On the basis of experimental results, this paper discusses the shear-crack behaviors such as shear-cracking force and shear-crack width of reinforced full-recycled aggregate concrete beams. The full-recycled aggregate concrete was developed for the sustainable development in civil engineering, in which the coarse aggregate was the recycled aggregate made of abandoned concrete, and the fine aggregate was the machine-made sand. Sixteen beams, six of them without stirrups, were tested with the shear-span ratio varying as 1.5, 2.0 and 3.0, and the ratio of stirrups varying from 0.19% to 0.35%. The results showed that the shear-cracking force of the beam was mainly affected by the shear-span ratio, the width of shear-cracks intersecting stirrups decreased with the increasing ratio of stirrups, but the maximum crack width almost exceeded the limit 0.3mm in the first class environmental condition specified in Chinese code GB50010-2010. Comparing the calculation results by substituting the test parameters of full-recycled aggregate concrete beams into the formula of ordinary reinforced concrete beams, the lower resistance of reinforced recycled concrete beam to shear-cracking, and the larger crack width intersecting stirrups should be noted in the structural design. Based on the test data, the formula for calculating the shear-cracking force and the shear-crack width of reinforced full-recycled aggregate concrete beams are suggested.
With silicon powder content and the hybrid fiber content as parameters, will be 1 as ordinary concrete beams and the control group, three different content of silicon powder and 2 root hybrid fiber volume content of beam as the experimental group, the modification of the flexural performance of recycled concrete beams is analyzed, the results show that modified regeneration of recycled concrete and ordinary concrete beams and damage has obvious four stages of the process, and its basic mechanical process also accord with flat section assumption; And with silicon powder and the mixed hybrid fiber recycled concrete beams is made of modified flexural performance enhancements, cracking resistance and ultimate bearing capacity is better than that of recycled concrete beams is ordinary; And the ultimate bearing capacity of normal section of the calculated in accordance with the specification was consistent with the test results, the modified recycled concrete can be carried out in accordance with the specification design, provides a reference for engineering practice. Introductions
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