Waste-based natural fiber reinforcement of adobe mixtures: Physical, mechanical, damage and durability performance assessment

Araya-Letelier, Gerardo; Gonzalez-Calderon, Héctor; Kunze, S.; Burbano-Garcia, C.; Reidel, U.; Sandoval, Cristián; Bas, Fernando

doi:10.1016/j.jclepro.2020.122806

Cited by 28 publications

(27 citation statements)

References 35 publications

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“…The latter is also consistent with previous works addressing the flexural strengths of earthen mixes incorporating small doses of polypropylene micro fibers [48,59], where these micro fibers, when well mixed and in reduced doses, did not significantly affect the mechanical strength properties. It is important to mention that the negligible effect of the incorporation of BPFs on the compressive and flexural strength results of the earthen mixes obtained in this study is consistent with the results obtained by Araya-Letelier et al [35]. Moreover, the compressive and flexural strength results obtained by this study were, overall, very similar to the values obtained by Araya-Letelier et al [35] (e.g., the average compressive strength results for earthen mix BPF-1.0 were 2.14 MPa in this study and 2.07 MPa in the study by Araya-Letelier et al [35]).…”

Section: Compressive and Flexural Strengthsupporting

confidence: 92%

“…It is important to mention that the negligible effect of the incorporation of BPFs on the compressive and flexural strength results of the earthen mixes obtained in this study is consistent with the results obtained by Araya-Letelier et al [35]. Moreover, the compressive and flexural strength results obtained by this study were, overall, very similar to the values obtained by Araya-Letelier et al [35] (e.g., the average compressive strength results for earthen mix BPF-1.0 were 2.14 MPa in this study and 2.07 MPa in the study by Araya-Letelier et al [35]). The latter can be used to validate a proper manual manufacturing process of the new samples of this study.…”

Section: Compressive and Flexural Strengthsupporting

confidence: 92%

“…mechanical properties. This was conducted to validate the manufacturing process employed to develop the new specimens in this study, by comparing the data with the compressive and flexural strength results of Araya-Letelier et al [35] and, in order to obtain reliable results of the newly evaluated properties of capillary water absorption, impact strength and abrasion resistance of the BPF-reinforced earthen mixes addressed in this study.…”

Section: Impact Strengthmentioning

confidence: 99%

“…In order to manufacture the earthen mixes of this study, the same clayey soil used by Araya-Letelier et al [35] was selected, whose particle diameter size distribution was determined by sieving and hydrometer analyses, following the standards ASTM D6913/D6913-17 [36] and ASTM D7928-17 [37], respectively. The resulting soil gradation curve is provided in Figure 2.…”

Section: Clayey Soilmentioning

confidence: 99%

“…Nevertheless, the use of these BPFs as fiber-reinforcement for non-synthetic construction materials has been included in very few studies, which have mainly been focused on the use of BPFs as reinforcement in soil remediation applications [13,29,30]. To the best of the authors' knowledge, although a large fraction of the human population still lives in earthen-based dwellings [31] that exhibit limitations, such as a low impact and abrasion resistance, among others [32][33][34], the recent paper by Araya-Letelier et al [35] is the only study addressing the use of these BPFs as fiber- The goals of this paper are to assess the influence of increasing doses of BPFs on earthen mixes (also considering an unreinforced earthen mix used as a control mix), in order to produce a broad experimental evaluation of the durability, mechanical, and fracture properties of this new composite material for construction applications. Specifically, the following properties of earthen mixes are assessed: (i) Capillarity; (ii) compressive and flexural strength; (iii) impact strength (both at first crack and at collapse); and (iv) dry abrasion resistance.…”

Section: Introductionmentioning

confidence: 99%

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Biopolymer-Waste Fiber Reinforcement for Earthen Materials: Capillary, Mechanical, Impact, and Abrasion Performance

et al. 2020

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The poultry industry, highly prevalent worldwide, generates approximately 7.7 × 106 metric tons of chicken feathers (CFs), which become a major environmental challenge due to their disposal when considered waste or due to their energy transformation consumption when considered by-products. CFs are mainly composed of keratin (approximately 90%), which is one of the most important biopolymers whose inherent characteristics make CFs suitable as biopolymer fibers (BPFs). This paper first assesses the morphological and chemical characteristics of these BPFs, through scanning electron microscopy and energy dispersive X-ray spectroscopy, and then evaluates the waste valorization of these BPFs as a sustainable alternative for fiber-reinforcement of earthen mixes intended for earthen construction, such as adobe masonry, rammed earth, and earthen plasters. In particular, four earthen mixes with increasing doses of BPFs (i.e., 0%, 0.25%, 0.5%, and 1% of BPFs by weight of soil) were developed to evaluate the impact of BPF-reinforcement on the capillary, mechanical, impact, and abrasion performance of these earthen mixes. The addition of BPFs did not significantly affect the mechanical performance of earthen mixes, and their incorporation had a statistically significant positive effect on the impact performance and abrasion resistance of earthen mixes as the BPF dose increased. On the other hand, the addition of BPFs increased the capillary water absorption rate, possibly due to a detected increment in porosity, which might reduce the durability of water-exposed BPF-reinforced earthen mixes, but a statistically significant increment only occurred when the highest BPF dose was used (1%).

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