the impact of using various percentage of nanoclay on the mechanical properties of concrete and on the flexural capacity of reinforced concrete two-way slabs was achieved in this study. The percentage of nanoclay content are (0%, 2%, 4%, 6%,8%, 10%) weight percent of cement, and in addition to the use of polypropylene content of 1.5%. The investigated mechanical properties of concrete were compressive strength, sp1itting tensi1e strength and f1exural strength. Six specimens of RC two way slabs were cast using those various content of nanocaly, the slabs were simply supported condition and under uniform load. Test indicated revealed significant improvement in the mechanical properties of concrete by using nanoclay due to its high pozzolanic activity which verifies the higher amount formation of C-S-H gel in the due to the presence of nanoparticles. When nanoclay proportion increased from 2% to 8%, the compressive strength increased about 3%, and 12.4%, respectively for samples with polypropylene equals 1.5%. While the splitting tensile strength increased by 4% up to 39.4% when using the same nanoclay proportion about 2% to 8%, respectively. The flexural modulus of rupture increased by 6%, and 36%, respectively for the same nanoclay proportion and polypropylene fiber content. The ultimate load capacity of the RC slabs increased by (12.5%) up to (66%) when the nanoclay content increased from (2% to 8%). However, using 10% nanoclay reduced the strength of the slab. In addition, different failure modes was observed for the slabs when using different percentage of nanoclay content.
This paper aims at presenting and discussing the numerical studies performed to estimate the mechanical and thermal behavior of RC flat slabs at elevated temperature and fire. The numerical analysis is carried out using finite element programs by developing models to simulate the performance of the buildings subjected to fire. The mechanical and thermal properties of the materials obtained from the experimental work are involved in the modeling that the outcomes will be more realistic. Many parameters related to fire resistance of the flat slabs have been studied and the finite element analysis results reveal that the width and thickness of the slab, the temperature gradient, the fire direction, the exposure duration and the thermal restraint are important factors that influence the vertical deflection, bending moment and force membrane of the flat slabs exposed to fire. However, the validation of the models is verified by comparing their results to the available experimental date. The finite element modeling contributes in saving cost and time consumed by experiments.
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