Vol.8, No 2, 2010 pp. 129 - 134
UDC
691.53:666.112.5:620.174(045)=111
DOI: 10.2298/FUACE1002129R
HIGH PERFORMANCE SUPERPLASTICIZED SILICA FUME MORTARS FOR FERROCEMENT WORKS
P. Rathish Kumar
Department of Civil Engineering, National Institute of Technology,
Warangal Andhra Pradesh, India
Ferrocement works demand cement mortars of good workability and high strength. Reduction in water-cement ratio combined with a refined pore structure increases the compressive strength in addition to the enhancement of durability characteristics, but the workability decreases. Workability becomes important, as the mortar has to easily penetrate between the layers of the mesh wires. A reasonably workable high strength cement mortar can be obtained by using a high cement content coupled with the use of superplasticizers. These were also found to retain the cohesiveness and check undesirable bleeding and segregation.
An experimental program was conducted to study the functional efficacy of an SNF condensate used as a water reducing superplasticizer. The compressive strength and flow characteristics of the mortars were determined to decide their suitability for ferrocement works. The parameters included the mix proportions, the grade of cement, age of curing and the dosage of superplasticizer. It was concluded from the study that the addition of an optimum dosage of superplasticizer improved the workability and strength characteristics of silica fume mortars. There was a late gain in the compressive strength of silica fume mortars.
Key words:
Compressive Stength, Performance, Ferrocement, Superplasticizer, Silica fume.
VISOKE PERFORMANSE MALTERA SA SUPERPLASTIFIKATORIMA OD SILIKATNE PRAŠINE KOD FEROCEMENTNIH RADOVA
Zahtevi ferocemnetnih maltera su dobra obradivost i visoka čvrstoća. Smanjenjem vodo-cementnog faktora u kombinaciji sa rafiniranim porama strukture, se povećava čvrstoća i poboljšavaju se karakteristike trajnosti, ali je obradivost teža. Obradivost postaje važna, kad malter mora da lako da prodre između slojeva mreže žica. U osnovi, visoke čvrstoće cementnog maltera mogu se dobiti pomoću visokog sadržaja cementa uz korišćenje superplastifikatora. Takođe je utvrđeno da se zadržava kohezija uz kontrolu nepoželjnog curenja i segregacije.
Eksperimentalni program je sprovedena na studiji funkcionalne efikasnosti SNF kondenzata korišćenjem vode i redukcije superplastifikatora. Čvrstoća na pritisak i tečne karakteristika maltera određuju primenu ferocementa. Parametri su: razmere mešavine, kvalitet cementa cementa, dužina negovanja i doze superplastifikatora. Zaključeno je iz studije da dodatak optimalne doze superplastifikatora poboljšava obradivost i karakteristike čvrstoće maltera sa silikatnom prašinom Dobilo se najzad pojačanje čvrstoće na pritisak maltera sa silikatnom prašinom.
Ključne reči:
Čvrstoća na pritisak, ponašanje, ferocement, plastifikator, silikatna prašina
