Physicochemical Characterization Of Modified
Multicomponent Binder Mortar In Relation To
Calcium Hydroxide Leaching
Author(s)
N. Mohamed Sutan, I. Yakub, S. Hamdan & Z. A. Talib
Abstract
This paper presents and discusses the results of the study on the effects of
modified multicomponent binder mortar (MMCB) on calcium hydroxide (CH)
leaching to form calcium carbonate (CaCO3) on the surface of cement based
products, investigated in laboratory environment at daily room temperature (T)
and relative humidity (RH) in the range of 18–28°C and 65–90%, respectively.
Pozzolans used as cement replacement were Fly Ash Class F (FA) and Silica
Fume (SF). Polymers used as a cement additive were styrene butadiene rubber
(SBR) (Synthomer Grade 29Y46) and styrene acrylic ester (SAE) (Revacryl
Grade 477). The influence of these materials on mortar has been discussed by
researchers separately but their combinative influence on CH leachate has not
been researched yet. CH leachate intensities in terms of percentages of (CaCO3)
resulted from Puddle Test (PT) and Standard Chemical Method (SCM) were
compared systematically between MMCB samples with unmodified control
mortar (UCM) of 0.4w/c in order to get a better understanding of how the
combination of pozzolan and polymer influence CH leaching. The findings were
discussed and substantiated physically and mechanically with the initial surface
absorption test (ISAT) and compressive strength test results and micro
structurally with the characterization and morphology of calcium hydroxide
(CH) and calcium silicate hydrate (C-S-H) from EDS and SEM images. The
results showed that MMCB had less formation of CaCO3 (calcite) compared to
UCM with validation from the physicochemical and mechanical analysis that
Keywords
modified multicomponent binder, mortar, CH, ISAT, SEM, EDS
Related Book
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