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Title: Development of an optimum pipeline renovation using Cured-In-Place Pipe (CIPP) techniques
Author: Razmara, Mohammad
ISNI:       0000 0004 2676 747X
Awarding Body: University of East London
Current Institution: University of East London
Date of Award: 2008
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A study has been performed to investigate resin cure and associated characteristics of composite used in CIPP technique (cured-in-place pipe). CIPP have been employed to rehabilitate deteriorated pipe line. Such liners are often subjected to external hydrostatic pressure which may eventually lead to creep or buckling of the liner within the host pipe. The main objectives of the research are: O To increase flexural modulus without adversely effecting the strength. O To improve the curing and thermo mechanical properties of resin-felt system. Numerous tests were performed on curing systems using DMA (Dynamic Mechanical Analyzer) technique to evaluate material cure and progression for various cataKst percentages. Gellation, vitrification, working open time and glass transition (Tg) were all assessed. A Time Temperature Transformation (TTT) profiles were proposed for three different systems of 2. 3 and 4% w/w catalyst (Figures 8.3. 8.4 and 8.6). indicating the various phases of cure progression (liquid / rubber / glassy and degradation) and further developed using DMA technique in penetration mode. The unique TTT profiles of unsaturated polyester resin in adjacent with nonwoven polyester felt developed to create the similar environment of CIPP production outside of the laboratory condition. In an attempt to enhance the physical and mechanical properties of the liner materials, many different additives were considered. However, it was found that silicon carbide (SiC) nanoparticles can potentially increase the flexural modulus and hardness of the liner materials. However due to the high cost of SiC. various amounts of crystalline SiC>2 (silica) and amorphous SiOo (rice husk ash, RHA) were used to achieve the most optimum mechanical properties. To improve the interfacial interaction between matrix and reinforcement, a suitable coupling agent was used. In the process, Differential Scanning Calorimetric (DSC) was used to evaluate the exothermic behaviour of the samples, scanning electron microscopy (SEM) was used to appraise the mechanism of failure. Thermogravimetry anahsis (TGA) was applied to measure the amount of volatility in the materials. The mechanical performance of all the samples was evaluated using flexural. microhardness, tensile, ring stiffness and creep-recovery tests. Additionally creeprecovery test yielded useful results on the shrinkage of different composite samples containing silica, SiC and RHA. It emerged that by using 8-10% w/w Silica treated by coupling agent resulted in the most cost effective solution, yielding a 30% improvement in flexural modulus of the liner material, this was found to be due to a stronger matrix-reinforcement interfacial interaction. Furthermore, thermo-mechanical properties of different polymer pipe materials used in pipe renovation, including MDPE. HOPE, U-PVC. M-PVC and PUR, were evaluated using DMA. The results of this study indicated that a developed CIPP liner made from polyester felt impregnated with unsaturated polyester resin, containing 10% SiC>2 additive (coupling agent treated) yielded the optimum mechanical performance, with a storage modulus of 1876 MPa, which is noticeably higher than that of different modern pipe materials on the market (PUR. MDPE, HOPE. PVC-U, PVC-M). This improvement in the results has been attributed to the development of optimum interfacial bond strength between silica, matrix and felt. Also this optimum formulation showed excellent toughness performance. The investigation into the thermo-mechanical properties of the optimised CIPP (UPE/F10%SP+CA samples), shows that the developed CIPP has been achieved the best performance in pipeline application.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available