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 94
- Downloads 0
THEORETICAL ANALYSIS OF BUILDING INFORMATION MODELING LIBRARIES (BIML)
The main countries benefiting from BIM support are countries like Finland, Norway, Denmark, Great Britain and USA. One of the support from BIM are Building Information Modeling Library (BIML). This paper presents the dev...
MONITORING OF INDOOR AIR IN A PASSENGER RAILWAY WAGONS
In low-energy and passive houses, about 80 % of the total energy is consumed for fresh air heating or cooling, the reason being the improved thermal insulation and air tightness of such a building. In fact, actual trend...
Determination of the volume air exchange in the apartment
Currently in the building industry is trend to build buildings consuming little energy. For the aim reducing heat loss buildings they are building insulated and also air tightness of buildings increases.. By improving th...
MECHANICAL AND PHYSICAL PROPERTIES OF LOW-ENERGY MULTICOMPONENT CEMENTS
One of the main tasks of building industry is to reduce carbon dioxide emissions, which are generated during the cement production, without losing the properties and quality of the binding agent. Production of composite...
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...