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Evaluating the use of waste-to-energy bottom ash as road construction materials.
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2014-02-01
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[PDF-3.01 MB]
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Abstract:Current management practice, existing regulations, and environmental consequences of municipal solid
waste incineration (MSWI) ash utilization were comprehensively reviewed worldwide and nationwide
in the U.S. Efforts were made to physically and chemically characterize different types of MSWI ash
and also to evaluate their influence on engineering properties of cement paste and concrete when part of
Portland cement (PC) and fine aggregate are replaced with ground and sieved MSWI ash. Fundamental
properties of MSWI bottom ash and fly ash were studied by conducting physical, microstructural, and
chemical tests. Cement paste and concrete cylinders were cast with various amounts of ash additions
and their strength and durability were investigated as the replacement ratio of ash increases.
The MSWI bottom ash was also used to replace fine aggregate in hot-mix asphalt (HMA). Varying
proportions of bottom ash and fine aggregate were tried in an effort to determine the optimum ratio of
bottom ash to fine aggregate, as determined by performance tests such as the Marshall stability test and
the moisture susceptibility test. For the optimum replacement ratio of bottom ash, the optimum binder
content required was evaluated.
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