scholarly journals About the main causes of cracks in-situ cement concrete pavements in joints

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Tatiana Levkovich ◽  
Zelgedin Mevlidinov ◽  
Nikita Fedin ◽  
Pavel Mirenkov
Keyword(s):  
Base Material ◽  
Road Construction ◽  
Cement Concrete ◽  
Transverse Cracks ◽  
Expansion Joints ◽  
Industrial Sites ◽  
Cement Concrete Pavement ◽  
Concrete Coating ◽  
Construction Organization ◽  
Made In

In recent years, the use of concrete (cement concrete) bases and coatings of roads and industrial sites has begun to revive in road construction. Employees of the Department of «roads» BGIT together with students for several years under surveillance for cracks in the monolithic cement concrete layers of coatings. The article presents the results of field surveys of cement concrete coatings of highways of the Bryansk region and industrial sites in order to identify the causes of cracks in the expansion joints. We have examined the sections of roads with cement concrete coating on some plates near the seam and found the formed transverse cracks. They were located mainly along the seam, the maximum opening width reached 5 mm. the Maximum distance from the seam 30 cm. Cracks along the seam were located unevenly and had a diverse shape. We have also calculated several variants of pavement with cement concrete coating on different bases. As a result of the survey were tested: the coefficient of compaction of the base material, the compressive strength of concrete in the coating plates, the technology of works on the device of coatings and expansion joints in them, as well as the control of the project materials submitted by the design organization, including the project of works. In conclusion, the following main causes of cracks in monolithic cement concrete coatings of roads and industrial sites can be identified: errors made in the calculation and design of the pavement structure; errors made in the calculation of the length of the plates, the appointment of reinforcing bars in the seams; errors in the construction of cement concrete pavement construction organization (if device transverse control joints and expansion joints in compression, buckling and longitudinal). The study material is generalized, road and construction organizations are given recommendations for the elimination of cracks, some measures to prevent their occurrence are indicated.

Analysis on the Global Warming Potential of Cement Concrete Pavement in China

2015 ◽  
Vol 814 ◽  
pp. 418-424
Author(s):  
Li Li Zhao ◽  
Zhi Hong Wang ◽  
Yu Liu ◽  
Xian Zheng Gong ◽  
Feng Gao ◽  
...  
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Road Construction ◽  
Concrete Pavement ◽  
Raw Material ◽  
Cement Concrete ◽  
Environment Impact ◽  
Cement Concrete Pavement ◽  
Materials Used ◽  
Total Impact

The global warming of cement concrete pavement from raw material extraction to road construction was analyzed by the method of life cycle assessment. The characterization results showed that the procedure of producing material is the most important stage to emit greenhouse gas and it accounts for 98.5% of the global warming potential that caused by the material production and construction stage. For the materials used in different structure layers, surface layer is the biggest impact of greenhouse and accounts for 68.9% of the total impact caused by material used in constructing pavement. Therefore in the future, by using recycled materials or more environmental materials will be a good way to reduce environment impact.

scholarly journals Designing of concrete pavement expansion joints based on climate conditions of Vietnam

2019 ◽  
Vol 28 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Hoang Long Nguyen ◽  
Cao Thang Pham ◽  
Duy Linh Pham ◽  
Tuan Anh Pham ◽  
Duc Phong Pham ◽  
...  
Keyword(s):  
Life Span ◽  
Weather Conditions ◽  
Concrete Pavement ◽  
Concrete Pavements ◽  
Cement Concrete ◽  
Expansion Joints ◽  
Climate Conditions ◽  
Cement Concrete Pavement

AbstractMain objective of this paper is to present ananalysis of necessity of providing expansion joints in the plain cement concrete pavement considering the climate and weather conditions of Vietnam. This study would help in the proper designing of expansion joints of highways and airport roads and thus can improve life span of cement concrete pavements to be constructed in Vietnam.

scholarly journals Design of roller compacted concrete composition

2021 ◽  
Vol 2 (92) ◽  
pp. 12
Author(s):  
Yaroslav Balabuh ◽  
Uliana Marushchak ◽  
Volodymyr Bidos
Keyword(s):  
Road Construction ◽  
Cost Effective ◽  
Normal Weight ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Roller Compacted Concrete ◽  
Road Pavement ◽  
High Speeds ◽  
Cement Concrete Pavement ◽  
Pavement Construction

Abstract. Problem. World experience shows that high operational performance of road coverings in the conditions of intensive traffic with high speeds of motor transport and sharp braking are provided by introduction of cement concrete. One of the effective solutions for the construction of high-quality, dura-ble, economical pavements is the use of roller-compacted concrete - a no slump concrete with low water-cement ratio, that is placed by an asphalt pav-er similar to asphalt pavement construction. The design of quality mixtures of roller-compacted con-crete is based on performance, construction require-ments and economic efficiency. Goal. The purpose of the work is design the compositions of roller com-pacted concrete and investigation of their strength. Methodology. Roller compacted concrete samples were tested for compressive strength and tensile bending in accordance with DSTU B B.2.7-214:2009. Results. The four variants of mixtures are designed to select the optimal composition of roller compacted cement concrete. The first of one is based on the particle size distribution of aggregate grains in ac-cordance with DSTU B B.2.7-127:2015, the second variant shows the composition of normal-weight cement concrete class C25/30, the third variant is characterized by increased sand fraction and in the fourth composition fine fractions replaced with sand. Road rolled concrete С32/40 Bb b5.2 is designed. Originality. Roller compacted cement concrete for effective road construction technologies is designed, which allows to perform the installation of high per-formance cement-concrete pavement with the use of asphalt pavers and rollers and the possibility of rap-id commissioning of cement-concrete pavement. Practical value. Designed composition of roller compacted concrete with the use of local Ukrainian materials allow to ensure the construction of cost-effective, durable road pavement with the possibility to carry out the movement on the cement concrete pavement after 1-3 days.

scholarly journals IMPROVING THE DURABILITY OF CEMENT CONCRETE TO COVER ROADS

2020 ◽  
Vol 1 (46) ◽  
pp. 324-332
Author(s):  
Stozhka V ◽  
◽  
Borkowski P ◽  
Keyword(s):  
Road Construction ◽  
Small Scale ◽  
Water Repellent ◽  
Cement Concrete ◽  
Chemical Additives ◽  
Scientific Publications ◽  
The Road ◽  
Security Issues ◽  
Cement Concrete Pavement ◽  
Object Of Study

The article is devoted to the problem of improving the durability of cement concrete to cover the road through the use of additives. The purpose of the work-improving the durability of cement concrete to cover roads through the use of hydrophobic additives. Object of study-cement-concrete to cover roads. Method of research: statistical analysis of scientific publications, technical and normative literature. In Ukraine, there are almost no necessary types and brands of road cement, so the research and application of existing binders with effective additives is an urgent problem, the solution of which will expand the nomenclature of cement binders for road Construction, improve the durability and resistance of cement concrete covering roads, bridges and airfields, as well as to solve security issues. For this, it is possible to use chemical additives that kolatating pores, give the surface of concrete water-repellent properties, involve in the concrete mixture of air. Based on the modern representations of the physical- xiemia of superficial processes, it can be concluded that the introduction to the concrete mix of small-scale kremnijorganicnih substances together with the water of the closing, will allow to significantly improve the durability and strength against At the same time for the concrete of aggressive factors and load. The influence of hydrophobic additives on physical, mechanical properties of cement concrete to cover roads is investigated. Based on the experimental results, it is determined that the application of 0.1­0.15% hydrophobic additives 136-157 M has a significant increase in the durability of cement concrete for the seal of roads. KEYWORDS: CEMENT CONCRETE PAVEMENT, HYDROPHOBIC ADDITIVES, FROST RESISTANCE, WATER RESISTANCE, STRENGTH, DURABILITY

Experimental Investigations on Aluminium Ultrasonic Welding Parameters

2014 ◽  
Vol 657 ◽  
pp. 306-310
Author(s):  
Lăcrămioara Apetrei ◽  
Vasile Rață ◽  
Ruxandra Rață ◽  
Elena Raluca Bulai
Keyword(s):  
Microstructural Analysis ◽  
Base Material ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Experimental Investigations ◽  
Welding Parameters ◽  
Material Structure ◽  
Welding Temperature ◽  
Wide Range ◽  
Made In

Research evolution timely tendencies, in the nonconventional technologies field, are: manufacture conditions optimization and complex equipments design. The increasing of ultrasonic machining use, in various technologies is due to the expanding need of a wide range materials and high quality manufacture standards in many activity fields. This paper present a experimental study made in order to analyze the welded zone material structure and welding quality. The effects of aluminium ultrasonic welding parameters such as relative energy, machining time, amplitude and working force were compared through traction tests values and microstructural analysis. Microhardness tests were, also, made in five different points, two in the base material and three in the welded zone, on each welded aluminium sample. The aluminum welding experiments were made at the National Research and Development Institute for Welding and Material Testing (ISIM) Timişoara. The ultrasonic welding temperature is lower than the aluminium melting temperature, that's so our experiments reveal that the aluminium ultrasonic welding process doesn't determine the appearance of moulding structure. In the joint we have only crystalline grains deformation, phase transformation and aluminium diffusion.

Stress Analysis of Cement Concrete Pavement under Overweight Loads

2012 ◽  
Vol 446-449 ◽  
pp. 949-953
Author(s):  
Ya Ni Lu ◽  
Tao Li Xiao
Keyword(s):  
Finite Element ◽  
Regression Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Concrete Pavement ◽  
The Other ◽  
Tension Stress ◽  
Statistical Regression ◽  
Cement Concrete ◽  
Cement Concrete Pavement

Special load has produced serious damage to the concrete pavement because of the great gross weight and heavy axle load, but the present specification has not mentioned this kind of load. On this occasion, Several conditions of critical load are identified through ANSYS finite element model analysis and the formula through statistical regression analysis to the bottom maximum tension stress is drawn up. Which can not only guide the concrete pavement design under the special load but also the result may be referred by the other kinds of engineering.

Durability of Cement Stabilized Cold-Recycled of Asphalt Pavement Materials

2012 ◽  
Vol 174-177 ◽  
pp. 1188-1192 ◽  
Author(s):  
Lian Yu Wei ◽  
Zhi Yu Guo
Keyword(s):  
Asphalt Pavement ◽  
Base Material ◽  
Road Construction ◽  
Thermal Shrinkage ◽  
Construction Process ◽  
Pavement Materials ◽  
Road Base ◽  
Wide Range ◽  
Dry Shrinkage ◽  
Recycled Material

In recent years, due to the dual pressures of resources and the environment,the clod recycled technology renovation and expansion of the old road and new road construction process increasingly attention increasingly wide range of applications. In this paper, the water stability of the cold recycled materials in asphalt pavement on cement additives, frozen stability, thermal shrinkage resistance, dry Shrinkage thefour indicators of experiments to evaluate its durability, and compared with the typical semi-rigid material. To verify the feasibility of the cold recycled material as road base material.

scholarly journals Test Study on Road Performance of Soils Stabilized by Liquid Stabilizer in Seasonally Frozen Regions

2012 ◽  
Vol 5 ◽  
pp. 310-315 ◽  
Author(s):  
Yao Chen ◽  
Yi Qiu Tan
Keyword(s):  
Water Resistance ◽  
Base Material ◽  
Road Construction ◽  
Penetration Resistance ◽  
Comprehensive Investigation ◽  
Test Study ◽  
Stabilized Soil ◽  
Road Performance ◽  
Modulus Of Resilience ◽  
Seasonally Frozen Regions

In seasonally frozen regions, road construction often suffers from low strength,lack of durability, etc. Improving the typical clay’s workability in Changchun with lime and the Base-Seal stabilizer (BS-100) shows promising results. A comprehensive investigation to assess the soil characteristics influence is undertaken, so as the lime and liquid stabilizer (BS-100) content on the physical properties of stabilized soils in seasonally frozen regions. The optimum mix proportions, unconfined compressive strength, splitting strength, modulus of resilience, freeze-thaw action, water resistance and penetration-resistance were outlined. By comparing with current specifications, the Base-Seal stabilized soil as base material has higher early strength, higher after-strength and better frost stability.The results can be applied in road construction in seasonally frozen regions.

Sign in / Sign up

Export Citation Format

Share Document