Structure and properties of expanding polyurethane foam in the context of foundation remediation in expansive soil

Buzzi, Olivier; Fityus, Stephen; Sasaki, Yutaka; Sloan, Scott W.

doi:10.1016/j.mechmat.2008.07.002

Cited by 84 publications

(60 citation statements)

References 19 publications

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“…The resin penetrates into the terrain to be treated, increasing in volume and compressing the soil in all directionsradial expansion -favouring the pathways that offer the least resistance (Buzzi, Fityus, Sasaki & Sloan, 2008). The resin continues to expand until the soil prevents any further radial compression.…”

Section: Discussionmentioning

confidence: 99%

“…The "closed cell" structure of the expanded resin is shown in Figure 1. The images were obtained using an electron microscope (Buzzi, O., Fityus, S., Sasaki, Y., & Sloan, 2008) The images of Figure 1 shows the microscopic structure of the resin used by Uretek under free swell conditions corresponding to a density equal to 37 kg/m 3 . The density of the liquid mixture is equal to 1070 kg/m 3 , very close to that of water.…”

Section: Basic Concepts Of Expanding Polyurethane Resinmentioning

confidence: 99%

“…At that point, the only possibility for expansion is an upward displacement of the soil ( Figure 5). When this initial lifting is observed, it means that the consolidating action is being directed vertically upward and that this is the direction that offers the least resistance, while the surrounding soil offers greater resistance in respect of the decrease in the structural load, which means that the foundation soil has been compacted enough to withstand not only the increase in static loads, but also the loads created by the lifting (Bilotta, 2013) (Apuani et al, 2015) (Buzzi, O., Fityus, S., Sasaki, Y., & Sloan, 2008)(VINSON & Mitchell, 1972.…”

Section: Injection Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Underpinning of shallow foundations by expansive polyurethane resin injections. Case study: Cardinal Diego de Espinosa Palace in Segovia (Spain)

Sánchez

Serna

Lavín

et al. 2017

rdlc

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The injection of expansive polyurethane resin into the soil is a technology that is beginning to be used for underpinning shallow foundations. It is noteworthy that this technology has been used on buildings of great historical value which are part of the country's architectural heritage. This article describes the work done on the Cardinal Diego de Espinosa Palace which consisted of injecting expanding polyurethane resin into the soil at different depths (Uretek Deep Injections) in order to mitigate the differential settlements detected in the structure. This injection technology has proven to be more effective than the more convention methods used in the past which consisted of raising the foundation by building concrete shafts, which did not manage to mitigate the causes of the pathologies observed in the palace.Key words: Underpinning, Injection, Expansive Resins, Historical buildings. ResumenLa inyección en el terreno de resina de poliuretano expansivo es una tecnología que se está comenzando a utilizar en el recalce de las cimentaciones superficiales. En este sentido, resulta más enriquecedor llamar la atención sobre aquellas actuaciones realizadas que, por ser edificaciones con un valor histórico relevante, forman parte del patrimonio arquitectónico de un país. El presente artículo describe la actuación realizada en el edificio histórico del Palacio del Cardenal Diego de Espinosa, consistente en la inyección de resina de poliuretano expansivo en el terreno a diferentes profundidades (Uretek Deep Injections), encaminada a mitigar la presencia de asientos diferenciales detectados en su estructura. Esta tecnología de inyección ha mostrado ser más efectiva que las anteriores actuaciones de recalce convencionales realizadas, recrecidos de la cimentación mediante la construcción de pozos de hormigón, en las que no se consiguieron mitigar las causas de las patologías observadas en el palacio.

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Section: Discussionmentioning

confidence: 99%

Section: Basic Concepts Of Expanding Polyurethane Resinmentioning

confidence: 99%

Section: Injection Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Underpinning of shallow foundations by expansive polyurethane resin injections. Case study: Cardinal Diego de Espinosa Palace in Segovia (Spain)

Sánchez

Serna

Lavín

et al. 2017

rdlc

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“…Polyurethane resin (PUR) has many applications; therefore, various features of PU behaviour have been widely investigated since the 1960s (Buzzi et al, 2008). PU resin/foam is a complex and unique polymeric material with a wide range of physical and chemical properties; it comprises a chain of organic units joined by urethane links.…”

Section: Polyurethane Resinmentioning

confidence: 99%

Rapid remediation using polyurethane foam/resin grout in Malaysia

Bagus

2017

Geotechnical Research

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Consolidation and collapse settlements are common threats to existing highways and buildings around the world. With the emergence of various ground improvement technologies, lightweight materials are alternative solutions for filling embankment settlement, ground repair and resolving settlement issues of roadways and building structures. This alternative solution has become effective and rapid in terms of performance and time. In the polyurethane resin (PUR) injection method, the liquids, polyol and isocyanate, are injected in small drilled holes without the need for excavation. This method is fast and provides additional strength to the ground with reduction in the void ratio, hence reducing the compressibility of the soil. In fact, its lightweight and impermeable characteristics are advantageous to ground experiencing inundation and groundwater table fluctuation where it triggers the buoyancy effect. This paper presents the chemistry of PUR, the concept of PUR grouting, the properties of PUR and case studies conducted in Malaysia for rapid ground remediation.

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“…Erdemgil et al [8] found that the injected high polymer expanded drastically in the foundation, this reduces the voids of the soil and supports the loading with the soil, which increases the bearing capacity of the foundation. Buzzi and Fityus et al [9,10] used two kinds of grouting method to study the effect of high polymer on the surrounding soils and the properties of the high polymer materials. Yu et al [1] introduced the engineering example of high polymer grouting employed in the reinforcement of highway subgrade.…”

Section: Applications Of High Polymer Groutingmentioning

confidence: 99%

Application of polymer grouting reinforcement technology in the treatment of slope collapse

Zhang¹,

Liu²,

Ye³

2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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Abstract. Taking into considering of the difficulties and urgency in the treatment of geological hazards such as slope collapse, in light of the deficiencies in previous treatment methods, and also in view that the high polymer material, which has been widely used in geotechnical engineering, possesses the merits of high strength, light weight, high expansibility, short setting time, good durability, easy construction and is water-proof and harmless to the existing structures, the polymer grouting for the treatment of slope collapse is put forward innovatively. It is found that the polymer grouting can handle all kinds of unfavorable conditions in the treatment of slope collapse well. The slope deformation and stability before and after reinforcement with polymer grouting were studied by finite element method. The results indicates that the polymer grouting can deepen the slip circle and increase the sliding path, as a result, it avoids the shallow sliding mode of slope, which leads to the increase of stability and the decrease of slope deformation. After reinforcement, the factor of safety is increased by 35% and the maximum total displacement is reduced by 34.5%. Hence, the effectiveness of polymer grouting reinforcement technology is preliminarily verified.

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Structure and properties of expanding polyurethane foam in the context of foundation remediation in expansive soil

Cited by 84 publications

References 19 publications

Underpinning of shallow foundations by expansive polyurethane resin injections. Case study: Cardinal Diego de Espinosa Palace in Segovia (Spain)

Underpinning of shallow foundations by expansive polyurethane resin injections. Case study: Cardinal Diego de Espinosa Palace in Segovia (Spain)

Rapid remediation using polyurethane foam/resin grout in Malaysia

Application of polymer grouting reinforcement technology in the treatment of slope collapse

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