TY - JOUR
T1 - Development of a New Geopolymer Based Cementitious Material for Pumpable Roof Supports in Underground Mining
AU - Nikvar-Hassani, Arash
AU - Zhang, Lianyang
N1 - Funding Information: This study was sponsored by the Alpha Foundation for the Improvement of Mine Safety and Health, Inc. (ALPHA FOUNDATION). The views, opinions and recommendations expressed herein are solely those of the authors and do not imply any endorsement by the ALPHA FOUNDATION, its Directors and staff. Publisher Copyright: © 2020 American Society of Civil Engineers.
PY - 2020
Y1 - 2020
N2 - Ground falls are one of the significant hazards in underground mining which lead to severe fatalities and injuries. Effective roof support is critical to prevent ground falls and ground fall accidents. Several roof support techniques have been used in mining industry, including rock bolts, cribs, posts, long wall shields, cans, and pumpable roof supports. Among them, pumpable roof supports have advantages over other roof support systems and have been increasingly used in underground mines. The major constituent of a pumpable roof support system is the cementitious material such as calcium-sulfo-aluminate (CSA) cement and Portland cement currently used in practice. However, these conventional cementitious materials cannot achieve the normally conflicting responses such as high stiffness and large residual strength required for an effective roof support system. The present study investigates the feasibility of utilizing Class F fly ash and natural biopolymer to develop a hybrid geopolymer-biopolymer cementitious material having high load stiffness, high peak strength, and large residual strength. A series of laboratory tests, including setting time, viscosity, and unconfined compression tests, have been carried out. The results indicate that the new hybrid material is a promising pumpable cementitious material which can possess the normally conflicting properties of high load stiffness, high peak strength, and large residual strength.
AB - Ground falls are one of the significant hazards in underground mining which lead to severe fatalities and injuries. Effective roof support is critical to prevent ground falls and ground fall accidents. Several roof support techniques have been used in mining industry, including rock bolts, cribs, posts, long wall shields, cans, and pumpable roof supports. Among them, pumpable roof supports have advantages over other roof support systems and have been increasingly used in underground mines. The major constituent of a pumpable roof support system is the cementitious material such as calcium-sulfo-aluminate (CSA) cement and Portland cement currently used in practice. However, these conventional cementitious materials cannot achieve the normally conflicting responses such as high stiffness and large residual strength required for an effective roof support system. The present study investigates the feasibility of utilizing Class F fly ash and natural biopolymer to develop a hybrid geopolymer-biopolymer cementitious material having high load stiffness, high peak strength, and large residual strength. A series of laboratory tests, including setting time, viscosity, and unconfined compression tests, have been carried out. The results indicate that the new hybrid material is a promising pumpable cementitious material which can possess the normally conflicting properties of high load stiffness, high peak strength, and large residual strength.
UR - http://www.scopus.com/inward/record.url?scp=85081982371&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85081982371&partnerID=8YFLogxK
M3 - Conference article
SN - 0895-0563
VL - 2020-February
SP - 325
EP - 334
JO - Geotechnical Special Publication
JF - Geotechnical Special Publication
IS - GSP 316
T2 - Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure
Y2 - 25 February 2020 through 28 February 2020
ER -