The influence of constituents on the properties of the bio-aggregate composite hemp-lime

Williams, Joseph; Lawrence, Michael B.; Walker, Pete

doi:10.1016/j.conbuildmat.2017.10.109

Cited by 35 publications

(40 citation statements)

References 18 publications

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“…Strawcrete, the straw fiber in this study, was used in its natural morphology to determine the effect of mixing sequence on the strength properties of the developed bio-aggregate. Furthermore, Joseph Williams stated that loading orientation does not depend on fiber size [15]. The fiber size distribution ranges from 5 mm to 50 mm as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the binder added with 10%-25% Portland cement can improve the compressive strength of hempcrete and increase its density [13]. Previous studies have focused on enhancing the mechanical properties of hempcrete by selecting the raw materials, percentage, and types of binders; furthermore, the importance of the applied tamping effort and particle size distribution of bio-aggregates has been highlighted [15]. Thus, hempcrete has paved the way for the utilization of agro-fiber in the construction industry.…”

Section: Introductionmentioning

confidence: 99%

“…Discussion about the importance of mixing sequence and its influence on strength characteristics of bio-aggregate base concretes is few [9]. In this context, some authors suggested to preliminary blend water and binder in a pan mixer to produce a homogenous slurry; afterward, the bio-aggregate was added and further mixed until full uniformity was reached [15]. Other authors proposed a mix by pre-wetting the bio-aggregates, and lime-based binder was added subsequently [16].…”

Section: Introductionmentioning

confidence: 99%

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Structural Characteristics of Developed Sustainable Lime-Straw Composite

2019

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Construction materials made of renewable resources have promising potential given their low cost, availability, and environmental friendliness. Although hemp fibers are the most extensively used fiber in the eco-friendly building sector, their unavailability hinders their application in Iraq. This study aimed to overcome the absence of hemp fiber in Iraq and develop a new sustainable construction material, strawcrete, by using wheat straw and traditional lime as the base binder. A comparable method of developing hempcrete was established. The experimental program adopted novel Mixing Sequence Techniques (MSTs), which depended on changing the sequence of mixed material with fixed proportions. The orientation of the applied load and the specimen’s aspect ratio were also studied. The mixing proportion was 4:1:1 (fiber/binder/water) by volume. Results showed that the developed strawcrete had a dry unit weight ranging from 645 kg/m3 to 734 kg/m3 and a compressive strength ranging from 1.8 MPa to 3.8 MPa. The enhanced physical and strength properties varied with the MST and loading orientation. The properties of the developed hempcrete were compared with those of strawcrete.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Characteristics of Developed Sustainable Lime-Straw Composite

2019

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“…Properties of the composite are influenced by many factors, including the proportion of binder to shives, type of binder, and degree of compaction. By reducing the binder content in the mixture, the thermal conductivity [1,2] of the composite and its compressive strength [1] decrease. The type of binder primarily affects mechanical properties [3,4] and setting process [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hemp Shives Size on Hygro-Thermal and Mechanical Properties of a Hemp-Lime Composite

et al. 2020

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Different fractions of hemp shives are used in the mixtures of the hemp–lime composite. The market offers shives of different granulation. It depends on the type of industrial hemp and on the capabilities of decortication machines. The aim of the research presented in the article is to check differences in the mechanical and hygro-thermal properties of composites with different shives fractions. The research part of the paper presents the preparation method and investigation on hemp–lime composites. Apparent density, total porosity, thermal conductivity, capillary uptake, vapor permeability, specific heat, mass absorptivity, flexural and compressive strength were examined. The results confirm that the shives fraction influences the individual properties of the composites. Hemp–lime composites with fine shives are characterized by higher water absorption, thermal conductivity, mechanical strength, vapor permeability as well as lower capillary-lifting capacity and specific heat than composites with thick shives.

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“…The results showed that the compressive strength varied from 0.15 to 0.20 MPa. Taking into consideration bending strength, according to literature [7,8], it varied from 0.20 to 0.32 MPa. However, no research on tensile strength of hemp and lime-based composites was conducted.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance of Biodegradable Thermoplastic Polymer-Based Biocomposite Boards from Hemp Shivs and Corn Starch for the Building Industry

et al. 2019

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Bio-sourced materials combined with a polymer matrix offer an interesting alternative to traditional building materials. To contribute to their wider acceptance and application, an investigation into the use of wood-polymer composite boards is presented. In this study, biocomposite boards (BcB) for the building industry are reported. BcB are fabricated using a dry incorporation method of corn starch (CS) and hemp shiv (HS) treatment with water at 100 °C. The amount of CS and the size of the HS fraction are evaluated by means of compressive bending and tensile strength, as well as microstructure. The results show that the rational amount of CS independently of HS fraction is 10 wt.%. The obtained BcB have compressive stress at 10% of deformation in the range of 2.4–3.0 MPa, bending of 4.4–6.3 MPa, and tensile strength of 0.23–0.45 MPa. Additionally, the microstructural analysis shows that 10 wt.% of CS forms a sufficient amount of contact zones that strengthen the final product.

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The influence of constituents on the properties of the bio-aggregate composite hemp-lime

Cited by 35 publications

References 18 publications

Structural Characteristics of Developed Sustainable Lime-Straw Composite

Structural Characteristics of Developed Sustainable Lime-Straw Composite

Influence of Hemp Shives Size on Hygro-Thermal and Mechanical Properties of a Hemp-Lime Composite

Mechanical Performance of Biodegradable Thermoplastic Polymer-Based Biocomposite Boards from Hemp Shivs and Corn Starch for the Building Industry

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