Lignocellulosic Materials for Fiber Cement Production

Cheng

et al. 2020

BioRes

Portland cement-based composites were prepared with coffee exocarp (pretreated with water or NaOH) via vacuum extraction technology. An orthogonal test was adopted to analyze the influence of various factors on mechanical properties of the composite. The morphology and composition of the pretreated coffee exocarp and composites were analyzed via environmental scanning electron microscopy and X-ray diffraction, respectively. The results showed that the coffee exocarp content and vacuum extraction time significantly affected the compressive strength. An addition of 10% coffee exocarp had a slight negative effect on the mechanical properties but enhanced the crack inhibition and overall toughness of the composite. The scanning electron microscopy and X-ray diffraction results showed that the composite containing coffee exocarp pretreated with 4% NaOH solution had the highest density and exhibited the best properties due to mechanical interlocking between the coffee exocarp and cement. After 28 d of curing, the composites exhibited a maximum compressive strength of 15.72 MPa, a mass that was approximately 37% less than that of ordinary Portland cement samples, and a bulk density of 1.5 g/cm3 to 1.6 g/cm3. Hence, the produced biocomposites could be used for low-load pavements, providing a new type of economical building material.

Section: Effect Of the Coffee Exocarp Pretreatment On The Composite Materialsmentioning

confidence: 99%

Compressive strength and microstructure of modified coffee exocarp cement-based composites

Cheng

et al. 2020

BioRes

“…The bricks showed increased compressive strength after accelerated aging, except for the treatment added with 3.0% tire. For Milani and Freire (2006), this increase in strength shows the effect of soil stabilization with the mixture, which is linked to cement continued hydration during the wetting and drying cycles at accelerated aging (Taylor 1998;Teixeira et al 2020). Despite generating surface cracks in the matrix resulting in greater loss of mass (Table 11), it may have improved the reinforcement-matrix interaction increasing the mechanical resistance of bricks added with PET.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Soil-Cement Bricks Development Using Polymeric Waste

Metzker

Sabino

Mendes

et al. 2021

Preprint

Self Cite

This research aimed to evaluate the effect of adding different polymeric waste percentages and types on the physical, mechanical, thermal and durability properties of soil-cement bricks. Tire and PET (Polyethylene Terephthalate) waste were evaluated at 1.5 and 3.0% percentages. The soil was characterized in terms of shrinkage, compaction, consistency limits, particle size and chemical analyses, whereas the waste particles were submitted to morphological characterization. The bricks were produced in an automatic press with a 90: 10 (m/m) soil: cement ratio. The soil-cement bricks were characterized by density, moisture, water absorption, loss of mass by immersion, compressive strength, thermal conductivity and microstructural analysis. PET waste stood out for its use as reinforcement in soil-cement bricks. The best performance was obtained for bricks reinforced with 1.5% PET, which showed a significant compressive strength improvement, meeting the marketing standards criteria, even after the durability test, as well as obtaining the lowest thermal conductivity values. The percentage increase from 1.5% to 3.0% fostered a significant water absorption and loss of mass increase, as well as a significant compressive strength reduction of the bricks.

“…A variety of investigations of plant fibers with cements have been studied: rattan [ 14 ], bamboo [ 15 ], rice husk [ 16 ], sisal [ 17 , 18 , 19 ], coconut [ 20 , 21 , 22 , 23 , 24 , 25 , 26 ], sugar cane bagasse [ 27 , 28 , 29 ], babaçu [ 30 ], banana [ 31 , 32 ], coconut and abaca [ 33 ], oil palm [ 34 , 35 , 36 ], canary palm [ 37 ], arhar [ 38 ], agave lecheguilla [ 39 ], date palm [ 40 ], hemp [ 41 , 42 , 43 , 44 , 45 ], kenaf [ 46 ], giant reed [ 47 ], hazelnut shell, wood and tea [ 48 ], cork [ 49 ], jute [ 50 , 51 ] and corn [ 52 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Particleboards Made from Giant Reed (Arundo donax L.) Bonded with Cement and Potato Starch

et al. 2021

There is a general concern about the rationalization of resources and the management of waste. Plant residues can contribute to the development of new non-polluting construction materials. The objective of this study was to valorize a plant residue such as the giant reed and obtain a particleboard with cement using potato starch as a plasticizer in a manufacturing process involving compression and heat. The influence of cement and starch in different proportions and its stability over time were analyzed. Finally, their physical and mechanical properties were evaluated and compared to European Standards. High-quality sustainable particleboards (boards with high structural performance) were obtained and can be classified as P6 according to European Standards. Mechanical properties were improved by increasing the starch content and pressing time, whereas greater resistance to water was obtained by increasing the cement content. Giant reed particles seem to tolerate the alkalinity of the cement since there was no sign of degradation of its fibers. The use of these residues in the manufacture of construction materials offers a very attractive alternative in terms of price, technology and sustainability.