Abstract:Hygrothermal behavior of a new building material, composed of cement, sand and date palm fibers was investigated in the present work. In a first part, the sorption-desorption isotherm behavior and the hysteresis effect was characterized under static conditions, revealing the high hydric capacity of this Date Palm Cement (DPC) mortar. In addition, the application of GAB model (Guggenheim-Anderson-de Boer) successfully described the experimental sorption isotherm curve. In a second step, the moisture buffer valu… Show more
“…Thus, the encouraging results documenting high water vapor permeability of these materials can be from the point of view of possible water evaporation from damp laden masonry recommended for restoration projects. Similar results of water vapor transmission properties measured, e.g., Silva et al [91] who analyzed the influence of natural hydraulic lime content on the properties of aerial lime-based mortars. For lime-based mortar, the authors obtained porosity of approximately 26% and δ = 1.47 × 10 −11 s, for mortars made of lime and NHL blends, δ = 1.49–1.38 × 10 −11 s. Accordingly, Bianco at al.…”
In this paper, crushed lava granulate was used as full silica sand replacement in composition of repair mortars based on hydrated lime, natural hydraulic lime, or cement-lime binder. Lava granules were analyzed by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Particle size distribution of both silica and lava aggregates was assessed using standard sieve analysis. Hygrothermal function of the developed lightweight materials was characterized by the measurement of complete set of hygric, thermal, and structural parameters of the hardened mortar samples that were tested for both 28 days and 90 days cured specimens. As the repair mortars must also meet requirements on mechanical performance, their compressive strength, flexural strength, and dynamic Young’s modulus were tested. The newly developed mortars composed of lava aggregate and hydrated lime or natural hydraulic lime met technical, functional, compatibility, and performance criteria on masonry and rendering materials, and were found well applicable for repair of historically valuable buildings.
“…Thus, the encouraging results documenting high water vapor permeability of these materials can be from the point of view of possible water evaporation from damp laden masonry recommended for restoration projects. Similar results of water vapor transmission properties measured, e.g., Silva et al [91] who analyzed the influence of natural hydraulic lime content on the properties of aerial lime-based mortars. For lime-based mortar, the authors obtained porosity of approximately 26% and δ = 1.47 × 10 −11 s, for mortars made of lime and NHL blends, δ = 1.49–1.38 × 10 −11 s. Accordingly, Bianco at al.…”
In this paper, crushed lava granulate was used as full silica sand replacement in composition of repair mortars based on hydrated lime, natural hydraulic lime, or cement-lime binder. Lava granules were analyzed by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Particle size distribution of both silica and lava aggregates was assessed using standard sieve analysis. Hygrothermal function of the developed lightweight materials was characterized by the measurement of complete set of hygric, thermal, and structural parameters of the hardened mortar samples that were tested for both 28 days and 90 days cured specimens. As the repair mortars must also meet requirements on mechanical performance, their compressive strength, flexural strength, and dynamic Young’s modulus were tested. The newly developed mortars composed of lava aggregate and hydrated lime or natural hydraulic lime met technical, functional, compatibility, and performance criteria on masonry and rendering materials, and were found well applicable for repair of historically valuable buildings.
“…Moreover, palm fibres are among the weakest for use in composites. Tensile strength is 21–60 MPa, and the elastic modulus is 0.6 GPa, which is ten times worse than other natural fibres [ 91 , 97 ]. Data on ultimate stretching are not found in the open literature.…”
Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.
“…This bio-concrete formulation consisted of 62 wt% cement (CEM II/B-LL32.5R CE NF), 23 wt% sand (particle size 0–4 mm) and 15 wt % date palm fibres (mean diameter = 3 mm). A water to cement ratio W/C of 0.68 was chosen in accordance with previous works [[1], [2], [3], [4]]. Fig.…”
Section: Experimental Design Materials and Methodsmentioning
The present data article is concerned with the hygrothermal performance at the wall scale of a new bio-based building material including date palm fibres. A specific test setup allowed to measure temperature and relative humidity (RH) profiles at three different depths of the bio-based wall subjected to outdoor boundary conditions. Besides, a partial differential equations resolution software was then used to solve two mathematical models (i.e., Kunzel and Mendes models) describing heat and moisture transfer in porous building materials. Both experimental/simulated temperature and RH profiles are provided with this dataset article. The proposed experimental setup can be used for studying the hygrothermal performance of different kinds of bio-based building materials at wall scale, while experimental/numerical data can serve as reference values for the validation of mathematical models intended to describe heat and mass transfer.
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