Clay particles as binder for earth buildings materials: a fresh look into rheology of dense clay suspensions

Landrou, Gnanli; Brumaud, Coralie; Habert, Guillaume

doi:10.1051/epjconf/201714013010

Cited by 6 publications

(4 citation statements)

References 20 publications

(21 reference statements)

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“…At the present time, it is difficult to have a mix-design that allows for both fast casting and sufficient strength in the dry state. In order to address both problems and to improve mix-design of earth-based material, a recent trend has been to apply scientific knowledge and expertise developed by the concrete industry to earthen construction (Gnanli et al, 2014) [4,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

3D printing of earth-based materials: Processing aspects

Perrot

Rangeard

Courteille

2018

Construction and Building Materials

196

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Due to its low environmental impact, earth construction has received much consideration in recent years. Nevertheless, its development remains limited due to low production rate. Recent developments have been made to improve earth-based materials mixdesign and processing methods. Simultaneously, digitally based construction methods have been introduced in the field of construction especially for cement-based materials application. Among these new techniques, the so-called 3D printing by extrusion deposit has been the most intensively studied. In this study, we assess the possibility of adapting this technique to earth-based material. After making the earth's rheological behaviour suitable for 3D printing, a laboratory-scale printing has been carried out and the printed samples have been mechanically tested.

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Section: Introductionmentioning

confidence: 99%

3D printing of earth-based materials: Processing aspects

Perrot

Rangeard

Courteille

2018

Construction and Building Materials

196

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“…In the case of earth-based mortar, the content in clay makes a surface with a negative charge due to its cation exchange capacity, which can explain the best relative performance of cem+bio in comparison to earth+bio. However, the clay surface can have its surface interaction changed by adding some dispersants from the cement or ceramic industry [ 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Biomineralisation to Increase Earth Infrastructure Resilience

et al. 2022

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The vulnerability of buildings and structures to rain and flooding due to a lack of adaptive capacity is an issue all over the world. Exploring the bio-resources availability and engineering performance is crucial to increase infrastructure’s resilience. The current study analyses earth-based mortars using mineral precipitation as a biostabiliser (bio) and compares their performance with cement-based mortars. Cultures of S. oneidensis with a concentration of 2.3 × 108 cfu/mL were used to prepare earth-based and cement-based mortars with a ratio of 6% of binder. Microstructure analyses through SEM/EDS, water absorption, moisture buffering, mechanical strength, and porosity are discussed. The biostabiliser decreases water absorption in tidal-splash and saturated environments for earth and cement mortars due to calcium carbonate precipitation. The biostabiliser can prevent water migration more effectively for the cement-based (60% reduction) than for the earth-based mortars (up to 10% reduction) in the first 1 h of contact with water. In an adsorption/desorption environment, the conditions favour desorption in cem+bio, and it seems that the biostabiliser precipitation facilitates the release of the chemicals into the mobile phase. The precipitation in the earth+bio mortar porous media conditions favours the adsorption of water molecules, making the molecule adhere to the stationary phase and be separated from the other sample chemicals. The SEM/EDS performed for the mortars confirms the calcium carbonate precipitation and shows that there is a decrease in the quantity of Si and K if the biostabiliser is used in cement and earth-mortars. This decrease, associated with the ability of S. oneidensis to leach silica, is more impressive for earth+bio, which might be associated with a dissolution of silicate structures due to the presence of more water. For the tested earth-based mortars, there was an increase of 10% for compressive and flexural strength if the biostabiliser was added. For the cement-based mortars, the strength increase was almost double that of the plain one due to the clay surface negative charge in the earth-based compositions.

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“…The development of low-carbon construction processes promotes the use of earth-based building materials [1][2][3][4][5][6]. Earth-based building materials can be described as natural concrete, composed of aggregates, such as sand or gravel, and a binder, clay minerals [7,8]. To be used in a more standardized way, industries and researchers are interested in stabilizing earth-based building materials to increase their mechanical strength and durability [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Strengthening mechanisms of clay building materials by starch

Tourtelot,

d'Espinose de Lacaillerie,

Duc

et al. 2023

Construction and Building Materials

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Clay particles as binder for earth buildings materials: a fresh look into rheology of dense clay suspensions

Cited by 6 publications

References 20 publications

3D printing of earth-based materials: Processing aspects

3D printing of earth-based materials: Processing aspects

Biomineralisation to Increase Earth Infrastructure Resilience

Strengthening mechanisms of clay building materials by starch

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