ROAD CEMENT CONCRETES BASED ON MODIFIED ADDITIVES OF NEW GENERATION
Journal Title: Вісник Національного університету "Львівська політехніка". Серія "Теорія та практика будівництва" - Year 2018, Vol 0, Issue 888
Abstract
The modified concrete mixes design and cement concrete with the given operational parameters was developed. During the experiment, cement concrete was obtained from concrete mixtures of various compositions with modifying additives of a new generation containing a superplasticizer based on polycarboxylates and an air-absorbent additive. Superplasticizer was injected into a concrete mix with water in a quantity of 0,6; 0,8 and 1,0 % of the mass of cement, and the additive-aeration – in the amount of 0,1 % of the mass of cement in all the components of concrete. The influence of modifying additives on the properties of road cement concrete has been investigated. The effectiveness of their use in road surfaces is shown, which provides improved technological parameters, increased strength and durability. Air-absorbent additive-airant, in combination with a superplasticizer, allows to enhance the plasticization of the concrete mixture, as well as increase the frost resistance and waterproofness. The introduction of a modifying additive from 0,6 to 1,0 % ensures an increase in the strength of concrete in the early hardening period (2 days) from 8,7 to 11,0 MPa. After a month of hardening the strength of such concrete is 39,2 – 39,9 MPa, which corresponds to the class of concrete B30. The use of a modifying additive during the preparation of a concrete mix allows the design of concrete with a water-cement ratio, which will reduce the open porosity of the concrete, increase its density, and thereby prevent the formation of highlands on the surface of concrete. When introducing a modifying additive, porosity is reduced by 1,4-2 times, which correlates with the results on the strength of concrete. The techno-economic efficiency of the use of road cement concrete on the basis of new generation modifying additives was determined and the construction of cement-concrete coating was found to be cheaper by 1,6 times the construction of road pavement from asphalt concrete in comparison with the cost of construction and installation work.
Authors and Affiliations
Yuriy Sobko, Halyna Shevchuk, Nataliya Topylko
Keywords
Related Articles
- EP ID EP494733
- DOI -
- Views 87
- Downloads 0
ВПЛИВ ВОДЯНИХ СТРУМЕНІВ ВІЯЛОВОГО ТИПУ НА ТЕПЛОВИЙ ЗАХИСТ ПІД ЧАС ПОЖЕЖ
The article deals with the following methods of protection of personnel from thermal radiation during fire, such as the use of heat-shielding suits, heat-reflective screens and water curtains. The tactical and technical...
TO THE QUESTIONNAIRE OF THE OPERATING CONDITION OF SPAN CONSTRUCTIONS OF ROAD BRIDGES IN WESTERN AREAS OF UKRAINE
By using the examples of large – scale inspections of iron – concrete bridges the defects and damaqes of elements, the degradation of structural materials are shown. The examples of structure imperfection, tipical defect...
INCREASING WATER RESISTANCE OF GYPSUM BINDERS
One of the possible ways of restoring and further effective development of the construction industry with small investments is to expand the production and use of low-energy nonclinker binders. The use of gypsum and gyps...
OPERATING STATE OF SPAN CONSTRUCTIONS OF EXISTINGMETALLIC BRIDGES ON AUTOMOTIVE ROADS IN THE WESTERN AREAS OF UKRAINE
By using the examples of large – scale inspections of metallic bridges the defects and damaqes of elements, the degradation of structural materials are shown. The examples of structure imperfection, tipical defects, oper...
ДИСПЕРСНЕ АРМУВАННЯ СІРЧАНИХ БЕТОНІВ СКЛОВОЛОКНОМ ТА ЇХНЯ ВИТРИВАЛІСТЬ
Disperse reinforcing fibers of different materials and different lengths can significantly effect the basic characteristics of concrete, including increasing compressive strength and tensile, impact strength, wear resist...