Abstract
A multicell isoperibolic — semiadiabatic calorimeter was used for the measurement of temperature and the determination of the hydration heat evolution at earlier period of cement pastes setting and hardening. The measurements were aimed at the determination of the effect of superplasticizers (SPs) on the course of the Portland cement hydration. Commercial polycarboxylate SP was added to the mixtures and the heat effect was measured. With the increasing content of SP, the hydration temperature increased up to a certain value and then decreased. In case of a sufficient amount of water in the mixture to achieve complete hydration of cement, samples with the highest values of the maximum hydration temperature reached the highest values of the released total heat. If there is not a sufficient amount of water to achieve complete hydration, the samples with the highest values of the maximum hydration temperature reach the lowest values of the released total heat.
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© 2013 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Immobilisation of Clostridium spp. for production of solvents and organic acids
- A multi-analytical approach to amber characterisation
- Performance and lifetime of slurry packed capillary columns for high performance liquid chromatography
- Simultaneous determination of 32 antibiotics in aquaculture products using LC-MS/MS
- In vitro and in silico inhibition of angiotensin-converting enzyme by carbohydrates and cyclitols
- 5-Bromo- and 3,5-dibromo-2-hydroxy-N-phenylbenzamides — inhibitors of photosynthesis
- Biotransformation of iminodiacetonitrile to iminodiacetic acid by Alcaligenes faecalis cells immobilized in ACA-membrane liquid-core capsules
- Kinetics of metribuzin degradation by colloidal manganese dioxide in absence and presence of surfactants
- Asymmetric deformation of bubble shape: cause or effect of vortex-shedding?
- Equilibrium of chiral extraction of 4-nitro-d,l-phenylalanine with BINAP metal complexes
- Influence of superplasticizers on the course of Portland cement hydration
- Effect of valence of copper on adsorption of dimethyl sulfide from liquid hydrocarbon streams on activated bentonite
- Kinetics of tartrazine photodegradation by UV/H2O2 in aqueous solution
- Effect of exopolymeric substances on the kinetics of sorption and desorption of trivalent chromium in soil
- Thermal stability, antioxidant activity, and photo-oxidation of natural polyphenols
- Kinetics of chloride substitution in [Pt(bpma)Cl]+ and [Pt(gly-met-S,N,N)Cl] complexes by thiourea, nitrites, and iodides
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