Journal Published Online: 05 October 2022
Volume 11, Issue 2

Comparative Study of the Reactivity and Performance of Different Nontraditional and Natural Pozzolans in Cementitious System

CODEN: ACEMF9

Abstract

The shortage of conventional supplementary cementitious materials opens up the prospect for broader utilization of nontraditional and natural pozzolans (NNPs). The NNPs used in the study included three calcined clays, three volcanic ashes (also referred to as natural pozzolans), three ground bottom ashes, and two fluidized bed combustion ashes. The study focused on assessment of the performance of these NNPs in portland cement systems by evaluating the following parameters: (a) development of the heat of reaction in cement pastes containing 25, 30, and 35 % of NNPs by weight of cement (bwoc) by means of isothermal calorimetry; (b) measurement of the consumption of calcium hydroxide (CH) in cement pastes containing 0, 25, 30, 35, 40, and 45 % (bwoc) of NNPs after 7, 28, and 56 days of curing using thermogravimetric analysis technique; (c) determination and quantification of the reaction products by quantitative x-ray diffraction in cement pastes containing 0 and 25 % (bwoc) of NNPs after 7, 28, and 56 days of curing; and (d) measurement of the 7- and 28-day compressive strength of mortar cubes. In all cases, the cumulative heat values of pastes containing NNPs were higher than those of reference pastes containing inert fillers, confirming that all NNPs were undergoing pozzolanic reaction. For most of the NNPs, the highest amount of CH consumed was observed in systems with 35 % replacement level. The early-age CH consumption correlated well with the content of alumina in NNPs whereas the later-age data correlated better with the silica content of the NNPs. In terms of compressive strength development, the highest early-age values were observed in mortars containing calcined clays, whereas other NNPs contributed to strength development at latter ages.

Author Information

Tokpatayeva, R.
Lyles School of Civil Engineering, Purdue University, West Lafayette, IN, USA
Castillo, A.
Lyles School of Civil Engineering, Purdue University, West Lafayette, IN, USA
Yoon, J.
Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang-si, Republic of Korea
Kaladharan, G.
Department of Civil and Environmental Engineering, 212 Sackett Building, Penn Sate University, State College, PA, USA
Jafari, K.
Department of Civil and Environmental Engineering, 212 Sackett Building, Penn Sate University, State College, PA, USA
Arachchige, R. M.
Department of Civil and Environmental Engineering, 8 Clarkson Ave., Clarkson University, Potsdam, NY, USA
Rajabipour, F.
Department of Civil and Environmental Engineering, 212 Sackett Building, Penn Sate University, State College, PA, USA
Peethamparan, S.
Department of Civil and Environmental Engineering, 8 Clarkson Ave., Clarkson University, Potsdam, NY, USA
Olek, J.
Lyles School of Civil Engineering, Purdue University, West Lafayette, IN, USA
Pages: 24
Price: $25.00
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Stock #: ACEM20220021
ISSN: 2379-1357
DOI: 10.1520/ACEM20220021