Kontribusi Bubuk Slag Nikel Di Dalam Meminimalkan Dampak Intrusi Mikroorganisme Terhadap Perilaku Fisik Material Beton

. This paper is presents the experimental study on use of nickel slag powder in the minimization intrusion impact of microorganism to physical properties of concrete materials. The intrusion of microorganism into concrete pores is fungus (Aspegillus Niger) and yeast (Sacchromycodes ludwigi) groups. Both types of this microorganism produce organic matter is acetate acid (CH3COOH) able to react with chemical compound in concrete materials, especially calcium hydroxide and calcium silicate hydrate compound. The reaction affect on the increasing of porosity, permeability coefficient, and loss masses of concrete. The effect of intrusion of microorganism can be minimized by use 16% nickel slag powder. For concrete without nickel slag powder, physical properties tend to follow equation of geometry function (power equation equation), while the concrete of 16% nickel slag powder as indicated by equation of saturated growth rate function

Optimisasi Bubuk Slag Nikel Dengan Sistem Ternary C-A-S

. This papers study concerning optimization of nickel slag powder as substitution material to partial cement by C-A-S (CaO-Al2O3-SiO2) ternary system. Optimization conducted to determine procentage of nickel slag powder in the consuming calcium hydroxide compound as hydration product of tricalcium silicate (C3S) and dicalcium silicate (C2S) cement with water so that form secondary of calcium silicate hydrate (CSH) compound. By the phase diagram C-A-S ternary system, procentage of optimum nickel slag powder determined by intersection point between of balance line pozzolanic reaction and mixing line of material cement and nickel slag powder. Analysis result indicate that by approach of C-A-S ternary system, percentage optimum of nickel slag powder is 14,59%