Evaluate the influence of starch on earth/hemp or flax straws mixtures properties in presence of superplasticizer

Alhaik, Ghaith; Dubois, Vincent; Wirquin, Eric; Leblanc, Alexandre; Aouad, G.

doi:10.1016/j.conbuildmat.2018.07.209

Cited by 13 publications

(13 citation statements)

References 18 publications

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“…Some authors, e.g. Alhaik et al [36] and Perrot et al [33], have also employed superplasticizer intended for cement formulations in earthen materials.…”

Section: Organic Admixturesmentioning

confidence: 99%

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Effects of organic admixtures on the fresh and mechanical properties of earth-based plasters

Lagouin¹,

Laborel-Préneron²,

Magniont³

et al. 2021

Journal of Building Engineering

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“…Some authors, e.g. Alhaik et al [36] and Perrot et al [33], have also employed superplasticizer intended for cement formulations in earthen materials.…”

Section: Organic Admixturesmentioning

confidence: 99%

“…In the fresh state, the earth mortar is thus more flexible during application. During drying, the polysaccharide gel causes clay layers to stick together, strengthening the plaster properties [26], [36], [37].…”

Section: Organic Admixturesmentioning

confidence: 99%

Effects of organic admixtures on the fresh and mechanical properties of earth-based plasters

Lagouin¹,

Laborel-Préneron²,

Magniont³

et al. 2021

Journal of Building Engineering

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“…Moreover, a water/materials ratio of 20.5% by mass was selected. Biopolymers were added to the reference mix in different proportions, referring to the values reported in the literature [24,[55][56][57][58]. Accordingly, the celluloses and lignin were used at 10% by mass [of the construction earth], casein was used at 5%, while the other biopolymers (linseed oil, tannic acid, pectin, wheat starch, and sodium alginate) were used at 1%.…”

Section: Production Of Samplesmentioning

confidence: 99%

Influence of Biopolymers on the Mechanical Behavior of Earth-Based Building Materials

Tourtelot¹,

Bourgès²,

Keita³

2021

RPM

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Currently, the largest among the earth excavation sites in Europe are located in the Paris region. The soils excavated from these sites are often considered waste and are not valorized. With an increasing focus on sustainable development, the demand for low-carbon building materials is rising. Although construction using raw earth is a vernacular technique, the diversity in the behavior of the raw earth building materials warrants better control of their mechanical properties. The construction techniques differ depending on the location of the site, the composition of the earth, and the stabilizers used. Plant-based fibers and compounds extracted from plants are commonly used for reinforcing raw earth. Since such byproduct solutions have been developed worldwide, they differ significantly, and it becomes difficult to set a benchmark. The majority of the reported studies have directly used organic waste, rendering it difficult to characterize the material and extend the obtained results to other contexts. In order to reduce these variabilities, it becomes important to study the reinforcement of earth-based building materials with biopolymers that constitute the active molecules of the bio-based solutions. In the present study, different biopolymers derived from various vernacular techniques were utilized to increase the compressive strength of the construction soil collected from the Paris region. It was revealed that cellulose fibers and wheat starch increased the compressive strength of the earth from 3.5 MPa to 5.5 MPa and 4.5 MPa, respectively. In addition, the interactions of these biopolymers with clay were analyzed. The biopolymers identified as suitable for use in construction materials in the present study are widely available as wastes from paper, agricultural, or agro-food industries. These identified biopolymers would contribute to the development and standardization of construction using earth-based building materials.

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“…For wood chips or other small-sized bio-fillers, spraying with a geopolymer paste during bio-filler mixing is preferred to decrease adhesive substance consumption and ensure a smooth particle deposition [65]. The most common methods employed for starch-based bio-composite manufacturing are extrusion [66,67], injection molding, hot pressing [54,68], hot-pressing [67], compaction at load [55,69,70], and further curing at temperatures from 120 • C to 180 • C [48,53,69,71,72]. Compression molding is generally used for thermoplastic matrices [72].…”

Section: Specimen Manufacturementioning

confidence: 99%

Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment

et al. 2020

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To decrease the environmental impact of the construction industry, energy-efficient insulation materials with low embodied production energy are needed. Lime-hemp concrete is traditionally recognized as such a material; however, the drawbacks of this type of material are associated with low strength gain, high initial moisture content, and limited application. Therefore, this review article discusses alternatives to lime-hemp concrete that would achieve similar thermal properties with an equivalent or lower environmental impact. Binders such as gypsum, geopolymers, and starch are proposed as alternatives, due to their performance and low environmental impact, and available research is summarized and discussed in this paper. The summarized results show that low-density thermal insulation bio-composites with a density of 200–400 kg/m3 and thermal conductivity (λ) of 0.06–0.09 W/(m × K) can be obtained with gypsum and geopolymer binders. However, by using a starch binder it is possible to produce ecological building materials with a density of approximately 100 kg/m3 and thermal conductivity (λ) as low as 0.04 W/(m × K). In addition, a preliminary life cycle assessment was carried out to evaluate the environmental impact of reviewed bio-composites. The results indicate that such bio-composites have a low environmental impact, similar to lime-hemp concrete.

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Evaluate the influence of starch on earth/hemp or flax straws mixtures properties in presence of superplasticizer

Cited by 13 publications

References 18 publications

Effects of organic admixtures on the fresh and mechanical properties of earth-based plasters

Effects of organic admixtures on the fresh and mechanical properties of earth-based plasters

Influence of Biopolymers on the Mechanical Behavior of Earth-Based Building Materials

Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment

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