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Title: Plaster Mortar for Small Scale Tests

Author(s): B. V. Ranganatham, K. S. Subba Rao, and A. W. Hendry

Publication: Journal Proceedings

Volume: 64

Issue: 9

Appears on pages(s): 594-601

Keywords: beams (structural);bending;models;moments;mortars (materials);plaster; reinforced concrete;reinforcedment;research;slabs (nonmetallic)

DOI: 10.14359/7589

Date: 9/1/1967

To check the validity of theoretical analyses of structures, recourse is generally taken to extensive testing of small scale structures, taking care to see that the materials used in their construction faithfully reproduce the behavior of those used in the prototype. This investigation was devoted to the development of plaster mortar, which is shown to possess the mechanical properties warranted by similarity and also properties which make the construction of such test structures easy and rapid. Using plaster mortar in conjunction with threaded rods (which with or without suitable heat treatment simulate ordinary or cold-worked structural grade steel), ultimate moment capacity of simply supported beams was investigated and the specific bending resistance R obtained in terms of the reinforcement index q and the depth to shear span ratio (d/a ). Test results of many earlier investigators of reinforced concrete beams have been collated and analyzed for R. Tests on simply supported 10 1/2 in (26.7 cm) square plaster mortar slabs and 3 ft 6 in (1 .1 m) square slabs were also conducted. The test results are discussed and the suitability of plaster mortar for small scale test structures brought out.