Abstract
Recycled concrete powder (RCP) mostly consisting of cement paste could be reused as partial cement replacement. The aim of this paper is to compare hydration and mechanical properties of RCP and two types of silica sand powder (SSP). Comparison of those materials combined with cement can highlight the binder properties of recycled concrete powder. Using of two types of SSP also show an influence of their fines on hydration process and mechanical properties. Particle size analysis and calorimetric measurement were carried out and mechanical properties such as bulk density, dynamic Young’s modulus and compression strength were examine. Calorimetric measurement proves the presence of exposed non-hydrated particles in RCP that can react again. However lower density of old cement paste in RCP overweight the mentioned potential of RCP and mechanical properties are decreasing compared with reference cement paste and cement paste SSP.
Highlights
The great popularity of cement composites such as concrete in the building industry, among other things, bring difficulties of recycling old materials from demolitions and reconstructions
As can be seen the mechanical properties of samples with recycled concrete powder (RCP) are despite the hydration of cement grains in RCP decreased compared with other samples. This decrease was probably caused by lower density of old cement paste in RCP compared with silica sand powder (SSP) and new hydration products and simultaneously by high amount of very fine particles
In this experiment the RCP was used to fulfills the role of micro filler and partial cement replacement
Summary
The great popularity of cement composites such as concrete in the building industry, among other things, bring difficulties of recycling old materials from demolitions and reconstructions. To eliminate influence of larger nucleation area (caused by presence of fine particles in RCP) on hydration process the inert silica sand powder was used to comparison Due to his crystalline character, the pozzolanic activity of SiO2 should be minimal compared with amorphous SiO2, which is used as reactive additive [10, 11]. Comparison of those materials combined with cement can highlight the binder properties of RCP and influence of recycled concrete powder on hydration process can be defined [12, 13]. Results of those two types silica sand powder should help to further modification properties of recycled concrete powder
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