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A mild alkali treated jute fibre controlling the hydration behaviour of greener cement paste.

Jo BW, Chakraborty S - Sci Rep (2015)

Bottom Line: To reduce the antagonistic effect of jute fibre on the setting and hydration of jute reinforced cement, modified jute fibre reinforcement would be a unique approach.The present investigation deals with the effectiveness of mild alkali treated (0.5%) jute fibre on the setting and hydration behaviour of cement.Additionally, from the analytical characterizations, it is determined that fibre-cement compatibility is increased and hydration delaying effect is minimized by using alkali treated jute fibre as fibre reinforcement.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil and Environmental engineering, Hanyang University, Seoul, South Korea, 133791.

ABSTRACT
To reduce the antagonistic effect of jute fibre on the setting and hydration of jute reinforced cement, modified jute fibre reinforcement would be a unique approach. The present investigation deals with the effectiveness of mild alkali treated (0.5%) jute fibre on the setting and hydration behaviour of cement. Setting time measurement, hydration test and analytical characterizations of the hardened samples (viz., FTIR, XRD, DSC, TGA, and free lime estimation) were used to evaluate the effect of alkali treated jute fibre. From the hydration test, the time (t) required to reach maximum temperature for the hydration of control cement sample is estimated to be 860 min, whilst the time (t) is measured to be 1040 min for the hydration of a raw jute reinforced cement sample. However, the time (t) is estimated to be 1020 min for the hydration of an alkali treated jute reinforced cement sample. Additionally, from the analytical characterizations, it is determined that fibre-cement compatibility is increased and hydration delaying effect is minimized by using alkali treated jute fibre as fibre reinforcement. Based on the analyses, a model has been proposed to explain the setting and hydration behaviour of alkali treated jute fibre reinforced cement composite.

No MeSH data available.


Analysis of the control, raw jute, and alkali treated jute reinforced cement samples hydrated for 28 days.(a) X-ray diffraction pattern of hydrated samples, (b) fitted XRD peaks of the control sample, (c) FTIR spectra of hydrated samples, (d) fitted FTIR peaks of control sample, (e) DSC of hydrated samples, (f) variation in enthalpy change with increasing hydration time, (g) TG of the hydrated cement sample and (h) DTG of the same, and (i) variation in the estimated free lime content as a function of the hydration time.
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f2: Analysis of the control, raw jute, and alkali treated jute reinforced cement samples hydrated for 28 days.(a) X-ray diffraction pattern of hydrated samples, (b) fitted XRD peaks of the control sample, (c) FTIR spectra of hydrated samples, (d) fitted FTIR peaks of control sample, (e) DSC of hydrated samples, (f) variation in enthalpy change with increasing hydration time, (g) TG of the hydrated cement sample and (h) DTG of the same, and (i) variation in the estimated free lime content as a function of the hydration time.

Mentions: The X-ray diffraction patterns of the 28 days of hydrated control, raw jute, and alkali treated jute reinforced cement samples are shown in Fig. 2(a). The major components of Portland-pozzolana cement are alite (a) [tricalcium silicate C3S (Ca3SiO5)], belite (b) [dicalcium silicate C2S (Ca2SiO4)], tricalcium aluminate [C3A (Ca3Al2O6)], and tetracalcium aluminoferrite [C4AF (Ca4AlnFe2−nO7,)]2021. Additionally, it contains some amount of quartz (q) and gypsum (g) also. As represented in Fig. 2(a), the characteristic peak corresponding to the portlandite phase (p) appears at 2θ ~ 18°. In the X-ray diffractogram, the major reactant phase alite (a) is identified at 2θ ~ 29.4°. The integrated peak area ratio of the peaks corresponds to the portlandite (p) and the allite (a) phases and could therefore be treated as an index of the degree of hydration12. In this study, the X-ray diffraction patterns of the hydrated cement samples are fitted using commercial software (Peakfit 4.1, Jandel Scientific) to estimate the integrated peak area. Fig. 2(b) represents the fitted as well as deconvoluted XRD peaks of the control cement hydrated for 28 days. Chakraborty et al.12 reported the details of the fitting of the X-ray diffractogram.


A mild alkali treated jute fibre controlling the hydration behaviour of greener cement paste.

Jo BW, Chakraborty S - Sci Rep (2015)

Analysis of the control, raw jute, and alkali treated jute reinforced cement samples hydrated for 28 days.(a) X-ray diffraction pattern of hydrated samples, (b) fitted XRD peaks of the control sample, (c) FTIR spectra of hydrated samples, (d) fitted FTIR peaks of control sample, (e) DSC of hydrated samples, (f) variation in enthalpy change with increasing hydration time, (g) TG of the hydrated cement sample and (h) DTG of the same, and (i) variation in the estimated free lime content as a function of the hydration time.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4296306&req=5

f2: Analysis of the control, raw jute, and alkali treated jute reinforced cement samples hydrated for 28 days.(a) X-ray diffraction pattern of hydrated samples, (b) fitted XRD peaks of the control sample, (c) FTIR spectra of hydrated samples, (d) fitted FTIR peaks of control sample, (e) DSC of hydrated samples, (f) variation in enthalpy change with increasing hydration time, (g) TG of the hydrated cement sample and (h) DTG of the same, and (i) variation in the estimated free lime content as a function of the hydration time.
Mentions: The X-ray diffraction patterns of the 28 days of hydrated control, raw jute, and alkali treated jute reinforced cement samples are shown in Fig. 2(a). The major components of Portland-pozzolana cement are alite (a) [tricalcium silicate C3S (Ca3SiO5)], belite (b) [dicalcium silicate C2S (Ca2SiO4)], tricalcium aluminate [C3A (Ca3Al2O6)], and tetracalcium aluminoferrite [C4AF (Ca4AlnFe2−nO7,)]2021. Additionally, it contains some amount of quartz (q) and gypsum (g) also. As represented in Fig. 2(a), the characteristic peak corresponding to the portlandite phase (p) appears at 2θ ~ 18°. In the X-ray diffractogram, the major reactant phase alite (a) is identified at 2θ ~ 29.4°. The integrated peak area ratio of the peaks corresponds to the portlandite (p) and the allite (a) phases and could therefore be treated as an index of the degree of hydration12. In this study, the X-ray diffraction patterns of the hydrated cement samples are fitted using commercial software (Peakfit 4.1, Jandel Scientific) to estimate the integrated peak area. Fig. 2(b) represents the fitted as well as deconvoluted XRD peaks of the control cement hydrated for 28 days. Chakraborty et al.12 reported the details of the fitting of the X-ray diffractogram.

Bottom Line: To reduce the antagonistic effect of jute fibre on the setting and hydration of jute reinforced cement, modified jute fibre reinforcement would be a unique approach.The present investigation deals with the effectiveness of mild alkali treated (0.5%) jute fibre on the setting and hydration behaviour of cement.Additionally, from the analytical characterizations, it is determined that fibre-cement compatibility is increased and hydration delaying effect is minimized by using alkali treated jute fibre as fibre reinforcement.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil and Environmental engineering, Hanyang University, Seoul, South Korea, 133791.

ABSTRACT
To reduce the antagonistic effect of jute fibre on the setting and hydration of jute reinforced cement, modified jute fibre reinforcement would be a unique approach. The present investigation deals with the effectiveness of mild alkali treated (0.5%) jute fibre on the setting and hydration behaviour of cement. Setting time measurement, hydration test and analytical characterizations of the hardened samples (viz., FTIR, XRD, DSC, TGA, and free lime estimation) were used to evaluate the effect of alkali treated jute fibre. From the hydration test, the time (t) required to reach maximum temperature for the hydration of control cement sample is estimated to be 860 min, whilst the time (t) is measured to be 1040 min for the hydration of a raw jute reinforced cement sample. However, the time (t) is estimated to be 1020 min for the hydration of an alkali treated jute reinforced cement sample. Additionally, from the analytical characterizations, it is determined that fibre-cement compatibility is increased and hydration delaying effect is minimized by using alkali treated jute fibre as fibre reinforcement. Based on the analyses, a model has been proposed to explain the setting and hydration behaviour of alkali treated jute fibre reinforced cement composite.

No MeSH data available.