English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

in the hardened cement paste – through pozzolanic reactions – additional hydration products can be formed by the use of supplementary cementing materials (scms). the expected results of these processes are: increase in strength, decrease in permeability and the improvement of other important durability properties. in the present research, properties of mortar mixtures were investigated with different cement substitution rates of scms both in fresh and hardened conditions. the consistence of mixtures was determined by flow table test, and the change in workability was repeatedly measured until 120 minutes. the specimens were stored in water up to the age of 7 days then under laboratory conditions (in climate chamber of 20±3°c temperature and rH=65% relative humidity) up to the age of 28 days. Afterwards half of the specimens were immersed into and stored under water and the other half was kept continuously under laboratory conditions. the properties of the hardened specimens (flexural tensile strength, compressive strength, water absorption, apparent density and apparent porosity) were investigated at the age of 28, 56, 90 days. seven mortar mixtures were made of cem i 42.5 n Portland cement with different cement substitution ratios of metakaolin (mk) and/or silica fume (sF). Quartz sand was used as aggregate with the range of 0/2 mm particle size. the results of consistence measurements showed that the flow values of the fresh mortar mixtures which contain scms are smaller comparing with the reference mixtures (without scms), since the physical properties of these materials (particle size, specific surface area, particle shape, etc.) influence the consistence. the specimens with smaller substitution ratio showed more effective utilization of scms in the view of strength. the water absorption and apparent porosity were higher, and at the same time the apparent density was smaller than those of the mixtures with higher substitution ratios. keywords: supplementary cementing materials, fresh mortar, hardened mortar, consistence, strength lilla MlináriK chemical engineer (msc, 2012). Graduated at the Department of Physical chemistry and materials science, Budapest university of technology and economics. started her research work in 2009 in the field of concrete admixtures (superplasticizers). since 2015, she has been PhD candidate at the Budapest university of technology and economics, Department of engineering Geology and Geotechnics. Her field of research is the influence of supplementary cementing materials on the chemical resistance of cements. Katalin KoPecsKó, PhD msc in chemical engineering, postgraduate engineering degree in concrete technology, PhD, associate professor at Bme, Dept. of engineering Geology and Geotechnics. main research fields: cement hydration, supplementary cementing materials, durability of concrete and construction materials, X-ray diffraction (XrD) and thermoanalytics (tG/DtG/DtA). member of the technical committee mszt/mt 102 “cement and Lime” for Hungarian, european and international standardization and standardization programmes. adorján Borosnyói, PhD civil engineer (msc), PhD, associate professor at the Department of construction materials and technologies, Budapest university of technology and economics. main fields of interest: durability of concrete structures, supplementary cementing materials, application of non-metallic (FrP) reinforcements for concrete structures, bond in concrete, non-destructive testing of concrete. member of fib t2.1 „serviceability models” (com1 concrete structures), fib t5.1 „FrP reinforcement for concrete structures” (com5 reinforcements), riLem technical committee isc “non destructive in situ strength assessment of concrete”.

Properties of cement mortars in fresh and hardened condition infl uenced by combined application of SCMs