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Investigation of steel wire mesh reinforcement method for 3D concrete printing

Liu Miao, Zhang Qiyun, Tan Zhendong, Wang Li, Li Zhijian, Ma Guowei

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 1

406--423

3D concrete printing has received widespread attention and been developed for an increasing number of applications. However, a major challenge facing this technology is an effective way to introduce reinforcement into continuously deposited cementitious material. In this study, different layers of steel wire meshes (SWM) are employed to reinforce the 3D printed structures to improve mechanical capacities. Both destructive (bending, compression and splitting) and non-destructive (using electro-mechanical impedance) tests are employed to characterize the impact of this reinforcement method. The damage accumulation process is measured through the smart PZT patches based on the electro-mechanical impedance method. The results indicate that reinforced 3D-printed components with SWM change their failure modes from brittle to ductile. The peak loads are increased by 59.2–173.3% and the deflection capacity can be increased by more than 11 times than the non-reinforced one. Different mechanical responses of print and cast samples under compression are studied. The splitting tensile strength of wire mesh reinforced concrete is also measured, which is 43.7% higher than the non-reinforced sample. The calculating methods of the cracking moment and ultimate moment of steel wire mesh reinforced 3D printed concrete are presented. Comparison between the calculated and the experimental results verifies the effectiveness in predicting the ultimate moment. Experimental results show that it is feasible and effective to employ steel wire mesh for strength and toughness enhancement of 3D printed structures.

Możliwości zastosowania siatek stalowych w warunkach zagrożeń dynamicznych

Cała M., Roth A.

Górnictwo i Geoinżynieria

2007

R. 31, z. 3/1

125-133

W artykule zajęto się problematyką nośności elementów i systemów obudowy w warunkach zagrożeń dynamicznych. Opisano wyniki badań stanowiskowych oraz in situ dotyczące zdolności pochłaniania energii dynamicznej zarówno przez elementy obudowy, jak i systemy obudowy (kombinacja różnych elementów). Przedstawiono także charakterystykę wysokowytrzymałej siatki stalowej typu Tecco. Wraz z kotwiami stalowymi była ona obiektem badań stanowiskowych (w Australii) jak i symulacji numerycznych (w Szwajcarii). Dotychczasowe wyniki badań zdolności siatki Tecco wskazują, że może ona pochłonąć od 33,6 kN/m2 (siatka S95/3 o średnicy drutu 3 mm) do 50 kN/m (siatka S95/4 o średnicy drutu 4 mm). Są to wartości kilkunastokrotnie większe niż uzyskano dla siatek zgrzewanych czy też ogrodzeniowych. Należy zatem rozważyć możliwość zastosowana wysokowytrzymałych siatek w wyrobiskach górniczych zagrożonych zjawiskami dynamicznymi.

This paper deals with loading of the support under rockburst hazard. Such a support should be able to absorb the kinetic energy of the rock blocks ejected to mining underground opening. The high-tensile Tecco mesh, which is made of steel wire with tensile strength of 1770 MPa was described. The Tecco mesh was tested in Australia to determine the force-deflection curve and the breaking load with different bolt patterns and wire diameters. Several numerical calculations (calibrated with laboratory tests) were also performed in Switzerland. Laboratory experiments and numerical calculations showed that Tecco mesh was able to absorb energy from 33,6 kN/m2 (Tecco S95/3, wire diameter 3 mm) to 50 kN/m2 (Tecco S95/4, wire diameter 4 mm). These values are over a dozen times higher than for welded mesh or chain link mesh. The application of high-tensile steel mesh in mining openings in rockburst prone mines should be seriously considered.