Sewage Sludge as Raw-Material in Asphalt Mixtures

Abstract

The aim of this study is to assess the volumetric and mechanical behavior of concrete asphalt mixtures, using natural sludge as a partial substitute for the tiny aggregate and calcined sludge as filler. This assessment was performed based on technical and environmental parameters, using laboratory tests obeying current Brazilian norms, according to international standards. The addition of natural sludge to the mixtures has increased stability, increased air voids contents of the mixtures. The addition has compromised mixture adhesiveness. With respect to the addition of calcined sludge to the mixtures, the mixtures with calcined sludge displayed the same behavior as those with cement. It was observed decrease in empty space volume of the mixtures and consequent increase in empty space-bitumen relation and increased stability. The mixture addition of natural sludge that has the best mechanical and volumetric performance is the one with 7.5% of natural sludge in the granulometric composition of the mixture. The mixture with 1% of calcined sludge had the best volumetric and mechanical performance.

Effects of Sewage Sludge Ashes Addition in Portland Cement Concretes

“…Different ways of using SSA as construction material are suggested [2][3][4][5][6][7][8][9][10] as alternatives for the beneficial recycling of raw material.…”

Use of Sewage Sludge as Raw Material in the Manufacture of Roofs

“…In this context, in Brazil, researches have been developed to study the sewage sludge as a raw material for the civil construction industry [1][2][3][4][5][6][7][8][9][10][11][12][13][14].Internationally, early studies showing feasibility of recycling waste in the construction industry began in the 1980s, providing important information for future studies [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”