Mechanical behaviour of hypercompacted earth for building construction

Bruno, Agostino Walter; Gallipoli, Domenico; Perlot, Céline; Mendes, João

doi:10.1617/s11527-017-1027-5

Cited by 68 publications

(57 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bruno et al [12] show that the grain size distribution and the plasticity properties of the material used in this work satisfy the requirements for raw earth construction [13][14][15][16].…”

Section: Methodsmentioning

confidence: 99%

“…Thus, a small increase of dry density beyond the maximum value measured in this study could lead to a significant augmentation of compressive strength. Bruno et al [12] showed that the compressive strength of specimens compacted at a pressure of 100 MPa is already comparable with that of conventional masonry materials such as stabilised earth blocks and fired earth bricks.…”

Section: Figure 4 Variation Of Young Modulus With Dry Densitymentioning

confidence: 98%

“…Also, eight longitudinal fine grooves were cut along the lateral surfaces of the two pistons to create a preferential path for drainage at the interface between the outer surface of the pistons and the inner surface of the mould. More details about this compaction technique are available in Bruno et al [12]. After compaction, specimens were cut down to a height of 100 mm by trimming the excess soil from the top and bottom extremities.…”

Section: Compaction Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Effect of very high compaction pressures on the physical and mechanical properties of earthen materials

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. The paper compares the effect of different compaction procedures on the porosity and mechanical characteristics of earthen materials. In a first series of tests, a very high static pressure, up to 100 MPa, is applied to the soil for a sufficient period of time to allow consolidation (hyper-compaction). This method produces materials with very high densities up to 2300 kg/m 3 and good mechanical properties, which are suitable for the construction of masonry structures. In a second series of tests, the soil is compacted according to the standard Proctor method, which is the reference compaction procedure for the design of geotechnical fills such as dams and embankments. In the Proctor method, the soil is dynamically compressed by means of a much lower effort compared to hyper-compaction. All specimens are equalized under identical hygro-thermal conditions and subjected to unconfined compression tests to measure stiffness and strength. It is shown that hyper-compacted specimens exhibit physical and mechanical properties that are comparable with those of traditional building materials for masonry structures. Finally, mercury intrusion porosimetry tests are performed to study the effect of the compaction method on the pore structure of the material.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Figure 4 Variation Of Young Modulus With Dry Densitymentioning

confidence: 98%

Section: Compaction Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Effect of very high compaction pressures on the physical and mechanical properties of earthen materials

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is also interesting to note that the maximum density obtained for each type of tested forming process was in the same range (between 2050 and 2080 kg/m 3 ). Using higher energy of compaction would result in a higher density as proposed by [34]. to 2100 kg/m3.…”

Section: Iii2 Effect Of Processing and Dispersantmentioning

confidence: 99%

Strategies for optimizing the mechanical strengths of raw earth-based mortars

Perrot

Rangeard

Menasria

et al. 2018

Construction and Building Materials

View full text Add to dashboard Cite

Earth-based mortars are commonly reinforced with bio-based materials such as straw or biopolymers. The aim of this work is to identify reinforcements that are able to improve the mechanical strengths and the ductility of an earth-based matrix. We have also attempted to describe the mechanisms of reinforcement involved in such materials. Firstly, a kaolinite-based clay soil was mixed with sand to achieve earth-based mortars with the highest density at the dry state. For this material (kaolinite-based mortar), we have shown that, at the same water content, the compressive strength at the dry state only depends on the dry density of the sample whatever the forming process. Various quantities of fibers, fabrics and alginate were then used to reinforce the studied mortars (a kaolinite based mortar and a natural soil containing swelling clay sieved at 4 mm). We found that these reinforcements significantly increase the compressive strength of all tested samples containing kaolinite. A comparison between the two materials helps us to understand the reinforcement mechanisms for various fibers; it also demonstrates that natural fibers and woven fabrics enhance the mechanical behavior of earth mortars notably under a compressive load.

show abstract

“…Other authors have analysed the use of stabilized CEBs for affordable high-quality dwellings (Matta et al, 2015) or the addition of granitic soils to improve the mechanical properties of the units (Oliveira et al, 2016;Silva et al, 2015). Recent investigations on the behaviour of walls made using interlocking stabilized compressed earth blocks (ISCEBs) (Laursen et al, 2015;Qu et al, 2015 a,b) and the role of the compaction force (Bruno et al, 2017) have been carried out; in particular, the adoption of interlocking dry-stack blocks (Sturm et al, 2015) can simplify the execution phases. When this type of building exhibits box-type behaviour, the role of the out-of-plane behaviour must be evaluated in the seismic context (Qu et al, 2015 a,b;Andreini et al, 2013) or with regard to rocking phenomena in masonry walls (Giresini & Sassu, 2017;Giresini et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Production procedures and mechanical behaviour of interlocking stabilized compressed earth blocks (ISCEBs) manufactured using float ram 1.0 press

Sassu¹,

Romanazzi²,

Giresini³

et al. 2018

10.5267/j.esm

View full text Add to dashboard Cite

This paper illustrates an innovative manufacturing procedure for producing handcrafted interlocking stabilized compressed earth blocks (ISCEBs). A comparison of the mechanical properties of ISCEBs is conducted to assess the influence of varying components. The ISCEBs are manufactured by employing different block densities with three distinct mixtures (earth, earth and lime, earth and straw) and by using a human-powered machine named Float RAM 1.0 Press. The manual press was conceived for regions with limited access to technology and allows the production of interlocking blocks via two modes of compaction: mono-directional and bi-directional. A production average of approximately 30 blocks/hour corresponding to the work of three people is achieved. Three-point bending tests and uniaxial compression tests are carried out to investigate the ISCEB mechanical behaviour. The improvements obtained by incorporating additives into the subset of ISCEBs made from a pure earth mixture are tested. The aim of this work is to identify, for this specific technology, the relationship between production parameters and the consequent behaviour of different stabilization methods. A correlation is found between the compaction force and the compression strength of ISCEBs. The addition of lime increases strength and causes the blocks to exhibit a brittle behaviour. Moreover, the incorporation of straw fibres improves the tensile strength and ductility without significantly affecting the compression strength of the blocks. Energy-based parameters are obtained for all the tests, allowing the assessment of the ISCEB mechanical and dissipation properties.

show abstract

Mechanical behaviour of hypercompacted earth for building construction

Cited by 68 publications

References 20 publications

Effect of very high compaction pressures on the physical and mechanical properties of earthen materials

Effect of very high compaction pressures on the physical and mechanical properties of earthen materials

Strategies for optimizing the mechanical strengths of raw earth-based mortars

Production procedures and mechanical behaviour of interlocking stabilized compressed earth blocks (ISCEBs) manufactured using float ram 1.0 press

Contact Info

Product

Resources

About