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Strength, elastic modulus and fracture resistance slightly decrease with an increase in paste content.
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An increase in the paste content of the mix increased the flow velocity but reduced resistance to segregation.
The increase in cement paste content improved the mechanical properties of LWPCs.
In addition, different values of powder volume, aggregate volume and paste content in the mixture reveal different ascending and descending effects on the compressive strength.
Based on the materials used in this study, the results suggested that it is technically feasible to utilize GWG microparticles as a part of paste content in the production of SCC based on the present test results.
In this study it is shown that for a given granular class, very large disparities may be present in the adhered cement paste content, which could generate dispersion of the results of characterization tests of RCA.
Mechanical and durability aspects of concrete incorporating coarse RCA up to 30% replacement and granular RCA up to 20% replacement were found to be comparable to those of virgin aggregates, and controllable through modification of paste content and composition, in order to achieve the desired mechanical and durability properties of sustainable concrete.
An increase in porosity was also observed when increasing the paste content.
In general, concrete mixtures with higher aggregate content (and correspondingly, lower paste content) exhibit a reduced tendency to crack.
Moreover, increasing the paste content allows compensating this fluidity loss.
To avoid this issue, the second approach was developed and, in this approach, the coarse aggregate and paste contents are kept the same as in a CC mix.
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