Study on flexible structure with waterproof, breathable and thermal insulation in concrete construction

with the development scale of urbanization construction in China, the technical standard of concrete construction is getting higher and higher. It is the key breakthrough direction of technology to strengthen waterproof and air permeability in concrete construction. Nonwoven formwork lining technology is a way to improve the impermeability of concrete structure surface to achieve the overall durability of concrete structure. Some hydrated residual water and large bubbles of concrete at a certain depth of surface layer are discharged, thus reducing the water-cement ratio of concrete, realizing the compactness of structural surface, increasing the strength and hardness of concrete surface, and achieving the purpose of improving the performance of surface concrete. This paper mainly analyzes the flexible structure of waterproof, breathable and heat preservation, and puts forward personal views and viewpoints.

Integrity Assessment of Internally Corroded Pipelines Rehabilitated With a Kevlar-Reinforced Flexible Liner

Contemporary approach of corrosion prevention is to use internal lining system to isolate the corrosive medium from the host pipe's inner surface. The liners serve to offer a longer lifecycle of pipelines, as well as a corrosion barrier against aggressive chemical agents. A recent lining technology based on a Kevlar-reinforced flexible polymer composite liner called the InField Liner (IFL) has been successfully installed in several pipelines. It has been theorized that the added inherent strength of the liner due to the Kevlar-reinforcement can give rise to an increase in burst pressure level of the corroded pipeline. The mechanical response of the IFL liner is established accurately and used to define the constitutive behavior of the IFL material in a nonlinear finite element model of liner installed in a host pipe with internal corrosion defect. The results reveal that an increase in burst pressure is achieved with the IFL liner, which is attributed to the interaction between the IFL and the internal corrosion defect. The increase in burst pressure is especially noted for rather deep and short length defects. The primary reason to the increase is the stretch of the Kevlar fabric into the defect cavity inducing a load transfer between the liner and pipe at the defect zone. A closed-form solution is developed, which can be used to assess the increase in burst of pipelines containing internal corrosion defects when rehabilitated with an IFL liner. The results of the study demonstrate that the IFL internal lining technology can be used as a corrosion barrier in steel pipelines for rehabilitation of old pipelines, as well as providing an increase in burst pressure level when the liner is installed due to its complex interaction with the internal corrosion defect.

Intensification of land reclamation production due to improvement of technologies of reconstruction and construction of irrigation canals

The article presents the modern problems of irrigation channels. The innovative material improving irrigation channels is offered. A comparative analysis of the benefits of concrete cloth in front of the concrete lining. Technology of using concrete fabric is described and mathematically justified. The described technology consists in the use of a concrete web. Comparative analysis of the costs of the channel with concrete and slabs. A mathematical evaluation of the efficiency of irrigation canals was carried out.

Australian-made technology renews Sydney's oldest sewers

Like all large cities around the world, Sydney's major underground sewers are deteriorating through age and reaching the end of their service life. To succeed in its vision to be the lifestream of Sydney for generations to come, Sydney Water's active sewer renewals program needs to renew underground sewers beneath heavily populated and environmentally sensitive areas. One of Sydney Water's pipeline rehabilitation contractors, Interflow, recently applied world class spiral wound lining technology to renew two of these sewers without excavation or interrupting services. This Australian made technology is pushing the boundaries in non-disruptive underground sewer renewal previously considered too difficult or impossible. The projects carried out for Sydney Water and discussed in this paper have twice received the International Society for Trenchless Technology's award for international project of the year.