Road Maintenance Experience Using Polyurethane (PU) Foam Injection System and Geocrete Soil Stabilization as Ground Rehabilitation

Abstract

Abstract. There are many types of ground rehabilation and improvement that can be consider and implement in engineering construction works for soil improvement in order to prevent road profile deformation in later stage. However, when comes to road maintenance especially on operated expressways, not all method can be apply directly as it must comply to opreation's working window and lane closure basis. Key factors that considering ideal proposal for ground rehabilitation are time, cost, quality and most importantly practicality. It should provide long lifespan structure in order to reduce continuous cycle of maintenance. Thus, this paper will present two approaches for ground rehabilitation, namely Polyurethane (PU) Foam Injection System and Geocrete Soil Stabilization. The first approach is an injection system which consists two-parts chemical grout of Isocynate and Polyol when mixed together within soil structure through injection will polymerized with volume expansion. The strong expansion of grouting causes significant compression and compacting of the surrounding soil and subsequently improve ground properties and uplift sunken structure. The later is a cold in-place recyclying whereby mixture process that combines in-situ soil materials, cement, white powder (alkaline) additive and water to produce hard yet flexible and durable ground layer that act as solid foundation with improved bearing capacity. The improvement of the mechanical behaviour of soil through these two systems is investigated by an extensive testing programme which includes in-situ and laboratory test in determining properties such as strength, stiffness, compressibility, bearing capacity, differential settlement and etc.

Ground improvement using chemical methods: A review

“…With the injection of PU grout, the expansion of polyurethane grout displaces water and soil gets consolidated. Also, most of the stabilisation occurs within 15 min of application ( Fakhar and Asmaniza, 2016 ).…”

Soil Injection Technology Using an Expandable Polyurethane Resin: A Review

“…In 2016, Fakhar [97] conducted a laboratory experiment to compare the expandable polyurethane resin, used to compensate for an operational highway, and the geocrete method. Soil-resin cores were extracted from a highway after its injection by the resin.…”

Preparation of Castor-Based Polyurethane Composites Filled With Waste Carbon Tyres (Wct) as Grouting Material

“…This was because WCT acted as nucleation site for cellular formation that controlled the growth of cellular foams in CPUC matrix [16]. The uniform size and distribution of cellular foams in CPUC2 matrix contributed to the increment in cell's surface contact area resulting in improvement of compression strength of CPUC2 [9]. The increment of compression strength of CPUC2 was closely related to the increment of apparent density of composites [15].…”

“…One of the technology that can be used to dispose waste tyres is pyrolysis which gives waste carbon tyres (WCT) as the end product. WCT provides an alternative to commercial carbon black as reinforcing filler in various polymer fabrication [9]. The advantages of using WCT over commercial carbon black are reduction in compounding cost and minimizing the environmental concern regarding dumping of waste tyres [10].…”