A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Characterization and pozzolanic properties of sewage sludge ashes (SSA) by electrical conductivity
Abstract Urbanization and continuing population and industrial growth have led to the intensification of management issues related to residues of wastewater treatment. To reduce sludge storage and carbon dioxide emissions resulting from Portland cement production, the pozzolanic activity of sewage sludge ash (SSA) was studied as a supplementary cementitious material (SCM). The SSAs that calcined in the temperature range of 600–900 °C were characterized by XRD, XRF, and laser diffraction. The pozzolanic reaction was monitored by an electrical conductivity measurement test, which demonstrated that the decrease in conductivity of an unsaturated pozzolan/calcium hydroxide suspension is correlated with the consumption of Ca(OH)2 during 1000 s. The results indicated that the calcination of sewage sludge at 600 °C is the most adequate for use as a pozzolan as it obtained a higher loss in conductivity (88.3%) and consumed less energy during the incineration process. A good correspondence was found between the mortar compressive strength test and the conductivity test, and both indicated that pozzolanicity decreases with temperature. Therefore, this method was found to be effective and hence can be used as a rapid and simple test for the pozzolanic activity evaluation of SSA.
Characterization and pozzolanic properties of sewage sludge ashes (SSA) by electrical conductivity
Abstract Urbanization and continuing population and industrial growth have led to the intensification of management issues related to residues of wastewater treatment. To reduce sludge storage and carbon dioxide emissions resulting from Portland cement production, the pozzolanic activity of sewage sludge ash (SSA) was studied as a supplementary cementitious material (SCM). The SSAs that calcined in the temperature range of 600–900 °C were characterized by XRD, XRF, and laser diffraction. The pozzolanic reaction was monitored by an electrical conductivity measurement test, which demonstrated that the decrease in conductivity of an unsaturated pozzolan/calcium hydroxide suspension is correlated with the consumption of Ca(OH)2 during 1000 s. The results indicated that the calcination of sewage sludge at 600 °C is the most adequate for use as a pozzolan as it obtained a higher loss in conductivity (88.3%) and consumed less energy during the incineration process. A good correspondence was found between the mortar compressive strength test and the conductivity test, and both indicated that pozzolanicity decreases with temperature. Therefore, this method was found to be effective and hence can be used as a rapid and simple test for the pozzolanic activity evaluation of SSA.
Characterization and pozzolanic properties of sewage sludge ashes (SSA) by electrical conductivity
de Azevedo Basto, Priscilla (author) / Savastano Junior, Holmer (author) / de Melo Neto, Antonio Acacio (author)
2019-09-03
Article (Journal)
Electronic Resource
English
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