Abstract
In recent years, several researchers have shown the good performance of alkali activated slag cement and concretes. Besides their good mechanical properties and durability, this type of cement is a good alternative to Portland cements if sustainability is considered. Moreover, multifunctional cement composites have been developed in the last decades for their functional applications (self-sensing, EMI shielding, self-heating, etc.). In this study, the strain and damage sensing possible application of carbon fiber reinforced alkali activated slag pastes has been evaluated. Cement pastes with 0, 0.29 and 0.58 vol % carbon fiber addition were prepared. Both carbon fiber dosages showed sensing properties. For strain sensing, function gage factors of up to 661 were calculated for compressive cycles. Furthermore, all composites with carbon fibers suffered a sudden increase in their resistivity when internal damages began, prior to any external signal of damage. Hence, this material may be suitable as strain or damage sensor.
Highlights
Portland cement production consumes large amounts of energy, and is responsible for large emissions of sulphur and nitrogen oxides, besides CO2, to the atmosphere
Environmental and economic reasons make the alkaline activation of granulated blast furnace slag (BFS) appear to be a great alternative to the conventional production of Portland cement
The main objective of the present paper is to evaluate the strain and damage sensing properties of carbon fiber-reinforced alkaline cement pastes
Summary
Portland cement production consumes large amounts of energy, and is responsible for large emissions of sulphur and nitrogen oxides, besides CO2, to the atmosphere. Materials 2013, 6 industrial products, which show pozzolanic properties, have been widely investigated as an alternative to Portland cement for cement composites [1,2,3,4,5,6,7,8,9]. Environmental and economic reasons make the alkaline activation of granulated blast furnace slag (BFS) appear to be a great alternative to the conventional production of Portland cement. The complete replacement of Portland cement by alkaline cement could be possible.
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