UTILIZATION OF SEWAGE SLUDGE ASH AND GREEN MUSSEL ASH AS PARTIAL SUBSTITUTE FOR CEMENT AND FINE AGGREGATE

• Main Author: FEBRIWAN - NIM : 25014306, FENDY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27282
• Institution: Institut Teknologi Bandung

<p align="justify">More production equals more waste, this statement holds true for NGCC power plant as well. Research consist of utilization of sewage sludge from NGCC wastewater treatment plant. There have been lots of research that utillize sludge either as cement or aggregate replacement but most of it results in substantial degradation in compression strength. Aside from sewage sludge, this research also utilize green mussel shells which is also a growing enviromental hazard. Reason being when both waste is combined, the chemical composition is similar to those of portland cement. XRF results show that mussel ash consist primarily of CaO (96%), whilst sewage sludge ash contains SiO2 (23%) and Al2O3 (13%) which is all main ingredient of portlant cement. Both waste were then incinerated in temperature of 1000° C then crushed and filtered using no#50 sieve (0.3 mm). This ensures that organic content on both waste is eliminated, pozzolanic and cementious behavior of the ash is activated, and the matrix of concrete is compact. <br /> <br /> Three different group of concrete were prepared. First grup is a normal concrete with w/c ratio of 0.5 as control specimen (C0). The second group is concrete with waste addition (sludge and mussel ash) as a replacement of fine aggregate at different contents of 5% (C1), 10% (C2) and 15% (C3). The last group is concrete with waste addition as a replacement for both cement and fine aggregate at different contents of 5% (C4), 10% (C5) and 15% (C6). The concrete is then subjected to compressive strength test at different ages of curing (3,7,14 and 28 days). Results show that concrete on second group (C1, C2, C3) perform much better than control specimen, reaching up to 38% increase on compressive strength. The third group however varies as C4 and C5 obtained 12% increase in compressive strength whilst C6 had an equal compressive strength as control specimen. Despite the increase on compressive strength, there’s clear degradation of workability on all sample compared to control specimen which hinders the casting process.<p align="justify">