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Geopolymer concrete (GPC) uses an alternative binder that bases on a mixture of fly ash and ground blast furnace slag activated by alkaline solution as a placement of cement. This material shows excellent engineering performance and friendly to the environment in comparison to ordinary cement. Currently, in Vietnam, there is a modest number of fundamental researches on the geopolymer mechanical properties and application of this novel material in the building structures as well. The paper presents the study on the coefficient γ, that accounts for the plastic deformation in the tensile zone in the calculation of the cracking moment for reinforced GPC beams based on the stress-strain model of concrete in the current standard TCVN 5574:2018. It is shown that this coefficient depends on the elastic coefficient of the concrete in tension taken by the compressive class of GPC. The theoretical approach is verified by experimental works that consist of testing on the behaviour of 9 reinforced GPC beams by the author and also a series of experimental results of 25 reinforced concrete beams published by other researchers over the world.

Nghiên cứu lý thuyết và thực nghiệm về mô men kháng nứt của dầm geopolymer cốt thép