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Pro113

Comparison of the expansion of mortar containing shell powder of surf clam and scallop



Author(s): Akio Watanabe, Kazumi Hirokawa, Takashi Kondo
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on Concrete with Supplementary Cementitious Materials
Editor(s): Ole M. Jensen, Konstantin Kovler and Nele De Belie
ISBN:978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 190-201
Total Pages: 12
Language : English


Abstract: Differences in the expansion characteristics of mortars manufactured with various fractions of cement replaced by surf clam shell powder (aragonite CaCO3) or scallop shell powder (calcite CaCO3) were investigated. The expansion characteristics were evaluated by conducting restrained expansion tests on the mortars in accordance with the testing methods for expansive additives for concrete given in JIS A 6202. The expansion characteristics of the mortars at an early age were also evaluated by conducting length change tests using a corrugated mold based on ASTM C1698. For a given amount of added shell powder, there are differences in the amount of expansion between scallop shell and surf clam shell, with the latter causing expansion at lower added amounts. Additionally, when SEM was used to observe the fracture surfaces of the mortars containing shell powder, large numbers of needle crystals were observed, and are thought to be related to the cause of expansion.


Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00


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