ملخص الدراسة:

The main goal of this research is to produce Ultra High Performance Self Compacting Concrete (UHPSCC) in Gaza strip, using materials which are available at the local markets. Different trial mixes were used to obtain the acceptable fresh properties of Self compacting concrete with a compressive strength exceeding 140 MPa. The research includes also the use of a recognized manufacturer mineral admixture, basalt aggregate, quartz, and special type of fine aggregate (quartz powder). The elimination of vibration for compacting concrete during placing through the use of Self Compacting Concrete leads to substantial advantages in terms of better homogeneity, enhancement of working environment and improvement in the productivity by increasing the speed of construction. The resulting concrete is characterized in the fresh state by methods used for Self Compacted Concrete, such as slump-flow, V-funnel and L- box tests. The fresh and hardened mechanical properties of UHPSCC were studied, i.e., workability, viscosity, flowability, passing ability, self compacting, compressive strength, split cylinder strength, and flexural strength. The effect of using different superplasticizer and silica fume doses on these properties are obtained within research work. The effect of adding different amounts of basalt aggregate (150%, 160%, and 170%) by cement weight on the fresh and hardened properties of UHPSCC, i.e., workability, viscosity, flowability, passing ability, compressive strength, and density is also investigated. The results showed that the optimum mix is obtained by adding 160% basalt, 3% superplastisizer and 15.5% silica fume. The test results also revealed that it is possible to produce UHPSCC in Gaza Strip with compressive strength in excess of 140 MPa using (1%, 2%, and 3%) superplasticizer,10% to 16% silica fume, and 15.5% silica fume, with water cement ratio less than 0.33.

توثيق المرجعي (APA)