Effects of Self-Compacting Mortar Partially Replaced Cement with Limestone Powder and Calcined Clay on Slump Flow, Viscosity, and Compressive Strength
Keywords:
Slump flow, viscosity, self-compacting mortar, limestone powder, calcined clayAbstract
This paper presents the effects of partial cement replacement by limestone and calcined clay for producing self-compacting mortar by testing flowability and mechanical properties with slump flow viscosity and compressive strength in order to propose an alternative which is eco-friendly material in construction industry. Amount of cement replacement by calcined clay were 15% and 25%, amount of limestone replacement was 15%. The results showed that the tested viscosity increased when replacing cement by calcined clay of 15% so that it necessary to use higher superplasticizer approximately 2–2.5 times for achieving the suitable slump flow. And it needed superplasticizer of 5–6 times when increasing limestone powder of 15%. Water to binder ratio (W/B) of 40% was suitable because the viscosity of mortar slightly changed with the increase of funnel time not over 3 s after 20 mins after mixing and the initial funnel time was 4–6 s. Replacement amount by calcined clay of 15% resulted in the increased of compressive strength of approximately 20–38% at 28 days with the compressive strength of approximately 700–830 ksc. Moreover, when the replacement ratio was 25% with limestone of 15%, it was found that the compressive strength decreased approximately 15–20% which were 450–490 ksc. Calcined clay can be used to replace cement for producing self-compacting mortar, the mechanical properties was improved and flowability was the most improved with the W/B of 40%. Calcined clay was an alternative material for reducing the demand of cement use.
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