AAC 2.5 Determination of the modulus of rupture of AAC

Keyword(s):  
Soil Research ◽  
1982 ◽  
Vol 20 (4) ◽  
pp. 315 ◽  
Author(s):  
RT Shanmuganathan ◽  
JM Oades

Three methods were compared for the determination of dispersible clay in the absence of chemical treatments. Treatment of the B horizon of a red-brown earth with a range of amounts (0-0.24% iron) of iron poly[Fe(III)-OH] cations of nominal molecular weight 10 000 to 50 000 allowed production of a range of dispersible clay contents from 0 to 70%. The samples of clay B horizon with decreasing contents of dispersible clay showed decreasing electrophoretic mobilities with zero mobility when the content of dispersible clay was zero. In such samples the clay particles were present in aggregates 50-250 mu m diameter according to sedimentation techniques. The amounts of dispersible clay present appeared to control various physical and mechanical properties of the soil such as swelling, porosity and water retention capacity, hydraulic conductivity, friability and modulus of rupture. It is suggested that the content of dispersible clay may be a useful quantitative characteristic of soils as it controls many other properties.


2021 ◽  
Vol 325 ◽  
pp. 174-180
Author(s):  
Martin Nguyen ◽  
Radomír Sokolář

This article examines the utilization of fly ash in comparison with alumina as raw materials and sources of aluminium oxide for synthesis of forsterite-spinel refractory ceramics. Raw materials were milled, mixed in different ratios into two sets of mixtures and sintered at 1500°C for 2 hours. Sintered samples were characterized by X-ray diffraction analysis and scanning electron microscopy. Samples were also subjected to determination of porosity, water absorption and bulk density. Thermal and thermomechanical properties were determined by thermal analyses, refractoriness, refractoriness under load, thermal shock resistance and thermal dilatometric analysis with determination of thermal expansion coefficient. Mixtures with 10 wt.% and 20 wt.% of fly ash had the most promising results compared to alumina mixtures. Thermal shock resistance and modulus of rupture were improving with increasing content of aluminium oxide in the mixture.


2009 ◽  
Vol 30 (6) ◽  
pp. 2269-2273 ◽  
Author(s):  
Fatih Yapici ◽  
Ayhan Ozcifci ◽  
Turgay Akbulut ◽  
Raif Bayir

2019 ◽  
Vol 16 (4) ◽  
pp. 213
Author(s):  
J.I. Arimanwa ◽  
D.O. Onwuka ◽  
M.C. Arimanwa ◽  
C.A. Ajoku

2021 ◽  
Vol 71 (4) ◽  
pp. 401-406
Author(s):  
Laya Khademibami ◽  
Alan Sherrington ◽  
Rubin Shmulsky ◽  
Franklin Quin

Abstract In this research, flexural properties of mill-run, in-grade red and white oak lumber from a single mill and commercially available laminated hardwood composite were evaluated. Structurally graded green (wet) freshly sawn red and white oak 5 by 10-cm (2 by 4-in) nominal lumber as well as glue-laminated hardwood composite billets were tested in bending and their modulus of rupture (MOR) and modulus of elasticity (MOE) properties were developed. It is well documented that MOR and MOE are two major indicators to evaluate flexural strength of wood lumbers. From these data, summary statistics, design values, and mean separations were calculated and reported. Overall, the red and white oak lumber performed similarly to structural No. 2 grade material. The hardwood composite billets were highly uniform. Each of the three materials demonstrated a reasonably good relationship between MOE and MOR, thereby suggesting that MOE could be used as a selection criterion for strength in a commercial use situation.


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