By J Aguiar; Lech Czarnecki
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95-100. T. Bezerra. Composites Portland-biopolymer for well cementing. Doctorate thesis. UFRN, Brasil (2006). C. Nóbrega. Formulation of cementitious pastes based with addition of chitosan suspensions for well cementing. Doctorate thesis. UFRN, Brasil (2009). C. Aïtcin. Concreto de alto desempenho. 1 ed. São Paulo: Pini (2000).  Y. Ohama. Polymer-based admixtures. Cement and Concrete Composites, v. 20 (1998), p. 189212.  US Congress. Biopolymer. Making Materials Nature's Way. Office of Technology.
15. The workability of the mixtures should be equal. Therefore the flow table measurement was defined between 150 cm and 180 cm and adjusted by means of superplasticizer. Specimens were stored under various conditions: condition A storage under water condition B storage under normal climate (20 °C and 65 % relative humidity) condition C storage up to 7 days under water, then under normal climate Storage A improved the hydration of the cement. In terms of film formation storage B is the best. Storage C is a mix of both conditions and should improve a good cement hydration and a subsequent film formation.
Unhydrated cement particles are responsible for white areas. The epoxy-impregnated pores have a low backscatter intensity and appear as black spots. Figure 5: BSE image of unmodified cement mortar. The black lines are drawn manually to indicate distances of 20 µm from the surface of the sand particles. The slightly brighter zone (1) represents a zone with high Ca(OH)2 content. Where two aggregates come close to each other (2) a higher porosity (black spots) is observed. It is reported that the main differences from the bulk paste occur in the 20 µm zone .
Polymers in concrete by J Aguiar; Lech Czarnecki