Lime–diatomaceous earth cement pastes were fabricated at room temperature starting with a mixture of diatomaceous earth (DE), lime, and water. The cementing phase, associated with the pozzolanic reaction of the diatom skeletons with lime, was identified as calcium silicate hydrate (C–S–H) gel using X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR). The FTIR and NMR results revealed that the C–S–H gel is mainly composed of silica dreierketten in all lime pastes using three different types of DE.
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