TY - CHAP
T1 - Use of Basic Oxygen Furnace Slag (BOFS) in Superpave Mix Design
T2 - BOFS Aggregate Properties
AU - Shon, Chang Seon
AU - Kim, Jong Ryeol
AU - Kissambinova, Aizhan
AU - Sandybay, Saken
AU - Orazayeva, Saltanat
AU - Dossayev, Nurzhan
AU - Chzhen, Pavel
N1 - Publisher Copyright:
© 2023 Trans Tech Publications Ltd, Switzerland.
PY - 2023
Y1 - 2023
N2 - This research aims to evaluate the properties of basic oxygen furnace slag (BOFS) as aggregates used in Superior Performing Asphalt Pavements (Superpave) mix design. A total of five different aggregates, including one limestone and four BOFS aggregates with different ages, were evaluated by the following aggregate properties: specific gravity, water absorption, Los Angles abrasion, aggregate crushing value, angularity, flakiness, soundness (sulfate chemical and freeze-thaw resistance), and expansion characteristics. Then, the volume stability of the hot mix asphalt (HMA) mixture was also discussed based on the aging effect of BOFS aggregate. Test results indicated that aged BOFS aggregate performs better than unaged BOFS aggregate: Aged BOFS aggregate has lower water absorption, lower aggregate crushing value, higher abrasion resistance, and less expansion. The flakiness and angularity of BOFS aggregates were satisfied with Superpave criteria. However, if free-lime (f-CaO) and free magnesium (f-MgO) in BOFS aggregate exist, it may cause the volume stability of asphalt mixtures with BOFS aggregate. In conclusion, if BOFS is appropriately aged and weathered, BOFS can be an alternative to conventional aggregate.
AB - This research aims to evaluate the properties of basic oxygen furnace slag (BOFS) as aggregates used in Superior Performing Asphalt Pavements (Superpave) mix design. A total of five different aggregates, including one limestone and four BOFS aggregates with different ages, were evaluated by the following aggregate properties: specific gravity, water absorption, Los Angles abrasion, aggregate crushing value, angularity, flakiness, soundness (sulfate chemical and freeze-thaw resistance), and expansion characteristics. Then, the volume stability of the hot mix asphalt (HMA) mixture was also discussed based on the aging effect of BOFS aggregate. Test results indicated that aged BOFS aggregate performs better than unaged BOFS aggregate: Aged BOFS aggregate has lower water absorption, lower aggregate crushing value, higher abrasion resistance, and less expansion. The flakiness and angularity of BOFS aggregates were satisfied with Superpave criteria. However, if free-lime (f-CaO) and free magnesium (f-MgO) in BOFS aggregate exist, it may cause the volume stability of asphalt mixtures with BOFS aggregate. In conclusion, if BOFS is appropriately aged and weathered, BOFS can be an alternative to conventional aggregate.
KW - aggregate properties
KW - basic oxygen furnace slag
KW - expansion
KW - Superpave
UR - https://www.scopus.com/pages/publications/85169154056
UR - https://www.scopus.com/pages/publications/85169154056#tab=citedBy
U2 - 10.4028/p-guZBG4
DO - 10.4028/p-guZBG4
M3 - Chapter
AN - SCOPUS:85169154056
T3 - Key Engineering Materials
SP - 147
EP - 154
BT - Key Engineering Materials
PB - Trans Tech Publications
ER -