Abstract
Rheology of concrete plays a major role in concrete 3D printing applications, where the concrete is pumped at high pressure and extruded through a nozzle at low speed to build the structural component. The 3D printable concrete should be stiff and is different to normal or self-compacting concrete. Hence, the common testing methods used to estimate the rheological parameters are not suitable for 3D printable concrete. In this study, the direct shear test is trialled as a potential method to measure the rheological parameters of different mixes of concrete. The effects of water–cement ratio and shear rates on rheological parameters were examined. The tests were carried out with varying shear rates, ranging from 0.5 to 15 min−1, and normal stresses, ranging from 2 to 15 kPa, for mixes with water–cement ratios of 0.3, 0.4 and 0.6. Further testing was carried out on mixes with varying aggregate to cement and fine to total aggregates ratios to study the effect of binder and aggregate proportions on the rheology of mortar. It was found that the shear rates, 0.5 to 15 min−1, have little effect on the cohesion values and friction angles. Further, the behaviour of the mixes was found to be following the Mohr–Coulomb model.
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References
Wolfs R, Salet T, Hendriks B (2015) 3D printing of sustainable concrete structures. In: Proceedings of IASS annual symposia, vol 2. International Association for Shell and Spatial Structures (IASS), pp 1–8
Lim S, Buswell RA, Le TT, Austin SA, Gibb AG, Thorpe T (2012) Developments in construction-scale additive manufacturing processes. Autom Constr 21:262–268
Alfani R, Guerrini G (2005) Rheological test methods for the characterization of extrudable cement-based materials—a review. Mater Struct 38(2):239–247
Ferraris CF, Brower LE, Banfill P (2001) Comparison of concrete rheometers: international test at LCPC (Nantes, France) in October, 2000. National Institute of Standards and Technology Gaithersburg, MD, USA
Le TT, Austin SA, Lim S, Buswell RA, Gibb AG, Thorpe T (2012) Mix design and fresh properties for high-performance printing concrete. Mater Struct 45(8):1221–1232
Assaad JJ, Harb J, Maalouf Y (2014) Measurement of yield stress of cement pastes using the direct shear test. J Nonnewton Fluid Mech 214:18–27
Perrot A, Rangeard D, Pierre A (2016) Structural built-up of cement-based materials used for 3D-printing extrusion techniques. Mater Struct 49(4):1213–1220
Roussel N, Lanos C, Toutou Z (2006) Identification of Bingham fluid flow parameters using a simple squeeze test. J Nonnewton Fluid Mech 135(1):1–7
Assaad JJ, Harb J (2012) Assessment of thixotropy of fresh mortars by triaxial and unconfined compression testing. Adv Civ Eng Mater 1(1):1–18
Lu G, Wang K (2010) Investigation into yield behavior of fresh cement paste: model and experiment. ACI Mater J 107(1):12
Girish S, Santhosh B (2012) Determination of Bingham parameters of fresh Portland cement concrete using concrete shear box. Bonfring Int J Ind Eng Manag Sci 2(4):84
Lu G, Wang K (2011) Theoretical and experimental study on shear behavior of fresh mortar. Cement Concr Compos 33(2):319–327
Bingham EC (1922) Fluidity and plasticity, vol 2. McGraw-Hill, New York
M’barki A, Bocquet L, Stevenson A (2017) Linking rheology and printability for dense and strong ceramics by direct ink writing. Sci Rep 7(1):6017
Buswell RA, Leal da Silva WR, Jones SZ, Dirrenberger J (2018) 3D printing using concrete extrusion: a roadmap for research. Cem Concr Res 112:37–49
Roussel N (2006) A thixotropy model for fresh fluid concretes: theory, validation and applications. Cem Concr Res 36(10):1797–1806
Sharma MR, Baxter CD, Hoffmann W, Moran K, Vaziri H (2011) Characterization of weakly cemented sands using nonlinear failure envelopes. Int J Rock Mech Min Sci 1(48):146–151
Toutou Z, Roussel N, Lanos C (2005) The squeezing test: a tool to identify firm cement-based material’s rheological behaviour and evaluate their extrusion ability. Cem Concr Res 35(10):1891–1899
Schanz T, Vermeer P (1996) Angles of friction and dilatancy of sand. Géotechnique 46(1):145–152
Bolton M (1986) The strength and dilatancy of sands. Geotechnique 36(1):65–78
Vermeer PA, De Borst R (1984) Non-associated plasticity for soils, concrete and rock. J HERON 29(3):1984
Di Carlo T, Khoshnevis B, Carlson A (2013) Experimental and numerical techniques to characterize structural properties of fresh concrete. In: ASME 2013 international mechanical engineering congress and exposition. American Society of Mechanical Engineers, pp V009T010A062–V009T010A062
Wolfs R, Bos F, Salet T (2018) Early age mechanical behaviour of 3D printed concrete: numerical modelling and experimental testing. Cem Concr Res 106:103–116
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Jayathilakage, R., Sanjayan, J. & Rajeev, P. Direct shear test for the assessment of rheological parameters of concrete for 3D printing applications. Mater Struct 52, 12 (2019). https://doi.org/10.1617/s11527-019-1322-4
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DOI: https://doi.org/10.1617/s11527-019-1322-4