression analysis were employed to identify
possible correlations between methods and physicochemical characteristics of materials. Only a
significant correlation (R2=0.84) was found between the CH consumption of Chapelle and the
loss of conductivity of conductivity tests. Based on this finding, the proposed conductivity method
may be useful for estimate the CH consumption of the Chapelle method.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00