Abstract
This paper presents experimental studies of rectangular concrete beam behaviors under axial load and bending loads and investigating the possibility of producing Lightweight Self-Compacting Concrete (LWSCC) by using the Attapulgite stone with a bulk density of about 776 kg/m3. The experimental work included (5) specimens which included using the silica fume by 10% and 15% as an addition to the mixture M2 and M3 . The shear span to effective depth (a/d) of beams was (2.5, 2.75, and 3.00). The test results showed an improvement in the mechanical properties of specimens containing silica fume by 15%, which was tested at 28 days. The first crack and the ultimate load were decreasing with increasing (a/d) ratios. Experimental results indicate a significant improvement in the properties of concrete and its resistance to shear stresses, as the axial load improves the shear capacity and reduces the shear failure in the (LWSCC).
Highlights
Concrete is of the most important available materials for construction in all over the world.the concrete construction is characterized durability, resistance to fire and low maintenance costs [1]
There has been a need to develop concrete performance in durability, strength and flow ability this leads to the innovation of a new type of concrete called Self-Compacting Concrete (SCC).SCC differs from ordinary concrete in that it compacts by mean of its self- weight without the need for external or internal vibrators so it can fill all parts of the mold and segregation resistance [3]
Table 5. shows the details of Lightweight Self-Compacting Concrete (LWSCC) beams that were used in this research include cement500 kg/m3, the sand 850 kg/m3, Attapulgite stone 290 kg/m3, Limestone 75 kg/m3, w/c 0.3, and Superplasticizer 14 l/m3.the BR1 was the reference beam while the other beams were used to study the effect of using the silica fume and shear span to effective depth (a/d) of LWSCC
Summary
Concrete is of the most important available materials for construction in all over the world. Based on the previous studies, Attapulgite clay was used as a coarse aggregate to produce lightweight concrete that was excellent by its light weight and fire resistance. The results showed that the compressive strength was better 5% and 15% at ages (28, 90, 180) days. The values of compressive strength and air dry density at age 28 days foe w/c 0.32 of LWSCC with Porcelinite aggregates were better than of the Thermostone aggregates. The variables included in this study are compressive strengths of 23,43and 53 MPa in addition to shear span to the effective depth (a/d) of (1.5, 2, 2.5, 3). The main objectives of this study the effect of axial load on behavior of LWSCC contain Attapulgite stone as a coarse aggregate. While second variable was using different value of shear span ratio (a/d)
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