“…Results reveal that flexural and compressive strengths decrease with FBA content due to the high porosity of the mixture. The resistance of the used CM is about 5 and 12 MPa, respectively, at the flexural and compressive tests wherein values are nearly like those obtained by Saghrouni et al and Mehrez et al Figure shows the load–displacement curves of the composites. The reference mortar presents a sudden rupture at 0.42 mm.…”
Earlier research
suggested using ash to substitute cement, whereas
other studies looked at the possibility of using plant-derived agricultural
wastes as fiber reinforcement in cement applications. This study offered
an environmentally friendly option to change traditional mortars by
replacing cement with fly bottom ash (FBA) waste at 10, 20, 30, and
40 wt %. Likewise, Arundo donax leaves
(ADL) were employed to reinforce the modified cement mortars at 0.4,
2, 5, and 7 wt %. X-ray diffraction analysis of used materials was
performed. The morphology of composites made with FBA and ADL was
investigated using scanning electron microscopy. Moreover, the density,
water uptake, thermal conductivity, energy gain, and carbon dioxide
(CO2) emissions of the prepared composites were discussed.
Their flexural strength, compressive strength, and displacement were
also compared. Results revealed that the addition of FBA in the mortar
matrix has a positive effect on decreasing the thermal conductivity
and lightness of the mortar. In addition, 20 wt % of cement replacement
by FBA guarantees simultaneously moderate mechanical properties, nearly
51% of energy gain, and 20% of total CO2 emission reduction.
In the same, adding ADL to the 20wt %FBA mortar reduced the thermal
conductivity and the lightness of the mortar. The 0.4 wt % ADL reinforcement
ensured 59% energy gain and 6% of total CO2 emission reduction.
A major amelioration was observed in the compressive strength (an
increase of 14%) and in the plasticity (an increase of 27%) of the
considered composite materials. In conclusion, using FBA as a cement
replacement with low ADL content inclusion results in a thermal-resistant
composite with reasonable durability and strength.
“…Results reveal that flexural and compressive strengths decrease with FBA content due to the high porosity of the mixture. The resistance of the used CM is about 5 and 12 MPa, respectively, at the flexural and compressive tests wherein values are nearly like those obtained by Saghrouni et al and Mehrez et al Figure shows the load–displacement curves of the composites. The reference mortar presents a sudden rupture at 0.42 mm.…”
Earlier research
suggested using ash to substitute cement, whereas
other studies looked at the possibility of using plant-derived agricultural
wastes as fiber reinforcement in cement applications. This study offered
an environmentally friendly option to change traditional mortars by
replacing cement with fly bottom ash (FBA) waste at 10, 20, 30, and
40 wt %. Likewise, Arundo donax leaves
(ADL) were employed to reinforce the modified cement mortars at 0.4,
2, 5, and 7 wt %. X-ray diffraction analysis of used materials was
performed. The morphology of composites made with FBA and ADL was
investigated using scanning electron microscopy. Moreover, the density,
water uptake, thermal conductivity, energy gain, and carbon dioxide
(CO2) emissions of the prepared composites were discussed.
Their flexural strength, compressive strength, and displacement were
also compared. Results revealed that the addition of FBA in the mortar
matrix has a positive effect on decreasing the thermal conductivity
and lightness of the mortar. In addition, 20 wt % of cement replacement
by FBA guarantees simultaneously moderate mechanical properties, nearly
51% of energy gain, and 20% of total CO2 emission reduction.
In the same, adding ADL to the 20wt %FBA mortar reduced the thermal
conductivity and the lightness of the mortar. The 0.4 wt % ADL reinforcement
ensured 59% energy gain and 6% of total CO2 emission reduction.
A major amelioration was observed in the compressive strength (an
increase of 14%) and in the plasticity (an increase of 27%) of the
considered composite materials. In conclusion, using FBA as a cement
replacement with low ADL content inclusion results in a thermal-resistant
composite with reasonable durability and strength.
“…To avoid adding heat to the box, the principle of the hot box method is to keep the temperature difference (T b –T a ) between the box (T b ) and the outside (T a ) less than 1°C. Once permanent regime is established, different temperatures (T h , T c , T a , and T b ) are recorded to be used in the thermal conductivity determination using the following equation 19,20 Figure 2.Principle of the apparatus for measuring the thermal conductivity.…”
Section: Methodsmentioning
confidence: 99%
“…21 The measurement technique is based on the analysis of the transient phenomena of a sample excited by an energy pulse. 20 To measure thermal diffusivity, the sample is placed in a box equipped with incandescent lamps of 1,000 W. 22 The change in temperature on the opposite side (non-irradiated side) as a function of time is recorded using an acquisition system. The thermal diffusivity value is obtained using the following equation 21 c.…”
A new bio-composite material appropriate for building thermal insulation is proposed. The hydrophilic, thermal, and mechanical properties of composites made with Posidonia-Oceanica leaves, are experimentally investigated. The effect of two different sizes of fibers (natural and crushed leaves) as well as the effect of the chemical treatment (1% sodium hydroxide) are studied. For this purpose, different parallelepipedic specimens of dimensions 270 × 270 × 30 mm3 (thermal properties tests) and 160 × 40 × 40 mm3 (mechanical properties tests) were prepared by varying densities of leaves (0, 5, 10, 15, 20, and 30% by volume). In comparison to the fiber size effect, the results reveal that fiber loading has a significant impact on the mechanical and thermal characteristics of composites. Alkali treatment can improve the compressive and flexural strength of bio-composites. The novel bio-composites have low thermal conductivity (0.09 W.m−1K−1 when 30% of reduced size Posidonia-Oceanica leaves were loaded into the reference mortar) and acceptable mechanical performances. Results also show (1) The addition of treated fiber improves the ductility of the material. (2) The fracture toughness is 75% greater than reference mortar. (3) The use of crushed fibers decreases the composite’s mechanical strengths. (4) The flexural strength decreases with the fibers content and increase after 1% sodium hydroxide treatment. It can be concluded that the proposed bio-composite can be employed as thermal insulation material.
“…In addition, the hydrophilic nature of plant particles leads to a notable decrease in physical, mechanical and thermal properties and eventually rotting due to fungi attack. However, for several decades, several authors have studied the feasibility of improving the thermal, mechanical and physical insulation properties of these composite materials through the use of various types of vegetable materials in aggregates and/or fiber forms including pineapple leaf, date palm, kenaf, Alfa, Diss…,etc, as sand and/or aggregates replacement in concrete and mortars to enhance several properties [13][14][15][16]. The results have shown that the specimens exhibited several potential applications such as acoustic and thermal insulation, fire resistance cladding, and the enhancement of flexural strengthening of composite while results in improvement of toughness energy.…”
This work describes in detail the experimental investigation of the physico-mechanical properties of nonstructural hemp concrete (usually used as insulating wall material) when the Air-lime based Tradial PF70 binder is partially replaced using Metakaolin. The objective is to reduce the amount of free Ca 2+ ions in the binder as these are responsible for the degradation of vegetables particles and can therefore induce a loss of mechanical performances. In order to assess the effectiveness of pozzolanic reaction, amounts of 0%, 10%, and 20% vol. of Air-lime binder were replaced by the Metakaolin material, while testing the mechanical properties of concrete specimens containing 200% and 300% of hemp particles. Through SEM and EDX analysis, a tight relationship has been found to exist between the Metakaolin content and physical-mechanical properties of specimen. The pozzolanic reaction consumes calcium hydroxide from binder to produce Hydrated Calcium Silicates (C-S-H) and in turn, this leads to a decrease in the pH-value of the pore solution which is the main factor responsible for hemp particle degradation.
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