Effect of MHEC on evaporation and hydration characteristics of glue mortar
article
The influence ofmethylhydroxyethylcellulose (MHEC) on bothmoisture distribution and hydration characteristics
of glue mortar using nuclear magnetic resonance imaging (NMR) is investigated. MHEC is added to glue mortar in
order to control the drying rate by increasing the open time. Besides drying,MHEC might influence hydration characteristics
ofmortar. In this study, we therefore examined the effect ofMHEC on the hydration characteristics of unsealed
mortar. Without MHEC, the evaporation time is faster than hydration time and the water distribution is
homogeneous in the mortar, resulting in poor hydration. Addition of MHEC N1.3 wt.% exhibits an evaporation
time comparable to the hydration time of mortar. However, in that case, inhomogeneous distribution of water
causes differences in the degree of hydration throughout the mortar sample, i.e. the top surface shows poor hydration
and the bottom surface shows good hydration, as confirmed by MIP and T2 relaxation analysis
of glue mortar using nuclear magnetic resonance imaging (NMR) is investigated. MHEC is added to glue mortar in
order to control the drying rate by increasing the open time. Besides drying,MHEC might influence hydration characteristics
ofmortar. In this study, we therefore examined the effect ofMHEC on the hydration characteristics of unsealed
mortar. Without MHEC, the evaporation time is faster than hydration time and the water distribution is
homogeneous in the mortar, resulting in poor hydration. Addition of MHEC N1.3 wt.% exhibits an evaporation
time comparable to the hydration time of mortar. However, in that case, inhomogeneous distribution of water
causes differences in the degree of hydration throughout the mortar sample, i.e. the top surface shows poor hydration
and the bottom surface shows good hydration, as confirmed by MIP and T2 relaxation analysis
TNO Identifier
533838
Source
Cement and Concrete Research, 83, pp. 97-103.
Pages
97-103
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