Evaluation of the green coconut fiber compatibility with cement by using different calculation methods

Abstract

Using all the different methods reported in the literature, the compatibility of coconut green fiber with Portland cement in five different compounds was evaluated. For each trace, the mixtures hydration curves (temperature x time) were obtained by the use of type K thermocouples and an analog signal receiver. Based on a unique set of experiments with coconut fiber, a comprehensive critical review of the methods reported in the literature was performed to evaluate fiber-cement compatibility. Contradictory results about compatibility classification were obtained using different compatibility equations. The correlations between compatibility and compressive-strength essays results were considered to support our choice of the best method of compatibility calculation. Greater sensitivity to capture the differences in the compositions of mixtures and a higher correlation with the compressive strength of composites revealed that the CX calculation method, which considers the heat release rate as a basic parameter, presented more realistic results.

Effect of Recycled Rubber Powder on the Compatibility of Rubber-Cement Paste

“…Indeed, these increases were about (47.37%, 63.16%, 84.21%) respectively. According to the classification developed by various researchers [9,11,12] based on the inhibitory index, we note that RCWP10% mix has an intermediate incompatibility and the other mixes (RCWP20%, RCWP30%) have very high incompatibility. These results reveal that rubber powder with cement paste higher than 10% strongly inhibited their hydration reaction.…”

“…The compatibility levels of rubber-cement and pure cement pastes were assessed using the four criteria shown in Table 3. The criteria established by many researchers [11][12][13][14][18][19][20] to assess the compatibility of cement mixes were: maximum hydration temperature Tmax, setting time t, Aptness (A) as in Eq. ( 1), time ratio index (tR) as in Eq.…”

“…The inhibition characterized by a lower hydration temperature and an extended setting time [8][9][10]. In the literature, the compatibility of Portland cement with other materials has been evaluated by the hydration test [11][12][13]. The main criteria proposed by most researchers to evaluate the compatibility of cement binder were: the maximum hydration temperature and their corresponding setting time [11][12][13].…”

Efeito do reforço multi-escala fibra de celulose-microcelulose cristalina na fase de hidratação de pastas de cimento Portland

“…Muitas pesquisas indicam que as fibras de celulose podem interferir no processo de hidratação de compósitos a base de aglomerantes minerais, no qual um atraso no tempo de pega e redução da temperatura de hidratação podem acontecer [10,[13][14][15][16][17][18][19][20][21]. Isso ocorre devido à presença de açúcares solúveis em água resultar em uma hidrólise alcalina da lignina e solubilização parcial de hemicelulose contida nessas fibras [22].…”