Abstract—In this study, the effects of high temperatures on physical on mechanical properties of self compacting lightweight concretes with marble powder are investigated. To this end, one control and three different types of mixes are prepared and exposed to high temperature with 300oC, 600oC, and 900oC for one hour at the end of 28 days curing. Marble powder is replaced by weight of cement by 10%, 15%, 20% and used in mixes as mineral additive. The compressive strength and ultrasonic pulse velocity values are concrete samples under high temperatures are measured and evaluated. As a result, the effect of high temperature on ultrasonic pulse velocity, compressive strength, and surface conditions cannot be ignored. Keywords— Self compacting lightweight concrete, marble powder, ultrasonic pulse velocity, compressive strength, high temperature I. INTRODUCTION HE use of lightweight concretes is highly popular in the construction sector. Lightweight concrete has superior characteristics compared to conventional concretes such as lightness, high temperature and sound resistance. However, lightweight concretes have low compressive strength and poor workability characteristics. Self compacting concrete (SCC) is a flowable special concrete that does not require vibration for placing and compaction. It is able to flow under its own weight, completely filling formwork and providing full compaction, even in case of congested reinforcement [1]. Today, different types of filler materials are used in self compacting concrete mix to increase durability and strength properties of plain concretes. One of these filler materials is marble powder. Marble powder is a by-product that release during the production of marble processing and the vast majority of them are less than 200 microns. These by- products release after precipitated by sedimentation method and directly into the field. Thus, using of marble powder in different industrial areas is highly useful in terms of to reduce environmental pollution [2]. 1 The Department of Mining Engineering, University of Yüzüncü Yıl, 65080, Van, Turkey, E-mail: fundaturkmenoglu@yyu.edu.tr 2 The Department of Mining Engineering, University of Çukurova, 65080, Adana, Turkey 3 The Department of Civil Engineering, University of Yüzüncü Yıl, 65080, Van, Turkey Concrete throughout its service life can be damaged by chemical and physical effect. These chemical and physical effects may lead to some negative results and decrease function and durability of concretes. One of these physical effects is the fire and high temperature. In the case of fire temperature values may rise to 1200o C. The effects of high temperature on the properties of concrete have been investigated since the middle of the 20 century [3-7]. Physical and mechanical properties can be changed when concretes exposed to high temperature [8]. Affecting of concrete in high temperatures depends on the concrete components, moisture in the beginning conditions, the cement paste, and aggregate type. It can be easily seen the color changes on the concrete surfaces as well as mechanical properties of concretes under high temperature conditions. For example, if the colour of concrete turns into pink or red, it means that the heat is possibly between 300oC and 600oC. If it is grey, the heat of concrete is between 600oC and 900oC [9-10]. In this study, the effects of high temperature on the loss of unit weight, ultrasonic pulse velocity, and compressive strength of self compacting concretes with marble powder are investigated and discussed. II. EXPERIMENTAL PROGRAM In all of mixes, CEM I 42.5 N Portland cement, pumice with maximum aggregate size of 8 mm, marble powder and superplasticizer are used according to Turkish Standard TS EN 197-1 [11]. The specific gravity and specific area of cement 3.09 and 3865 cm2/g, respectively. Pumices obtained from Van (Erçiş-Kocapınar) areas with the size of 0-2 mm (A1), 2-4 mm (A2), and 4-8 mm (A3) are used in concrete mixes. The specific gravities of A1, A2, and A3 aggregates is 1.72, 1.32 and 1.06, respectively. The unit weights of pumice aggregates are obtained as 636 kg/m3, 495 kg/m3, and 413 kg/m3, respectively. The marble powder is supplied from Malaylar Mermer A.Ş. that is located in Van organized industrial site. The marble powder used in all concrete mixes is dryed at 105oC in drying oven before using in concrete mixes. The specific gravity of marble powders is 2,61. Several design procedure based on scientific theories or empiritical experience have been proposed for normal SCC. In this study, all mix design of self compacting lightweight concrete have been done according to ACI 211.2-98 [12] and ACI 237R-07 [13] design codes. One control and three different mixes are The Effect of High Temperature on Physical and Mechanical Properties of Self Compacting Lightweight Concretes Zehra Funda Türkmenoğlu 1* , Ahmet Mahmut Kılıç 2 and Soner Güler 3 T Int'l Journal of Research in Chemical, Metallurgical and Civil Engg. (IJRCMCE) Vol. 3, Issue 2 (2016) ISSN 2349-1442 EISSN 2349-1450 http://dx.doi.org/10.15242/IJRCMCE.U0716305 235