For Groups 2–5, the scale inhibitor was added 30 min after CaCl2and NaHCO3addition; a hanging piece of carbon steel (size 5 × 3) was added to the beaker 30 min after the addition of the scale inhibitor. The experiment lasted for 24 h. After 24 h, the hanging pieces ...
and extractable sulfur were determined. The results showed that the San José soil had a pH buffering capacity three times higher than that of the Licantén soil. The linear increase in pH was thus explained by the soil type in relation to the applied rate of CaCO3. The analysis of the ...
An Alkali–Silica Reaction (ASR) test was performed on prismatic specimens 25 × 25 × 254 mm (1 × 1 × 10-in), as per ASTM C1260, where sand with a high reactivity from a local source was used. The changes in length of the specimens were measured as per ASTM C157 at 5, 10,...
The effect of CaCO3 nanoparticles on the photoaging process of LDPE was further investigated. 2. Experiment 2.1. Materials Polyethylene was purchased from Aldrich, density: 0.925 g cm−3, melt index: 25 g/10 min (190 ◦C/2.16 kg); impact strength: 45.4 J/m (Izod, ASTM D 256, −...
The pH value of the medium was adjusted by 1 mol/L NaOH solution and 1 mol/L HCl solution. The pH value of the saline–alkaline medium was adjusted to 9, while the neutral medium was adjusted to pH 7. The pH of the solution was measured with a pH detector while adding NaOH or ...