EFFECTS OF LOW-DOSAGE LIME TREATMENT ON BENEFICIAL REUSE OF POND ASH AS SECONDARY CEMENTITIOUS MATERIALS (SCMS)

Howard Fitzgerald, Lhoist
Utsa Rashique, Lhoist
Karen Slade, Lhoist
Ian Saratovsky, Lhoist

Description

Effects of low-dosage lime treatment on beneficial reuse of pond ash as Secondary Cementitious Materials (SCMs) Authors Mr. Howard Fitzgerald - United States - Lhoist Mr. Utsa Rashique - United States - Lhoist Mrs. Karen Slade - United States - Lhoist Mr. Ian Saratovsky - United States - Lhoist Abstract Lime treatment is an effective way to dehydrate and solidify ponded coal ash, facilitating easier handling and transportation to, and compaction in a landfill. However, questions arise regarding the impact of low lime dosage on the future beneficial reuse of the treated pond ash. One such potential beneficial reuse case is its application as a Secondary Cementitious Material (SCM), especially as a pozzolan grade fly ash for mortars and for ready mixed concrete production. Given the retirement of coal fired power plants and the resulting reduction in fresh, as-produced fly ash, exploring alternatives like reclamation and beneficial reuse of ponded ash is crucial. This study investigates the feasibility of lime-treated pond ash as a pozzolan grade fly ash. The physical and chemical properties of the treated pond ash are compared to ASTM C618 standards, showing a good match. The study involved replacing various percentages of Portland Cement in a type S masonry mortar mix with the treated pond ash sample. Testing revealed satisfactory short- and long-term strength performance, along with excellent results in various other parameters like water retention, water demand, setting time, and other properties. Overall, lime-treated pond ash proved to be a potentially effective SCM in a standard mortar mix. This is a strong indicator that low dosage lime treatment of ponded ash will not adversely impact its beneficial use as an SCM in the future.

 
May 14th, 1:30 PM May 14th, 2:00 PM

EFFECTS OF LOW-DOSAGE LIME TREATMENT ON BENEFICIAL REUSE OF POND ASH AS SECONDARY CEMENTITIOUS MATERIALS (SCMS)

Grand Rapids, Michigan

Effects of low-dosage lime treatment on beneficial reuse of pond ash as Secondary Cementitious Materials (SCMs) Authors Mr. Howard Fitzgerald - United States - Lhoist Mr. Utsa Rashique - United States - Lhoist Mrs. Karen Slade - United States - Lhoist Mr. Ian Saratovsky - United States - Lhoist Abstract Lime treatment is an effective way to dehydrate and solidify ponded coal ash, facilitating easier handling and transportation to, and compaction in a landfill. However, questions arise regarding the impact of low lime dosage on the future beneficial reuse of the treated pond ash. One such potential beneficial reuse case is its application as a Secondary Cementitious Material (SCM), especially as a pozzolan grade fly ash for mortars and for ready mixed concrete production. Given the retirement of coal fired power plants and the resulting reduction in fresh, as-produced fly ash, exploring alternatives like reclamation and beneficial reuse of ponded ash is crucial. This study investigates the feasibility of lime-treated pond ash as a pozzolan grade fly ash. The physical and chemical properties of the treated pond ash are compared to ASTM C618 standards, showing a good match. The study involved replacing various percentages of Portland Cement in a type S masonry mortar mix with the treated pond ash sample. Testing revealed satisfactory short- and long-term strength performance, along with excellent results in various other parameters like water retention, water demand, setting time, and other properties. Overall, lime-treated pond ash proved to be a potentially effective SCM in a standard mortar mix. This is a strong indicator that low dosage lime treatment of ponded ash will not adversely impact its beneficial use as an SCM in the future.