Abstract
Considering the fact that Iran is one of the world's most seismically active countries, the use of lightweight concrete in constructions is reasonable which will reduce the seismic effective weight of the structures and therefore they will be less imposed to earthquake forces. So it is important to study about using lightweight concrete in construction in Iran. Considering the importance of the possibility of industrial production of light weight concrete, the cost effectiveness of design plays an important role in the approval or rejections of such plans. In this study the effect of the ratio of cement paste volume to the aggregate volume on the compression strength, density, viscosity and cost effectiveness of nine different mixture plans is studied. The cost effectiveness of the plans is adjusted by a cost factor based on the average price of materials. Due to the fact that the main goal of our examination is to observe the effects of the volume of binding materials in the plans under study, the water-cement ratio and type of cement (Portland 425-1) is kept constant while the total volume of the cement paste is varied and its effects on the factors noted above is studied. The aggregate materials of these designs include artificial aggregate (Lica) which are tested based on three different types of grading: 1-Light Coarse aggregate+s and 2-Light Fine aggregate+sand 3-Mixture of Coarse and Fine aggregate+sand.
Highlights
Due to lower strength of concrete parts relative to Steel parts; the concrete parts have bigger dimensions in comparison with Steel parts and the parts form considerable section of dead load of the building in concrete constructions (ACI 213R-03, 2003)
The lightweight concrete is often applied as a proper replacement for common concrete as well as for the purpose of weight reduction of structure; even though it’s ultimate compression strength is lower in comparison with common concrete
The production cost of structural lightweight concrete is higher in comparison with common concrete, but cost increase resulting from exercising special preparation in make of lightweight concrete would be compensated in lieu of each cubic meter, with reduction of dead load and increase of concrete resistance against fire and improvement of concrete’ insulator properties
Summary
Due to lower strength of concrete parts relative to Steel parts; the concrete parts have bigger dimensions in comparison with Steel parts and the parts form considerable section of dead load of the building in concrete constructions (ACI 213R-03, 2003). The first approach is lightweight aggregate concrete with integrated structure in which the common lightweight-grain used in the concrete. This type of concrete could be utilized as structural concrete, non-structural concrete or thermal insulator. Coarse-grained is used in this type of concrete but the use of lightweight-grain to high extent could reduce the specific weight of concrete and create a better thermal insulating properties. These concretes are known as concrete without fine-grained (ACI 213R-03, 2003).
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