An Evaluation of the Physical and Chemical Stability of Dry Bottom Ash as a Concrete Light Weight Aggregate

Abstract

Compared to the bottom ash obtained by a water-cooling system (wBA), dry process bottom ash (dBA) makes hardly any unburnt carbon because of its stay time at the bottom of the boiler and contains less chloride because there is no contact with seawater. Accordingly, to identify the chemical stability of dBA as a lightweight aggregate for construction purposes, the chemical properties of dBA were evaluated through the following process of the reviewing engineering properties of a lightweight aggregate (LWA). Typically, river gravel and crushed gravel have been used as coarse aggregates due to their physical and chemical stability. The coal ash and LWA, however, have a variety of chemical compositions, and they have specific chemical properties including SO3, unburnt coal and heavy metal content. As the minimum requirement to use the coal ash and lightweight aggregate with various chemical properties for concrete aggregate, the loss on ignition, the SO3 content and the amount of chloride should be examined, and it is also necessary to examine heavy metal leaching even though it is not included in the standard specifications in Korea. Based on the results, it is believed that there are no significant physical and chemical problems using dBA as a lightweight aggregate for concrete.

Characteristic of Asphalt Mixture using Fly Ash and Bottom Ash Substitution in Reducing Environment Pollution

“…rom the coal combustion process at power plants that h so that bottom ash will fall to the bottom of the co opper (ash hopper) [13]. Bottom ash is categorized int e type of furnace, namely dry bottom boiler which pro ne boiler which produces wet bottom ash (boiler slag) [1 d wet bottom ash has been used as a substitute for fine in the United States and has shown satisfactory results xible pavement is in West Virginia, United States, whe phalt mixtures is six to seven percent of the weight of e erate traffic volume, showing satisfactory results throug ry bottom ash as fine aggregate for rigid pavements at an increase in strength and impermeability when comp ure will affect the stability of the mixture, this is due to ent is too high it can cause the mixture to become too ller has the properties of elasticity of the mixture and nsity and reduce the permeability of the mixture.…”

Pulp and Paper Wastewater Treatment with Bottom Ash Using Jar Test

“…Bottom ash has high basicity or is more alkaline (Kim et al, 2021). Hence, bottom ash adsorbent can increase the pH of wastewater without heating or heating to 8.6.…”

The Potential of High Flow Concrete Mixtures Utilizing Recycled Coal Bottom Ash as Underground Cable Trench Backfill Material

“…Although there are some applications for the recycling of CBA, the overall utilization of this material is still low. For example, 60% of the CBA generated in Korea is landfilled, and only 40% is recycled [6]. In Coal Power Plants, unutilized CBA are generally disposed through landfilling in ash ponds, which are ring embankments engineered specifically to prevent any release of leachate to groundwater and to the surrounding area.…”