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.

Improvements on the performance and durability aspects of airfield CONCRETE pavements are very crucial issue for operational and safety. In this regard, self-consolidating CONCRETE ((SCC)) mixtures proposed for this means and their engineering properties were assessed. The effects of (1) w/c ratio, (2) cement content, (3) and air-entrancement agent are designated to be assessed from the aspects of rheological, mechanical and durability properties. The results confirmed the effectiveness of air-entrained (SCC) mixtures for freeze-and-thaw actions. Moreover it was found that the w/c ratio and cement content could be useful in this regard.

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.

Self Compacting CONCRETE ((SCC)) was developed to eliminate the need to compact by mechanical means and to improve the durability of CONCRETE. After its introduction, it found an unusual interest and rapidly was developed throughout the world. For achieving (SCC), it is required to make a proper equilibrium between viscosity and deformability in both paste and mortar, so a reasonable resistance to segregation with a high deformability can be acquired. The key to this equilibrium, is limiting coarse aggregates, use of chemical additives and high content of powders. High content of powders, which are used in (SCC), has considerable influences on its properties. Limestone powders can increase the heat of hydration and a considerable decrease in resistance to sulfate attacks. The powders may also result in a considerable decrease in fire resistance of CONCRETE, because of low thermal stability of powder or high packing of system, which can cause spalling in early stages of fire.

This paper compares the results of two experimental studies on bond strength of steel and GFRP bars in the case of self-consolidating CONCRETE ((SCC)). Each study included pull-out tests of thirty six reinforcing bars embedded in CONCRETE specimens. Two types of CONCRETEs, normal CONCRETE and self-consolidating CONCRETE were used in different studies. Different parameters such as bar location and cover thickness were considered as variables in different specimens. The comparison between the results of GFRP reinforcing bars with those of steel deformed bars showed that the splitting bond strength of GFRP reinforcing bars was comparable to that of steel bars in both normal strength and self-consolidating CONCRETE ((SCC)). The bond strength of bottom reinforcing bars was almost the same for both normal CONCRETE and self-consolidating CONCRETE. However, for the top bars, the bond strength of self-consolidating CONCRETE was less than that of normal CONCRETE.

In Iran, the increase in migration in the cities and the increase in the construction of buildings has caused a lot of extraction of natural stone mines for the production of CONCRETE. Also, repairing or demolishing dilapidated buildings increases the production of waste and construction waste, especially in big cities. Unfortunately, a large amount of these construction wastes are transferred to the surroundings of the cities as waste and buried. These two causes cause the sustainability of the environment to face a serious risk. The use of recyclable materials and their reuse in the construction of new materials has many advantages, which include economic savings, reducing the amount of waste and preserving natural resources such as stone mines. In this research, with the aim of recycling and reusing construction waste, ceramic waste in different volume ratios of 25%, 50%, 75% and 100% was used instead of natural sand in SELF-COMPACTING CONCRETE. Also, in order to increase the quality of rheology and consistency of (SCC) CONCRETE, zeolite powder was used instead of stone powder. The tests performed include slump flow, V funnel, L box, compressive strength at different ages, CONCRETE durability check against freezing, and CONCRETE failure SEM check. The results of this research showed that adding up to 25% of ceramic waste in CONCRETE reduces the 28-day compressive strength by less than 10%. Also, the amount of weight loss and resistance of this design after exposure to 300 cycles of melting and freezing were measured as 3.2% and 5.9%, respectively.

Nowadays, utilization of pozzolanic materials is one of the usual method for improvement of CONCRETE strength. Pozzolanic reactions cause to voids in CONCRETE materials filled and in continue strength and bearing capacity increased. Zeolite is one of the natural pozzolan is found in Iran and can be extracted and processed simply. In present laboratory research, compressive and tensile strength of SELF-COMPACTING CONCRETE ((SCC)) contains zeolite and glass fiber reinforced polymer (GFRP) were evaluated. For this purpose, zeolite content 0, 10 and 20 percentage (in weight) and GFRP value 0, 0. 5 and 1 % (in weight) of cement amount were considered. Therefore, nine mix design for specimens prepared and compressive strength and Brazilian tests performed. Results of present study showed that zeolite in (SCC) can increase compressive strength. So that, maximum and minimum bearing capacity values in specimens with zeolite respectively 13. 24 and 8. 82 percentage are more than unimproved condition. Also, 10% zeolite in specimens (improved by zeolite and GFRP) with 28 days curing is more effectiveness than 20% in compressive strength. In the other side, Variations of tensile strength in improved (SCC) specimens from the point of view GFRP effectiveness illustrated 1 % GFRP significantly increase tensile strength in specimens (improved by zeolite and GFRP).

In recent years, with the increasing demand for modern and environmentally friendly materials, natural pozzolan s can be proved to be such a material and several researchers have focused their research efforts in using it as a partial substitute in the manufacture of CONCRETE and mortar. This study concerns the fresh and hardened properties of self-compacted CONCRETE ((SCC)) with natural zeolite (NZ). (SCC) mixtures were prepared by inclusion various amounts of NZ (0– 20% by weight of cement) at different water/binder ratios. The fresh properties were investigated by slump flow, visual stability index, T50, V-funnel and L-box. The slump flow and compressive strength changes with hauling time were also considered. The hardened properties were tested for compressive strength, splitting tensile strength, ultrasonic pulse velocity (UPV), initial and final absorption. Results showed that with the inclusion of NZ, (SCC) can be successfully produced with satisfactory performance in flow ability, passing ability and viscosity. For all mixtures, flowability was lost with hauling time, although the rate of slump flow reduction was higher for mixes with higher amount of NZ. Regarding to hardened properties, the effect of NZ on the compressive and splitting tensile strength of (SCC) mixtures is generally related to its W/B ratio. Moreover, compressive strength enhancement was seen for mixes with slump flow higher than 550 mm at prolonged mixing time. The UPV measurement shows that the effect of NZ on the UPV values at a high compressive strength are negligible. Compared to control (SCC), absorption characteristics of (SCC) containing NZ significantly decrease with increasing ages.