Defects in concrete pavements of reclamation irrigation canals and methods of their repair

The operation of irrigation reclamation systems in the southern regions of the country with canals formed in the earthen body is accompanied by large losses of water for filtration. The value of moisture losses can reach up to 10 … 20% of the amount of water intake from a water source. Such an amount of seepage water can negatively affect the surrounding lands, causing flooding on them, the emergence of conditions for the emergence of swampy areas, salinization of territories, which ultimately leads to a decrease in soil fertility for growing plants. One of the ways to solve the problem of water filtration from canals is to build them with the formation of a protective concrete layer or to use concrete slabs. The study of the state of the existing reclamation canals shows the presence of various defects in their structures that have arisen in the process of long-term operation of the reclamation system. The main defects are: destruction of the connecting joints of concrete slabs; sliding of concrete slabs to the bottom of the canal; deformation of concrete structures, violating the design cross-section of the channel. In hydro-reclamation and hydraulic engineering, in the formation of critical loaded structures in the water environment, concretes with high strength and water tightness were mainly used, and these structures are still effectively functioning. It should be noted that on reclamation systems there are also structures that are less loaded, formed from concretes of lower strength, which have failed over time in the course of operation. The elements made of such concretes are the connecting joints of concrete slabs, areas of joints of the bases of concrete pavements, etc. Such films can be installed on the concrete or soil base of the bottom and slopes of canals.

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