SELF-COMPACTING CONCRETE (SCC). was developed about four decades before since that time it has been used very scarcely due to a number of problems including: separation, lack of flowability and filling ability, high cracking potential, and thereupon low compressive and tensile strength. In this study, properties of SCC containing viscosity modifying agent, steel and polypropylene fibers were investigated. polypropylene fibers with dosages of 0. 1, 0. 125, 0. 20, 0. 150, 0. 185, 0. 205, and hook end steel fibers with volume fractions of 0. 5, 1, 1. 5, 0. 2 and 2. 5 were employed; fresh and hardened SCC were examined. The results of the fresh CONCRETE tests revealed that rise of the both fiber types reduces the slump flow and raises the T50 time. In the V-funnel test, the time shortened with polypropylene fibers up to dosage of 1. 25%, and then soars. Growing steel fibers elongate the time of the V-funnel test. Adding both types of the fibers reduces the passing ability of CONCRETE in the L box test. Hardened CONCRETE tests indicated that the compressive strength is falling by rising the dosage of steel fibers. The compressive strength at the age of 7 and 28 days improves up to the polypropylene fiber dosage of 1. 50% and then declines. At the age of 90 days, strength trend changes in dosage of 0. 1. Tensile strength grows as the both fibers increase. The crack test results show that the length and width of the cracks lower with the growth of the fibers. Adding steel fibers boosts the number of cracks.

Fiber CONCRETEs are a new type of composite material in the manufacturing industry, due to lack of information, identification behavioral characteristics requires laboratory studies. In this research, the bending behavior one layer and multi-layer slabs made with high performance SELF-COMPACTING CONCRETE reinforced by steel and plastic fibers has been studied. The slabs made in this study differ from 10 models, 4 models one layer and 6 models with three layers make-up, in which the type and volume the fibers vary in layers. Two sample were made from each model and a total 20 slab samples with dimensions 40  40  7. 5 cm the three-point bending test slab were performed, in order to evaluate the effect adding steel and plastic fibers and their layout on the bending behavior of the slabs. The results showed that the steel fibers can significantly improve the bending behavior of the slabs, so that, after the first cracking crack, the cracking was done on the cracks and its extension was prevented, the creep behavior the unbleached CONCRETE slabs They have increased their bending strength and ductility considerably. If plastic fibers were much less effective than steel fibers. The flexural behavior three-layer slabs with a fixed volume fibers distributed in such a way that the percentage fibers in the outer layers is more than the middle layer, improved compared to single-layer slabs, which can be due to an increase in the percentage fibers In the outer layers, because these layers are more tense than the middle layer.

The development of SELF-COMPACTING CONCRETE marks an important mile stone in improving the product quality and efficiency of building industry. SCC homogeneously spreads due to its own weight, without any additional compaction energy and does not entrap air. The required flowability is achieved by using more fines (cement+filler) and reducing coarse aggregate content. The present research work was aimed to develop SCC by using Lime stone quarry fines and fly ash as filler and to study its effect on abrasion resistance of Self- Compacting CONCRETE. The test results indicate that the SCC mixes with lime stone quarry fines and fly ash significantly improved the depth of wear, compressive strength, tensile strength and flexural strength.

One of the important issues in the production of CONCRETE is environmental variability that affects the CONCRETE and elements constructed from this material. Due to the importance of different characteristics of CONCRETE in short- and long-term conditions, this article aims to investigate the influence of initial temperature conditions of SELF-COMPACTING CONCRETE on its long-term characteristics and determine the initial optimal temperature of CONCRETE. For these purposes, several experiments under three temperature conditions of 5, 20, and 40 degree-of-Celsius were conducted to evaluate the rheology and mechanical properties of fresh CONCRETE in the range of 7 and 28 days. In these experiments, alternative mineral admixtures of cement such as micro-silica, fly ash, and zeolite were used to build the CONCRETE specimens. Results demonstrate that the mechanical properties of the specimens increase with increasing initial temperature in the short term, while such properties significantly decrease in the long term compared to the specimens constructed under lower initial temperature. Moreover, the fluidity of SELF-COMPACTING CONCRETE increases with increasing initial temperature.

SELF-COMPACTING CONCRETE is one of the most widely used CONCRETE in the past two decades. The objective of present study is to introduce a new method for high strength SELF-COMPACTING CONCRETE mix design to both achieving maximum compressive strength and minimizing the cost of CONCRETE. The proposed method is an analytical method. In this method, using optimization concepts such as Lagrangian function and Kuhn– Tucker conditions, and introducing a specific relationship to the compressive strength of CONCRETE, without the need for computer computations, and based on a completely analytical method, provides optimal CONCRETE mix design. The proposed method is a general approach and is applicable to all types of CONCRETE. Here, for the purpose of introducing, the method used to high strength SELF-COMPACTING CONCRETE containing fly ash. An optimization model of the CONCRETE mix design is first developed accounting for effects of experimental results. Then, using an optimization algorithm, optimal CONCRETE mix design is obtained for the CONCRETE with the strength under consideration. Results showed that the proposed method can provide optimal mix design of high-strength SELF-COMPACTING CONCRETE while water and cement amount are the minimum amounts required for selfcompacting CONCRETE.

Despite the fact that in most operating conditions, CONCRETE components, compaction and curing affect the performance of CONCRETE, but premature failure of CONCRETE structures due to problems with the durability of CONCRETE structures also occurs a lot. Due to the lack of information on the effect of type and strength of aggregates on the durability of SELF-COMPACTING CONCRETE, in this article, using the tests of "friction transfer" and "drilled core" to investigate the effect of strength of different aggregates on the reliability of CONCRETE SELF-COMPACTING has been exposed to sodium sulfate. 9 types of stones with the names of travertine, granite, basalt, andesite, marble, green stone tuff, crystal green tuff, rhyolite and limestone have been used to make SELF-COMPACTING CONCRETEs. Compressive strength tests of SELF-COMPACTING CONCRETEs cured with water and sodium sulfate solution were performed at ages 7, 14 and 28. The results showed that the volume change of rocks with higher water absorption percentage was less and there is a direct relationship between the compressive strength of SELF-COMPACTING CONCRETEs treated in water and sodium sulfate solution with the strength of the parent rock. We also see an increase in compressive strength of SELF-COMPACTING CONCRETE placed in sodium sulfate solution at a young age compared to samples placed in water. There is also a linear relationship with a high correlation coefficient between the results of the friction transfer test and the core correction test. Compressive strength of crystalline green tuff, green tuff, andesite, rhyolite, travertine, lime, marble, granite and basalt are 31.76, 33.12, 39.92, 43.43, 48.41, 51/97, 59.66, 62.17 and 75.41 Mpa, respectively. With increasing compressive strength, the results of friction transfer test also increased so that for the mentioned rocks are equal to 132.4, 146.9, 155.9, 168, 176.3, 185.3, 189.8, 5 / 198 and 9/207 Nm.

Understanding the physical microstructure, including pores size distribution and water absorption of CONCRETE, because of its effect on long-term durability is important. The aim of the present study is to investigate the effect of physical microstructure of pozzolanic SELF-COMPACTING CONCRETEs on compressive strength and water permeability. SELF-COMPACTING CONCRETE mixes were designed with total cementitious material content of 450 kg/m 3 with water to cementitious material ratio of 0. 35, 0. 45 and 0. 55. The binary and ternary blends of cement, silica fume and metakaolin were used for the purpose of present study. In order to investigate the difference between the effect of metakaolin and silica fume on the physical microstructure, mixtures containing binary and ternary blends of cement, silica fume and metakaolin with water to cement ratio of 0. 45 were considered. Pore physical microstructure characteristics including median pore size, volume of large and small capillary pore in SELF-COMPACTING CONCRETEs were investigated. Pore size distribution of selfcompacting CONCRETE samples were measured by mercury porosity test. The compressive strength, water absorption and capillary water sorptivity were performed on samples. The results showed that an important effective factor on compressive strength and water permeability is the medium size of the pores and the volume of large capillary pores. The CONCRETE containing 20% metakaolin and 8% silica fume did not have the lowest porosity despite having the highest compressive strength. The lowest porosity with 8. 6% belongs to SELF-COMPACTING CONCRETE containing silica fume with water to cement ratio of 0. 35.