Influence of Water-Repellent Admixtures on the Water-Resistance of Unstabilized and Stabilized Compressed Earth Blocks
Keywords:compressed earth blocks, water-resistance, surface water-repellent, integral water-repellent, recycled aggregate, cement-stabilization.
The low durability of water action has been the main issue of earth construction since ancient times. In this way, sustainable solutions are needed to improve the earthen building materials water-resistance performance without significantly changing their appearance and eco-friendly nature. This study aims at characterizing the water-resistance of compressed earth blocks (CEB) produced with or without different types of colorless water-repellent admixtures. To this end, different types of unstabilized and 8% cement stabilized CEB were protected with two post-surface treatments, namely a silane-siloxane based surface water-repellent (SWR) and a natural linseed oil (LO), as well as one olein based integral water-repellent (IWR). Unprotected reference CEB were also considered for comparison purposes. More sustainable CEB were produced with 20% replacement of earth by recycling waste building materials. The CEB were tested in terms of compressive and flexural strength, capillary water absorption, immersion absorption, water permeability, low-pressure water absorption, and water erosion resistance from drip and spray tests. The influence of the moisture content on the compressive strength was also analysed. The cement-stabilization and water-repellent treatments were able to overcome the non-water-resistant nature of unstabilized CEB. In general, the best performance was attained with SWR, followed by IWR. The LO was less effective in reducing the long-term absorption but was able to protect unstabilized CEB from light rainfall simulated conditions. Under severe water erosion, the surface treatments were less effective, but water penetration was reduced up to near 40%. The mechanical strength, total porosity, water permeability and immersion absorption were not significantly affected by water-repellent products. Moreover, the mechanical strength reduction of stabilized CEB after saturation was about 30%, regardless of the water-repellent treatment. The main contribution of water-repellent admixtures occurred in all properties involving capillary absorption.
Damme HV, Houben H. Cement and Concrete Research Earth concrete. Stabilization revisited. Cem. Concr. Res. 2018; 114: 90–102. https://doi.org/10.1016/j.cemconres.2017.02.035
Assia Z, Fazia F, Abdelmadjid H. Sustainability of the stabilized earth blocs under chemicals attack ’ s effects and environmental conditions. Constr. Build. Mater. 2019; 212: 787–798. https://doi.org/10.1016/j.conbuildmat.2019.03.324
Cid-Falceto JC, Mazarron FR, Canãs I. Assessment of compressed earth blocksmade in Spain: International durability tests. Cons Build Mater 2012; 37: 738-745. https://doi.org/10.1016/j.conbuildmat.2012.08.019
Taallah B, Guettala A. The mechanical and physical properties of compressed earth block stabilized with lime and filled with untreated and alkali-treated date palm fibers. Cons Build Mater 2016; 104: 52–62. https://doi.org/10.1016/j.conbuildmat.2015.12.007
Rix C. Stabilization of a highly plastic clay soil for the production of compressed earth blocks. MSc Thesis, University of the Witwatersrand, 1998.
Riza F, Mujahid A, Zaidi A. A Brief Review of Compressed Stabilized Earth Brick. In International Conference on Science and Social Research (2010), IEEE, 2010.
Jayasinghe C, Fonseka WMJ, Abeygunawardhene YM. Load bearing properties of composite masonry constructed with recycled building demolition waste and cement stabilized rammed earth. Cons Build Mater 2016; 102: 471–477 https://doi.org/10.1016/j.conbuildmat.2015.10.136
Kerali AG. 2001. Durability of Compressed and CementStabilised Building Blocks. PhD thesis, University of Warwick, School of Engineering, 2001.
Morel JC, Pkla A, Walker P. 2007. Compressive strength testing of compressed earth blocks. Cons Build Mater 2007; 21: 303–309 https://doi.org/10.1016/j.conbuildmat.2005.08.021
Nagaraj HB, Sravan MV, Arun TG, Jagadish KS. Role of lime with cement in long-term strength of Compressed Stabilized Earth Blocks. Int J Journal of Sustainable Built Environment 2014; 3: 54–61 https://doi.org/10.1016/j.ijsbe.2014.03.001
Walker, PJ. 2004. Strength and erosion characteristics of earth blocks and earth block masonry. J Mater Civ Eng 2004; 16: 497-506 https://doi.org/10.1061/(ASCE)0899-1561(2004)16:5(497)
Holub M, Stone C, Balintova M, Grul R. Intrinsic Hydrophobicity of Rammed Earth. 2nd International Conference on Innovative Materials, Structures and Technologies. IOP Conf. Series: Materials Science and Engineering 96, 2015. https://doi.org/10.1088/1757-899X/96/1/012024
Humphrey Danso. Improving Water-resistance of Compressed Earth Blocks Enhanced with Different Natural Fibres. The Open Construction and Building Technology Journal 2017; 11: 433-440 https://doi.org/10.2174/1874836801711010433
Stazi F, Nacci A, Tittarelli F, Pasqualini E, Munafò P. An experimental study on earth plasters for earthen building protection: The effects of different admixtures and surface treatments. Journal of Cultural Heritage 2016; 17: 27–41. https://doi.org/10.1016/j.culher.2015.07.009
Bogas JA, Silva M, Gomes MG. Unstabilized and stabilized compressed earth blocks with partial incorporation of recycled aggregates. International Journal of Architectural Heritage, Conservation, Analysis and Restoration 2018; 13(4): 569– 584. https://doi.org/10.1080/15583058.2018.1442891
Alam I, Naseer A, Shah AA. 2015. Economical stabilization of clay for earth buildings construction in rainy and flood prone areas. Constr Build Mater 2015; 77: 154–159 https://doi.org/10.1016/j.conbuildmat.2014.12.046 60
Cañola HD, Builes-Jaramillo A, Medina CA, GonzálezCastañeda GE. Bloques de Tierra Comprimida (BTC) con aditivos bituminosos. TecnoLógicas 2018; 21(43): 135-45 https://doi.org/10.22430/22565337.1061
Kebao R, Kagi D. Integral admixtures and surface treatments for modern earth buildings. In book: Modern Earth Buildings, Chapter 10, Woodhead Publishing Limited, 2012. https://doi.org/10.1533/9780857096166.2.256
Adam E, Agib A. Compressed stabilised earth block manufacture in Sudan, United Nations Educational, Scientific and Cultural Organization, 2001.
Deboucha S, Hashim R. A review on bricks and stabilized compressed earth blocks, Scientific Research and Essays 2011; 6(3): 499-506
Miqueleiz L, Ramirez F, Oti JE, Seco A, Kinuthia JM, Oreja I, Urmeneta P. Alumina filler waste as clay replacement material for unfired brick production. Eng. Geol. 2013; 163: 68-74. https://doi.org/10.1016/j.enggeo.2013.05.006
Dawson A. Alternative and recycled materials for earth construction. In Modern Earth Buildings, Materials, Engineering, Constructions and Applications. A volume in Woodhead Publishing Series in Energy. Edited by M. Hall, R. Lindsay and M. Krayenhoff, 2012: 172-203. https://doi.org/10.1533/9780857096166.2.172
Taghiloha L. Using rammed earth mixed with recycled aggregate as a construction material. MSc thesis in Civil Engineering, Escola Técnica Superior d’Enginyeria de Camins, UPC-BarcelonaTech, 2013.
Mansour MB, Jelidi A, Cherif AS, Jabrallah SB. Optimizing thermal and mechanical performance of compressed earth blocks (CEB). Cons Build Mater 2016; 104: 44–51 https://doi.org/10.1016/j.conbuildmat.2015.12.024
Riza FV, Rahman IA. The properties of compressed earthbased (CEB) masonry blocks. In: Eco-Efficient Masonry Bricks and Blocks 2015; pp. 379-92. https://doi.org/10.1016/B978-1-78242-305-8.00017-6
Walker P. Strength, durability and shrinkage characteristics of cement stabilised soil blocks. Cem Concr Comp 1995; 17(4): 301–310. https://doi.org/10.1016/0958-9465(95)00019-9
Kinuthia JM. 2015. The durability of compressed earth-based masonry blocks. In: Eco-Efficient Masonry Bricks and Blocks 2015; pp. 393-421 https://doi.org/10.1016/B978-1-78242-305-8.00018-8
Medvey B, Dobszay G. Durability of Stabilized Earthen Constructions: A Review. Geotech Geol Eng 2020; 38: 2403– 25. https://doi.org/10.1007/s10706-020-01208-6
Zavoni EAH, Bernales JJB, Neumann JV, Mehta PK. Improving the moisure resistance of adobe structures, Materials and Structures 1988; 21: 213-21 https://doi.org/10.1007/BF02473058
Călătan G, Hegyi A, Dico C, Mircea C. Surface waterproofing methods of clay bricks used in vernacular construction. Section: 26. Green buildings technologies and materials. 14th International Multidisciplinary Scientific GeoConference SGEM 2014, 2014.
Mattone M. Intonaci in terra e gesso per la protezione delle costruzioni interra cruda. In: Congresos de arquitectura de tierra en Cuenca de Campos2010/2011. Construcción con tierra, Tecnología y Arquitectura, Universidad deValladolid, Cátedra Juan de Villanueva, Valladolid, 2011; pp. 315–22.
Akinyemi BA, Bamidele A, Oluwanifemi A. Influence of waterrepellent chemical additive and different curing regimes on dimensional stability and strength of earth bricks from termite moundclay. Heliyon 2019; 5(1). E01182 https://doi.org/10.1016/j.heliyon.2019.e01182
Luna MIBG. Consolidation of traditional plasters: a laboratoryresearch, in: 7th international conference of the study and conservation ofearthen architecture, Silves, Portugal, 1993; pp. 410–16.
Bahobail MA. The Mud Additives and Their Effect on Thermal Conductivity of Adobe Bricks. Journal of Engineering Sciences, Assiut University, 2012; 40(1): 21-34. https://doi.org/10.21608/jesaun.2012.112711
NP 143. Soils: determination of consistency limits (in portuguese). IPQ, Lisboa, 1969.
ASTM D698. Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf/ft3 (600 kN-m/m3)). ASTM International, USA, 2012.
Delgado MCJ, Cañas I. The selection of soils for unstabilised earth building: A normative review. Cons Build Mater 2007; 21(2): 237-51 https://doi.org/10.1016/j.conbuildmat.2005.08.006
Burroughs S. Soil Property Criteria for Rammed Earth Stabilization. Journal of Materials in Civil Engineering 2008; 20(3): 264–73 https://doi.org/10.1061/(ASCE)0899-1561(2008)20:3(264)
NZS 4298. Materials and Workmanship for Earth Buildings. Standards New Zealand, Wellington, 1998.
Bahar R, Benazzoug M, Kenai S. Performance of compacted cement-stabilised soil. Cem. Concr. Res 2004; 26: 811-20. https://doi.org/10.1016/j.cemconcomp.2004.01.003
Rigassi V. Compressed Earth Blocks : Manual of Production. CRAterre-EAG 1984, Vol. I, Eschborn, Germany, 1985.
Namango SS. Development of Cost-Effective Earthen Building Material for Housing Wall Construction : Investigations into the Properties of Compressed Earth Blocks Stabilized with Sisal Vegetable Fibres, Cassava Powder and Cement Compositions. PhD thesis, Brandenburg University of Technology (BTU) Cottbus, Senftenberg, Germany, 2006.
EN 772-13. Methods of test for masonry units - part 13: Determination of net and gross dry density of masonry units (except for natural stone), 2000.
NTC 5324. Ground Blocks Cement for Walls and Divisions. Definitions. Especifications. Test Methods. Conditions of delivery. ICONTEC, Bogotá, Colombia, 2004.
EN 772-6. Methods of test for masonry units - part 6: determination of bending tensile strength of aggregate concrete masonry units, 2001.
EN 772-11. Methods of test for masonry units - part 11: Determination of water absorption of aggregate concrete, manufactured stone and natural stone masonry units due to capillary action and the initial rate of water absorption of clay masonry units, 2011.
NBR 8492. Tijolo maciço de solo-cimento: determinação da resistência à compressão e da absorção de água de tijolos maciços de solo-cimento para alvenaria, (in portuguese). Brazilian Association of Technical Standards (ABNT), Brasil, 1986.
Rilem. Recommandations provisoires de lacommission 25- PEM, Protection et erosion des monuments Essais recommandés pour mesurer l’altération des pierres et évaluer l’efficacité desméthodes de traitement. In Reunion Internationale des Laboratoires D’Essais et de Recherches sur lesMateriaux et les Constructions (RILEM), Matériaux de Constructions, Paris, Vol. 13, No. 75, 1980. https://doi.org/10.1007/BF02473564
EN 16302. Conservation of cultural heritage. test methods. Measurement of water absorption by pipe method. CEN, Brussels, 2013.
Heathcote KA. An investigation into the erodibility of earth wall units. PhD thesis, University of Technology Sydney, Australia, 2002.
Aubert JE, Fabbri A, Morel JC, Maillard P. An earth block with a compressive strength higher than 45 MPa!. Construction and Building Materials 2013; 47: 366–9. https://doi.org/10.1016/j.conbuildmat.2013.05.068
Morel JC, Pkla A. A model to measure compressive strength of compressed earth blocks with the “3 points bending test”. Construction and Building Materials 2002; 16(5): 303–10. https://doi.org/10.1016/S0950-0618(02)00023-5
Delgado MCJ, Guerrero IC. Earth building in Spain. Construction and Building Materials 2006; 20(9): 679–90. https://doi.org/10.1016/j.conbuildmat.2005.02.006
Exelbirt J. Characterizing Compressed Earth Bricks Based on Hygrothermal Aging and Wind-Driven Rain Erosion. MSc Thesis , University of Florida, 2011.
Elenga RG, Mabiala B, Ahouet L, Goma-Maniongui J, Dirras GF. Characterization of Clayey Soils from Congo and Physical Properties of Their Compressed Earth Blocks Reinforced with Post-Consumer Plastic Wastes. Geomaterials 2011; 1: 88-94 https://doi.org/10.4236/gm.2011.13013