Textile-reinforced rammed earth: Experimental characterisation of flexural strength and thoughness

Bernat-Masó, Ernest; Escrig, Christian

doi:10.1016/j.conbuildmat.2015.12.139

Cited by 31 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, preliminary characterisation tests were performed to set these variables before producing the definitive specimens. A drop ball test, used in previous research (17), indicated that a water content level of 12.6% for the earthen material was suitable for the production of compacted specimens. The evolution of the moisture content along time was monitored in a preliminary campaign.…”

Section: Specimens Production and Curingmentioning

confidence: 94%

See 1 more Smart Citation

Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens

Bernat-Masó¹,

Gil²,

Escrig³

et al. 2018

Mater. construcc.

Self Cite

View full text Add to dashboard Cite

Microbial biodeposition of calcite induction for improving the performance of rammed earth is a research area that must be analysed in a representative environment. This analysis must consider the compaction force, particle size distribution and curing process as production variables. This paper investigates the effects of adding specific bacteria, Sporosarcina Pasteurii, into compressed earth cubes and the effect of production variables. Uniaxial compressive tests and direct shear tests have been conducted for 80 specimens. The results indicate that calcite precipitation interacts with the drying process of clay/silt resulting in reducing the compressive strength, the apparent cohesion and the friction angle. Finally, bacterial activity, which is more likely in samples cured in a high humidity environment, tends to reduce the dilatancy effect. RESUMEN: Efecto de la Sporosarcina Pasteurii en las propiedades resistentes de especímenes de tierra comprimida.Inducir la biodeposición microbiana de calcita para mejorar las prestaciones de la tapia es una línea de investigación que necesita ser analizada en condiciones representativas y teniendo en cuenta variables de producción como la fuerza de compactación, la granulometría o el curado a diferentes humedades. Se estudia el efecto de añadir Sporosarcina Pasteurii en cubos de tierra comprimida y la influencia de estas variables de producción. Se han realizado ensayos de compresión simple y corte directo sobre 80 especímenes producidos con dos niveles de compactación y dos granulometrías. Los resultados indican que la precipitación de calcita interactúa con el proceso de secado de los limos/arcillas dando como resultado una reducción de la resistencia a compresión, de la cohesión aparente y del ángulo de fricción. Finalmente, la actividad bacteriana, más probable en las muestras curadas en un entorno de alta humedad, tiende a reducir el efecto de la dilatancia.PALABRAS CLAVE: Carbonato cálcico; Material orgánico; Curado; Resistencia a la Compresión; Caracterización ORCID ID: E. Bernat-Masó

show abstract

Section: Specimens Production and Curingmentioning

confidence: 94%

“…The particle size distribution of these two mixtures is presented in Figure 1. Mixture A was used in previous research (17).…”

Section: Earthmentioning

confidence: 99%

Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens

Bernat-Masó¹,

Gil²,

Escrig³

et al. 2018

Mater. construcc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The methodology consisted in drying specimens at 105ºC for 24h and measuring the weight variation. The desirable moisture content of the mixture was set to 12.6% using the drop ball test like in a previous research [30].…”

Section: Materials Soil Mixturementioning

confidence: 99%

Ultrasound transmission method to assess raw earthen materials

Bernat-Masó

Teneva

Escrig

2017

Construction and Building Materials

Self Cite

View full text Add to dashboard Cite

© 2017. This version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/The feasibility of using ultrasound transmission method to assess raw earthen materials is investigated. Results indicate that this technique is effective at controlling the drying process of raw earthen materials. Near the hygrometric equilibrium, there is a linear relationship between the moisture content of the earthen material and the ultrasound transmission speed, which increases during the drying process. For the tested compressed earth, the hygrometric equilibrium is reached when the ultrasound transmission speed is over 1100 m/s. In addition, ultrasound transmission method is useful to reliably calculate the dynamic Young's modulus of raw earthen materials.Peer ReviewedPostprint (author's final draft

show abstract

“…Indoor environmental health is likewise an area of growing interest, e.g., [22]. Development of earth materials for contemporary buildings has therefore become a subject of intense investigation in diverse climates, including cool, rainy areas in which durability is a significant concern, e.g., [23][24][25][26][27][28][29][30]. Northern European countries, in particular, have aggressive greenhouse gas reduction targets that they hope to meet in part by reducing or replacing concrete and fired clay bricks in buildings, e.g., [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Frost Resilience of Stabilized Earth Building Materials

Rempel

2019

Geosciences

View full text Add to dashboard Cite

Earth-based building materials are increasingly valued in green design for their low embodied energy, humidity-buffering ability, and thermal stability. These materials perform well in warm dry climates, but greater understanding of long-term durability is needed for successful adoption in colder and/or wetter climates. The presence of stabilizers dramatically improves resistance to surface erosion from wind and rain, compared to unstabilized adobe and cob counterparts, and the influences of soil composition, fiber type, and diverse binders, on rain and wind surface erosion have been investigated in detail. Frost and freeze-thaw resistance, however, have been less well-studied, despite strong interest in stabilized earth materials in northern North America, Europe, and Asia. In particular, recent studies have relied on a widespread misunderstanding of the mechanism by which frost damage occurs in porous materials that will impede efforts to create valid models for material design and improvement. In addition, the influence of radiative thermal stresses on wall surfaces has been overlooked in favor of focus on ambient air temperatures. Here, we apply contemporary understanding of cracking by segregated ice growth to develop a macroscopic damage index that enables comparison between performance of different materials subject to different weather patterns. An examination of predicted damage patterns for two stabilized earth building materials and two conventional materials in twelve cities over two time periods reveals the dominant factors that govern frost vulnerability. We find that the frost resilience of earth building materials is comparable to that of the conventional materials we examined, and that assessments that neglect expected variations in water content by assuming full saturation are likely to yield misleading results. Over recent years, increased winter temperatures in several cities we examined predict reduced material vulnerability to frost damage, but we also find that accompanying increases in humidity levels have made some cities much more vulnerable.

show abstract

Textile-reinforced rammed earth: Experimental characterisation of flexural strength and thoughness

Cited by 31 publications

References 15 publications

Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens

Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens

Ultrasound transmission method to assess raw earthen materials

Frost Resilience of Stabilized Earth Building Materials

Contact Info

Product

Resources

About