Bahar Demirel

Waste marble powder/dust

Abstract One of the most important parts of the mining industry is the marble industry. The use of marbles in the structures dates back to ancient times. However, especially in the last decades, the use of marble in the structures has increased too much. As the production in the marble factories increases, the amount of waste has reached a volume that cannot be stored. Marble wastes are formed as a result of cutting and polishing processes in marble factories. These by-products, which cannot be stored, should be utilized in other sectors. So, both economic losses can be reduced and environmental pollution can be prevented. In this chapter, firstly, the occurring process of the waste marble powder (WMP) is briefly explained. Moreover, then, the physical and chemical properties of WMPs that used in the different studies in the literature are presented. The fresh, strength, and durability properties of conventional and self-compacting concrete (SCC) produced by replacing with WMP were investigated in comparison with the literature. It has been observed that the use of WMP by replacing with cement or sand in both conventional and SCC positively affects fresh and hardened properties of these concretes. The use of WMP instead of raw materials (e.g., sand, coarse aggregate) obtained from the natural resources reduces the energy consumption and the use of these natural resources. As a result, it is possible to obtain economical and eco-efficient concretes using WMP.

Effect of High Temperature on Compressive Strength of Concrete Prepared Using Different Types of Aggregates

Concrete is a building material commonly used in the construction structures. There are many reasons why concrete is preferred. One of these reasons is fire resistance of concrete. Concrete is not a combustible material, but it behaves differently under high temperature. Aggregates constitute an important part of concrete volume. Differences in aggregate properties significantly affect the performance of the concrete during heating. Differences in these properties also cause cracks and breakages in parts of the concrete and significant losses in adherence. When we look at these effects, we have seen that high temperature creates a threatening environment for concrete. Therefore, it is necessary to investigate the behavior of the concrete caused by the high temperature. In this study, we investigated the effect of high temperature on the compressive strength of concrete specimens prepared using different aggregate types. For this purpose, 10 × 10 × 10 cm and 15 × 15 × 15 cm cube samples were prepared by using CEM I 42,5 (N) type Portland Cement and two different types of aggregates (basaltic crushed stone, stream aggregate). The Concrete produced using basalt crushed stone is coded as “BCC” and the concrete produced using the stream aggregate is coded as “SAC”. These concrete specimens were tested at room temperature and high temperature (300, 600 and 900 °C) after 28 days. We used the remaining samples at room temperature as control samples. We tested the compressive strength on all concrete samples. We studied the relationship between the compressive strength results and the concrete mass size. As a result of this study, it was found that the compressive strength of BCC is higher than SAC. When the relationship between the strength values of the concrete with high temperature effect and the concrete sample size was examined, it was found that the temperature affected the center of the small concrete samples more quickly. The resulting data showed that the 10 × 10 × 10 cm size concretes have low compressive strength.