REPAIR AND STRENGTHENING OF THE PIERS MODEL BY USING DIFFERENT TYPES OF INJECTED MATERIALS

Abstract

The water structures are difficult engineering structures and very sensitive to cracks inside or out side the body of it furthermore all its components need continuous check. The new one needs big amount of budget if be built, at the same time the keeping on the existing structure can serve a lot of money and many benefits at the construction time. The most important components for the water structures are the raft and the piers, and all can be repaired by injection. The principal aim to fill of the voids that leads to improve the strength of the structure body and permeability especially for water structures. The water structure is important structures need continuous check for all members to be at good efficiency to do the demand job which required. There are two important variables effect on the condition of the water structure with high quality, the structure stability and permeability, to keep all the elements of structure at the high quality mean repair and strengthening all of them continuously. The injection method in present time became very important method especially for treatment permeability for water structures. In laboratory nine models with 1/8 percentage from the piers of barrages which was concerned in this study, with three grades from concrete (fcu=150-200-250 kg/cm2). Two cases of loading for the models, before loading and after loading. The study concluded the effect of injection on the two variables which were studied the compressive strength and void ratio of the model concrete. In compressive strength the best material is the French cement the conclusion was: 1-The ordinary cement (O.C), used as injected materials the compressive strength of the models concrete after injection increased by (70.79%-103.01%-77.43%) than the average compressive strength before injection respectively to the grade of concrete (fcu). 2- The French cement (F.C) (Vicalps type D) used as injected material: the compressive strength increased by (137.02%-120.53%-67.43%) than the average compressive strength before injection respectively to the grade of concrete. 3- The Epoxy Conbextra (PE .L.V) used as injected material: the compressive strength increased by (70.3%-104.47%-80.76%) than the average compressive strength before injection respectively to the grade of concrete. In void ratio, porosity and density: the best material for treating this state is Epoxy material.