Influence of Activator Modulus on Tensile and Compressive Properties of High Ductile Alkali-activated Slag Composites
In order to explore the changes of tensile and compressive properties of high ductile alkali-activated slag composites under different alkaline activator modulus,uniaxial compressive and tensile tests are performed on the high ductile alkali-activated slag composites with the modulus of 0.5-1.6.At the same time,the hydration degree is measured by loss-on-ignition (LOI).Its high ductile mechanism is analyzed through three-point bending and single-crack tensile tests.The results show that as the activator modulus increases,the compressive and tensile strengths of alkali-activated slag composites show the downward trend.The tensile strain first increases and then decreases with the increase of the modulus,and it reaches the optimum in the range of 0.8-1.1.In accordance with the change trend of strength,the content of chemically bound water gradually decreases with the increase of the modulus.The fracture toughness and energy of the matrix are consistent with the change trend of the strength.The maximum stress and the residual energy of the fiber bridging are similar to the change law of the strain.The pseudo strain hardening performance (PSH) index can reasonably reflect the magnitude of the tensile strain.
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