Determination of Fracture Parameters of Seawater Sea Sand Concrete Based on Maximum Fracture Load
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 1
Abstract
Seawater sea sand concrete (SSC) can be applied in islands far away from the mainland. It is essential to clarify the fracture behavior of SSC which is related to the durability under the ocean environment. Thus, the present study is primarily concerned with the determination of fracture parameters of SSC. Ordinary concrete (OC) mixed by freshwater and river sand is introduced for reference. Based on the improved boundary effect model, the size-independent tensile strength and fracture toughness are determined by using the experimental maximum fracture loads of three-point-bending concrete beams. The resulting tensile strength is adopted to replace the maximum tensile stress at the fictitious crack-tip in the maximum fracture load model and the former proves to be the latter. The maximum fracture load related to the local fracture energy at the crack-tip region is then predicted. The size-independent fracture energy is given by the comparison between the analytical and experimental maximum fracture loads. The local fracture energy distributions in the SSC and OC are similar to each other. But the tensile strengths of SSC are higher than those of OC. The fracture toughness and fracture energy increase with the increasing of maximum aggregate size for SSC.
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Acknowledgments
The authors gratefully acknowledge funding from the National Natural Science Foundation of China (Grant No. 51778591) and Educational Innovation and Research Foundation of Graduate Student in Shandong Province of China (Grant No. HDJG17006).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 23, 2019
Accepted: Jun 19, 2019
Published online: Oct 19, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 19, 2020
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