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ABSTRACT This study examines superabsorbent polymer (SAP) absorption, mechanical strength, hydration, and electrical resistivity of glass powder modified cement pastes. The absorption of SAP was monitored using optical microscopy and [...]

ABSTRACT This paper examines the hydration and microstructure evaluation of cement pastes modified with two types of glass powders with a fine size distribution and a class F fly ash. [...]

ABSTRACT This paper examines the mechanical strength and durability behavior of cementitious materials modified with two types of glass powders and a class F fly ash at various levels of [...]

The properties of binary and ternary cement pastes containing glass powder (GP) were examined. Hydration at early age was evaluated using semi-adiabatic calorimetry and at late ages using non-evaporable water content and thermogravimetric analysis. The transport characteristic was assessed by measuring electrical resistivity. The binary paste with slag showed the highest hydration activity compared to the binary pastes with GP and fly ash (FA). The results indicated that the pozzolanic behavior of the binary paste with GP was less than that of the binary pastes with slag or FA at late ages. An increase in the electrical resistivity and compressive strength of the binary paste with GP compared to other modified pastes at late ages was observed. It was shown that GP tends to increase the drying shrinkage of the pastes. Ternary pastes containing GP did not exhibit synergistic enhancements compared to the respective binary pastes.

This study was conducted to investigate the effect of the biofertilizers Azotobacter chroococcumand Pseudomonas fluorescenswith metribuzin in soil on growth and development of tomato (Solanum lycopersicumL.) in competition with weeds. An experimental design of randomized complete blocks with 13 treatments and 3 replicates was performed. Three levels of metribuzin including 500, 1000 and 1500 g ha−1were soil inoculated. The results reveal that tomato could better grow (considering the morphological and physiological characteristics) in competition with weeds when the biofertilizers and low doses of metribuzin are used interactively. The biofertilizers decreased the environmental stress of competition with weeds on tomato and showed no significantly positive effect on the dry weight of weeds. All the crop characteristics were significantly influenced by the biofertilizer treatments. It could be concluded that tomato survives better under the stress derived from weeds competition when biofertilizers and lower doses of metribuzin are applied.