Abstract
The polymeric admixture sodium-carboxymethylcellulose (CMC-Na)/poly methyl allyl polyoxyethylene ether (PHPEG)/poly sodium p-styrene sulfonate (PSS) was synthesised and used in cement-based materials. The polymer was tested using Fourier-transform infrared spectroscopy and X-ray diffraction and the results showed that the superplasticiser was successfully synthesised. The polymer was applied to cement pastes, cement mortars and concretes. The results of thermogravimetric analysis and differential scanning calorimetry showed that the polymer promoted the cement hydration reaction. With the addition of the polymer, the compressive strength of the concrete increased by 42·17%, 21·94% and 20% at age 3 d, 7 d and 28 d, respectively, and the slump increased by 29 mm. Scanning electron microscopy was conducted to characterise the plain cement mortars and the polymer-modified cement mortars and the results revealed more hydration products in the polymer-modified cement mortars.
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