PREPARATION OF LIGHTWEIGHT CONCRETE AND LIGHTWEIGHT AGGREGATE FROM BAGASSE ASH AND COCONUT SHELL ASH
Keywords:
Biomass power plant ash, bagasse ash, coconut shell ash, cold bonded pelletization, lightweight aggregateAbstract
Biomass ash is a waste by-product of biomass power plants which use biomass as fuel to produce electricity. Bagasse and coconut shell ashes are two of the main biomass ashes in Thailand. Ash disposal requires large area of land and could have a negative impact on the environment. One method to manage biomass ash sustainably is to use it as raw material in lightweight aggregate production. Cold bonded pelletization (CBP) process is a forming method in which artificial aggregate is produced from waster powder via addition of bonding agent such as Portland cement on an angled rotary pan. This technique has several advantages over sintering method including lower production cost and energy consumption. This study investigates the utilization of bagasse ash and coconut shell ash to produce artificial lightweight aggregate and reports the properties of the artificial lightweight aggregate and compare them to those of expanded clay aggregate, a commercially available lightweight aggregate. Artificial lightweight aggregates with bulk density of 858 and 1,104 kg/m3 were produced successfully from bagasse ash and coconut shell ash respectively, using 10 wt% Portland cement as binder. The test results indicate that it is possible to produce cold-bonded lightweight aggregates from bagasse ash and coconut shell ash that have comparable compressive strength to that of commercial expanded clay aggregate. Additionally, the compressive strength of lightweight concrete containing cold-bonded lightweight aggregate produced from bagasse ash and coconut shell ash were found to be 21.70 MPa and 28.34 MPa, respectively.
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