Polyurethane Floor Injection Systems

Polyurethane Ground Injection Systems Continuous population growth in developing countries has created the need to construct tall buildings, roads and bridges in coastal areas where soil types are weak. Construction of these structures requires suitable foundation soil, and soil improvement must be carried out before construction on such weak soil types [1]. Injection is one of the most popular geotechnical processes with strong empirical characteristics. It is widely used to isolate groundwater ingress and to strengthen soil and rock masses in situ in underground mining and underground space development [2]. Materials used for injection purposes can be classified into two general categories: cement suspensions and chemical solutions. Cement mortars are successfully used in granular soils with large voids or fractured rocks with wide crack openings. Chemical injections are used in soils with rock masses that have very small pore sizes or narrow joints, where cement suspensions cannot be injected or their penetration is very limited. Various chemical injection materials are used depending on the purpose of injection and the properties of the soil [3]. Among these, the most common are sodium silicate, lignin, polyurethane, acrylate, acrylic and epoxy resins [3-5]. Polyurethanes (PU) have found widespread use as joint filling materials in improving the structural properties of buildings due to their superior mechanical properties, excellent workability and sealing performance, excellent wear resistance and environmental tolerance [6]. Due to their low viscosity, short gelation time and high strength properties, polyurethanes are recommended as stabilizing injection fillers in ground applications [1]. Polyurethane ground injection products developed and manufactured at Flokser Kimya Research and Development Center are used in soil stabilization in areas such as metros and tunnels, construction sites, mines, dam bodies, reinforcement of soil and sandy gravel areas, filling of voids, repair of cracks and rapid waterproofing in areas with water leakage. Polyurethane injection materials, consisting of single and two-component products, can have rigid, semi-rigid and flexible structures. Polyurethane injection products developed for specific application areas and purposes provide fast and permanent solutions in ground injection systems with their superior technical properties.

Single-Component Polyurethane Injection Products:

Creanate Inject 53 is a single-component, solvent-free, low-viscosity polyurethane injection resin suitable for use in areas where waterproofing is required, filling and repair operations, crack area repairs and soil stabilization. Creanate Inject 53 resin is used together with Creacat Inject 53 catalyst. It reacts with water to transform into a porous-free, flexible and dense foam. Creainject 90 and Creainject 95 products are single-component, solvent-free polyurethane injection materials used in crack injection of concrete and paper structures in a wide variety of applications such as tunnels, highways, dam projects, concrete linings, underground galleries and foundations. The product reacts with water after injection to form a semi-rigid foam structure, ensuring complete filling of cracks and voids. Creainject 90 and Creainject 95 resins are used together with Creainject 90 Cat and Creainject 95 Cat catalysts.

Two-Component Polyurethane Injection Products

Creainject 400 and Creainject 500 are two-component, CFC and halogen-free, fast-reacting polyurethane ground injection products that provide waterproofing, particularly against pressurized water in areas carrying water. They are used to stop high-volume water leakage and to provide soil consolidation. Creainject 400 provides waterproofing in areas with 30% water leakage by weight, and Creainject 500 provides waterproofing in areas with 1% water leakage by weight. References 1. S. Saleh, N.Z.M. Yunus, K. Ahmad, N. Ali, Improving the strength of weak soil using polyurethane grouts: A review, Construction and Building Materials 202 (2019) 738–752. 2. W. Sui, J. Liu, W. Huc, J. Qi, K. Zhan, Experimental investigation on sealing efficiency of chemical grouting in rock fracture with flowing water, Tunnelling and Underground Space Technology 50 (2015) 239–249. 3. C.A. Anagnostopoulos, T. Papaliangas, S. Manolopoulou, T. Dimopoulos, Physical and mechanical properties of chemically grouted sand, Tunnelling and Underground Space Technology 26 (2011) 718–724. 4. G. Spagnoli, A review of soil improvement with non-conventional grouts, INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING 2021, VOL. 15, NO. 3, 273–287. 5. L. Faramarzi, A. Rasti, S.M. Abtahi, An experimental study of the effect of cement and chemical grouting on the improvement of the mechanical and hydraulic properties of alluvial formations, Construction and Building Materials 126 (2016) 32–43. 6. Z. Zhou . X. Du . S. Wang, Strength for Modified Polyurethane with Modified Sand, Geotech Geol Eng (2018) 36:1897–1906. Dr. Nesrin Oğuz Research and Development Specialist Flokser Kimya Dr. Canan Kızılkaya Research and Development Manager Flokser Kimya