Search

Your search keyword '"Morel, J.C."' showing total 22 results
Start Over Author "Morel, J.C."
22 results on '"Morel, J.C."'

4. Biological Stabilisers in Earthen Construction: A Mechanistic Understanding of their Response to Water-Ingress

Author

Kulshreshtha, Y. (author), Vardon, P.J. (author), Du, Y. (author), Habert, G. (author), Vissac, A. (author), Morel, J.C. (author), van Loosdrecht, Mark C.M. (author), Mota, Nelson (author), Jonkers, H.M. (author), Kulshreshtha, Y. (author), Vardon, P.J. (author), Du, Y. (author), Habert, G. (author), Vissac, A. (author), Morel, J.C. (author), van Loosdrecht, Mark C.M. (author), Mota, Nelson (author), and Jonkers, H.M. (author)

Abstract

Earthen construction is re-gaining popularity as an ecological and economical alternative to contemporary building materials. While building with earth offers several benefits, its performance due to water ingress is a concern for its widespread application. This limitation is often solved by adding chemical stabilisers such as Portland cement and hydraulic lime. Chemical stabilisers are a subject of widespread debate as they increase the cost and embodied energy of the structure, and reduce the desirable characteristics of raw or unstabilised earth. This along with perceived environmental performance, renewability, and proven effectiveness in traditional earthen construction has led to a growing interest in biological or organic stabilisers. Although the strengthening mechanism of biological stabilisers is widely covered in scientific studies, discussion regarding the water-resistance is limited. This review aggregates the research from the field of earthen construction and geotechnical engineering and extends it to explain the possible mechanism responsible for the water-resistance behaviour of biologically stabilised earthen materials. This study includes a wide range of traditional and industrial biological stabilisers derived from animals (cow-dung, casein, chitosan), plants (starch, guar gum, cactus mucilage, lignin, tannin) seaweeds (alginate, agar, carrageen) and microbes (xanthan gum, gellan gum). A conceptual model of water-ingress in unstabilised earthen blocks is proposed and the response of biological stabiliser to water ingress and related physico-chemical and physical factors is discussed using the model at microscale (stabiliser interaction with clay, sand) and macroscale (hydraulic conductivity of block). Properties of stabilisers such as hydrophobicity, stability under wet conditions or interaction with cations have a dominant effect on the overall response to water ingress. Key gaps have been identified in the existing knowledge that are necessary, Materials and Environment, Geo-engineering, BT/Environmental Biotechnology, Space & Type

Published
2022
Full Text
View/download PDF

7. Physical, mechanical and hygrothermal properties of lateritic building stones (LBS) from Burkina Faso

Author

Abhilash, H.N., McGregor, F., Millogo, Y., Fabbri, A., Sere, A.D., Aubert, J.E., and Morel, J.C.

Subjects
Building materials -- Mechanical properties -- Thermal properties -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT Earth is a predominant eco-friendly construction material which provides a good occupational comfort consuming less energy. To improve the durability performance, stabilization is commonly adopted. However the additional costs [...]

Published
2016
Full Text
View/download PDF

13. Development of a direct tensile test for compacted earth blocks reinforced with natural fibers

Author

Mesbah, A., Morel, J.C., Walker, P., and Ghavami, Kh.

Subjects
Civil engineering -- Research, Engineering and manufacturing industries, Science and technology
Abstract

Many thousands of years after its development, unburnt earth block masonry continues to offer an environmentally sustainable and cost-effective alternative to other conventional wall building materials, such as concrete blocks and clay fired bricks, in both developing and developed countries. However, earth is a brittle building material with low tensile strength, and as a consequence tensile cracks in response to external actions or restrained shrinkage are often observed. Ductility and tensile strength may be improved by adding binders or natural fibers to the soil mixture. In this technical note, initial findings of an ongoing study of the tensile characteristics of compacted earth blocks reinforced with natural fibers is reported. The pre-and postcracking characteristics of compacted earth blocks in direct tension were determined using a test procedure developed for this work. DOI: 10.1061/(ASCE)0899-1561(2004)16:1(95) CE Database subject headings: Clays; Fiber reinforced materials; Tensile strength; Building materials; Blocks.

Published
2004

14. An earth block with a compressive strength higher than 45 MPa!

Author

Aubert, J.E., Fabbri, A., Morel, J.C., and Maillard, P.

Subjects
Earth construction -- Analysis, Building materials -- Analysis -- Properties -- Mechanical properties, Business, Construction and materials industries
Abstract

ABSTRACT This paper presents the results of a compressive strength test carried out on an extruded earth block of dimensions 40.7 x 13.6 x 4.8 ([cm.sup.3]). The failure of the [...]

Published
2013
Full Text
View/download PDF

15. A model to measure compressive strength of compressed earth blocks with the '3 points bending test'

Author

Morel, J.C. and Pkla, A.

Subjects
Building -- Research, Construction industry -- Research, Building materials -- Research, Business, Construction and materials industries, Research
Abstract

Abstract This article proposes a modelling of the `3 points bending test' on compressed earth blocks (CEB) which will give their compressive strength. This test is already used in situ [...]

Published
2002

16. Some observations about the paper 'Earth construction: Lessons from the past for future eco-efficient construction' by F. Pacheco-Torgal and S. Jalali

Author

Morel, J.C., Aubert, J.E., Millogo, Y., Hamard, E., and Fabbri, A.

Subjects
Soils -- Properties -- Materials, Earth construction -- Forecasts and trends -- Analysis, Market trend/market analysis, Business, Construction and materials industries
Abstract

1. Introduction As the starting point of this discussion, we would like to congratulate the authors for this interesting review [1], which defends the use of earth as a building [...]

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results