Investigation of sealing materials for making watertight slab junctions and expansion joints of reinforced-concrete canal linings

1969 ◽  
Vol 3 (1) ◽  
pp. 27-34 ◽  
Author(s):  
B. F. Khasin
Keyword(s):  
Reinforced Concrete ◽  
Expansion Joints ◽  
Sealing Materials ◽  
Concrete Canal

scholarly journals Leakproofness of the reinforced concrete tank for water with a capacity of 45000 m3

2019 ◽  
Vol 284 ◽  
pp. 06006
Author(s):  
Y. Minch Maciej ◽  
Andrzej Kmita
Keyword(s):  
Reinforced Concrete ◽  
Technical Condition ◽  
Clean Water ◽  
Water Tank ◽  
Reinforced Concrete Structure ◽  
Expansion Joints ◽  
Total Capacity ◽  
Concrete Tank ◽  
Financial Losses ◽  
Level Analysis

The clean water tank discussed consists of four reinforced concrete tanks. The structure is symmetrical for each of the tank pairs, which consist of two storage tanks and two water transfer tanks for the water supply network. All chambers are technologically connected with each other. The tanks are partially recessed in the ground, monolithic, and completely roofed. The projection of chambers within external walls is 96 x 96 m = 9,216 m2. The total capacity of internal chambers and external chambers is about 45,000 m3. The clean water tank was made as a reinforced concrete structure, monolithic. The owner of the facility observed significant losses of stored water, which translated into large financial losses of the company. In order to determine the current technical condition of the reservoir and the causes of its leakage, a comprehensive, multi-level analysis was carried out in terms of strength, stability and durability of the structure. A few dozens of samples were taken at random, and the compressive strength of the concrete, modulus of longitudinal deformation and degree of carbonatization were evaluated. For the assessment of the technical condition of the expansion joints, boreholes were also drilled through them. On the basis of the results obtained from the tests, numerical analysis of the stress on the structure and its deformations was performed in order to select the most stressed areas as well as to assess expansion deformations as potential spots of the largest leaks. The results of the analysis were used to prepare the concept of sealing repairs of the tank chambers.

scholarly journals Evaluating the Effectiveness of Continuous Composite Beams for Steel-Concrete Bridges and Control Concrete Cracks of the Supports at an Early Age

2019 ◽  
Vol 97 ◽  
pp. 03007
Author(s):  
Trong-Chuc Nguyen ◽  
Trong-Phuoc Huynh ◽  
Nguyen-Trong Ho ◽  
Al-Amin Abdun Noor
Keyword(s):  
Reinforced Concrete ◽  
Composite Beams ◽  
Concrete Bridges ◽  
Early Age ◽  
Expansion Joints ◽  
Reinforced Concrete Slabs ◽  
Steel Girder Bridge ◽  
Girder Bridge ◽  
And Control ◽  
Composite Steel

This study presents a solution to contextualized span bridges constructed with composite steel girders with reinforced concrete slabs by reinforced concrete. This kind of structure, in comparison with a simple span, has many advantages as overcoming internal forces, reducing large displacements and cutting the number of expansion joints. Also, numerical simulations were conducted to evaluate the effectiveness of continuous composite beams for steel-concrete bridges and control of cracking of concrete at the supports at an early age. The models and conclusions in this paper can provide safety guidance for construct composite steel girder bridge in Vietnam.

scholarly journals Methods of on-site inspection of a reinforced concrete bridge exemplified by the bridge over the river Kosopasha

Vestnik MGSU ◽  
2020 ◽  
pp. 957-967
Author(s):  
Artem S. Piskun ◽  
Galina V. Ganets ◽  
Gleb A. Averchenko
Keyword(s):  
Reinforced Concrete ◽  
Leningrad Region ◽  
Shore Protection ◽  
Expansion Joints ◽  
Inspection Method ◽  
The Road ◽  
Reinforced Concrete Bridge ◽  
Bridge Abutment ◽  
Bridge Structures ◽  
On Site Inspection

Introduction. An on-site inspection method is a visual examination of an engineering structure aimed at the detection of defects, damages, and disturbances of a construction facility and further issuance of recommendations for their elimination. An on-site inspection method is among the principal ones applied, as it serves to identify all defects of bridge structures during their service lives. Materials and methods. The structures of the bridge over the Kosopasha river, located at the 5+910 km of the Pasha – Sviritsa – Zagubye motor road, the Volkhov District, Leningrad Region, were inspected. An on-site inspection method was applied to collect the information and perform the preliminary analysis. Results. The co-authors described the construction of the bridge elements, including the road deck topping, expansion joints, the safety parapet, sidewalks, hand rails, water insulation, the drain line, the bridge approach, the span, bridge support structures, piers, the bridge abutment, and the under-bridge area. They analyzed the condition of these elements at the time of their inspection; they compiled a report on defects, damages and the bridge deck capacity. The main defects include concrete leaching accompanied by concrete reinforcement denuding, concrete cracking and chipping, absence of safety parapet, partial destruction of rails, and failure of abutment strengthening constructions. Conclusions. Recommendations for the further operation of the bridge were formulated on the basis of inspection results. A set of measures is proposed with the purpose of eliminating the defects and further safe operation of the bridge structure. The recommendations include a set of repair works in respect of particular joints and constructions: removal of dust and dirt from the elements of the bridge topping and sidewalks, repair of minor damages of reinforced concrete structures, shore protection aimed at abutment reconstruction, installation of the safety parapet.

Optimizing the location of contraction-expansion joints in concrete canal lining

2009 ◽  
Vol 58 (1) ◽  
pp. 116-125 ◽  
Author(s):  
H. Ahmadi ◽  
H. Rahimi ◽  
J. Abdollahi
Keyword(s):  
Expansion Joints ◽  
Concrete Canal

Crack control for reinforced and prestressed concrete structures

1980 ◽  
Vol 7 (3) ◽  
pp. 466-476
Author(s):  
H. A. Falkner
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
Crack Width ◽  
Crack Formation ◽  
Concrete Structures ◽  
Expansion Joints ◽  
Crack Control ◽  
Total Length ◽  
Maximum Crack

The principal relationship between concrete and rebars when cracks form in reinforced concrete (RC) and prestressed concrete (PC) structures is presented. Mainly for better understanding, crack formation in concrete is compared with that of other materials such as wood or soil.Cracks in RC and PC structures are almost unavoidable and are more often caused by restraint forces than by loads. Cracks are harmless for serviceability and durability if crack width is limited to hair cracks up to 0.2 or 0.3 mm. Although it has been proved that cracks up to 0.4 mm wide do not increase corrosion of the embedded steel, engineers have to strive to limit crack width primarily to get a good appearance from concrete structures.References are given to completed RC and PC structures having a maximum crack width of less than 0.2 mm and structures without expansion joints up to a total length of 140 m.

Safety Evaluation of Reinforced Concrete Girder Bridge after Strengthened with Pasting Technology

2014 ◽  
Vol 919-921 ◽  
pp. 443-447
Author(s):  
Zhi Meng Zhao ◽  
Ke Da Liu ◽  
Jin Yi Chai ◽  
Le Le Lei ◽  
Qi Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Prestressed Concrete ◽  
Load Capacity ◽  
Safety Evaluation ◽  
Reinforced Concrete Beam ◽  
Concrete Bridges ◽  
Steel Plates ◽  
Expansion Joints ◽  
Girder Bridge

This paper examines the load capacity and safety of reinforced concrete beam bridge strengthened with pasting steel plates and carbon fiber polymer technology, taking the Longwanggou Bridge built in Jungar Qi in 1980s,a coal-rich area in Inner Mongolia, for example, in accordance with the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62-2004), and the Code for Design of Highway Bridge Strengthening (JTG /T J22-2008). The girders in superstructure of this bridge were strengthened by using pasting steel plate technology, while the capping beams of piers and abutments using combined technology of sticking steel plates and carbon fiber reinforcement polymer (CFRP). At the same time, the deck pavement and the expansion joints were replaced, with adjusting the continuous form of the bridge, to improve the integrity and its driving comfort. The results from the theoretical analysis and dynamic and static load tests on the bridge after strengthening have shown that it is safe and good in the integrity and reliable in the load capacity.

Damage of Industrial Reinforced Concrete Chimneys Caused by High Temperatures

2019 ◽  
Vol 808 ◽  
pp. 153-158
Author(s):  
Michal Pešata ◽  
Lukáš Procházka ◽  
Jana Boháčová ◽  
Jana Daňková
Keyword(s):  
Thermal Expansion ◽  
Reinforced Concrete ◽  
High Temperatures ◽  
Main Part ◽  
Expansion Joints ◽  
Exhaust Gases ◽  
Change Of State ◽  
Ethylene Unit ◽  
Concrete Reinforcement

The paper deals with the resistance of reinforced concrete against fire and the degradation of reinforced concrete due to high temperatures. In the first part the processes of degradation of concrete are solved due to the evaporation of water and its change of state with respect to the different thermal expansion of aggregates and concrete reinforcement members. The main part is focused on the construction of monolithic and prefabricated structures of industrial chimneys. The most common types of protection of the chimney's internal parts from the exhaust gases are discussed here. Also the possibilities of designing individual expansion joints are described. In the experiment, the problem of chimney damage, with the subsequent description of the chimney diagnostics in the premises of Unipetrol in Litvínov, was solved due to an extraordinary event - explosion of the ethylene unit.

Sign in / Sign up

Export Citation Format

Share Document