Next Article in Journal
Carbon-Fiber Enriched Cement-Based Composites for Better Sustainability
Previous Article in Journal
Ex-Vivo Comparison of Torsional Stress on Nickel–Titanium Instruments Activated by Continuous Rotation or Adaptive Motion
Open AccessArticle

Nonconventional Ca(OH)2 Treatment of Bamboo for the Reinforcement of Cement Composites

1
Departament of Mechanical Engineering, CIPP-CIPEM Research Group, Universidad de los Andes, Bogotá 111711, Colombia
2
Facultad de Ciencias Naturales y Matemáticas, Universidad de Ibagué, Carrera 22 Calle 67, Ibagué 730002, Colombia
3
School of Energy, Construction and Environment, Built & Natural Environment Research Centre, Coventry University, Priory Street, Coventry CV15FB, UK
*
Author to whom correspondence should be addressed.
Materials 2020, 13(8), 1892; https://doi.org/10.3390/ma13081892
Received: 10 March 2020 / Revised: 9 April 2020 / Accepted: 15 April 2020 / Published: 17 April 2020
(This article belongs to the Section Construction and Building Materials)
This study compares the structural and morphological changes in Guadua angustifolia Kunth (GAK) fiber prepared in three different ways (chips, barkless and crushed) when non-conventional alkaline treatment is applied. Moreover, it shows the improvement of mechanical properties of cement composites reinforced with these treated fibers. The three different preparations of Guadua were treated with a saturated solution of calcium hydroxide (5%) at 125 °C and 1.25 kPa for 3 h to remove non-cellulosic compounds. Then, their chemical, morphological, and structural properties were examined. The fibers exhibiting the higher delignification rate were selected to prepare cement composite boards, whose mechanical properties were successively compared with those of composites reinforced with untreated G. angustifolia fibers. The water/cement ratios of the cement mixed with the Ca(OH)2-treated and the untreated fibers were, respectively, around 0.3 and 0.25. The flexural strength and toughness of the two composites were evaluated after 7, 28, and 90 days of curing. The calcium hydroxide treatment showed higher efficiency in removing non-cellulosic materials when performed on crushed bamboo; moreover, the mechanical properties of the composites reinforced with the treated fibers were higher than those mixed with the untreated ones. After 90 days of curing, the flexural strength increased by around 40% and the toughness became three times higher (p < 0.05). The mechanical improvement by the Ca(OH)2 treatment of G. angustifolia fibers demonstrates its potential for the fabrication of cement composites. View Full-Text
Keywords: alkali treatment; bamboo fibers; cement composites; flexural strength; physical properties; biomass for reinforcement alkali treatment; bamboo fibers; cement composites; flexural strength; physical properties; biomass for reinforcement
Show Figures

Figure 1

MDPI and ACS Style

Sanchez-Echeverri, L.A.; Medina-Perilla, J.A.; Ganjian, E. Nonconventional Ca(OH)2 Treatment of Bamboo for the Reinforcement of Cement Composites. Materials 2020, 13, 1892.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop