Minor-destructive (MDT) and non-destructive (NDT) techniques are not commonly used for masonry as they are complex and difficult to perform. This paper describes validation of the following methods: semi-non-destructive, non-destructive, and ultrasonic technique for autoclaved aerated concrete (AAC). The subject of this study covers the compressive strength of AAC test elements with declared various density classes of: 400, 500, 600, and 700 (kg/m3), at various moisture levels. Empirical data including the shape and size of specimens, were established from tests on 494 cylindrical and cuboid specimens, and standard cube specimens 100 mm × 100 mm × 100 mm using the general relationship for ordinary concrete (Neville’s curve). The effect of moisture on AAC was taken into account while determining the strength fBw for 127 standard specimens tested at different levels of water content (w = 100%, 67%, 33%, 23%, and 10%). Defined empirical relations were suitable to correct the compressive strength of dry specimens. For 91 specimens 100 mm × 100 mm × 100 mm, the P-wave velocity cp was tested with the transmission method using the ultrasonic pulse velocity method with exponential transducers. The curve (fBw–cp) for determining the compressive strength of AAC elements with any moisture level (fBw) was established. The developed methods turned out to be statistically significant and can be successfully applied during in-situ tests. Semi-non-destructive testing can be used independently, whereas the non-destructive technique can be only applied when the developed curve fbw–cp is scaled.

No abstract

No abstract

No abstract

Cop~ht 1995, Sodefy of Petroleum Engineers, Inc.This paper wee prepared for presentation at the Western Regionei Meeting held in Bakersfield, CA, U.S.A., 8-10 March 1~5, This paper wee eafacfed for preaentatlon by an SPE Progrem timmiffee following review of information confeined in an absfraot submnted by the autfwr(e). Contenfe of the paper, se Waaanted, have not bean retiewed by the Sooiefy of Petroleum Engineers and are eubjact to correction by the aufhqs).The material, as presented, does not naceeeerlly reflect any position of the Sooikfy of Petroleum Engineere, ite officers, or members. Papera presented at SPE meetings era subject to pubikation review by Editorial Commhtees of the society of Pefrofaum Engineers. Parmkeebn to copy is rearrkfed to an ebatracf of nof rnc+e than S00 words, Illuetratbrra may not be oopiad. The abstract ahoufd oontain mrtepkuous eckn-gnwnt of where and by Wrom the peper is preeenterl Write Librerian, SPE,

This paper present results from testing shape and dimensions of specimens on compressive strength of autoclaved aerated concrete (AAC) concrete with nominal density classes 400, 500, 600, and 700. The tests were conducted on standard cube specimens 100 mm × 100 mm × 100 mm, cylindrical and rectangular specimens made of AAC blocks. DANTEC optical measurement system was used to analyze how specimen shape affected the mechanism of specimen destruction. Obtained results were analyzed and Neville's algorithm was adapted. K E Y W O R D Sautoclaved aerated concrete, compressive strength, shape and size specimen

No abstract

Abstract:The work presents the results of tests on the shear parameters of walls made of AAC (autoclaved aerated concrete, f b = 4.0 N/mm 2 ) on the system mortar for thin M5 and M10 joints (f m = 6.1 N/mm 2 and f m = 11.9 N/mm 2 ) and on polyurethane glue and also walls without mortar (dry masonry). The wall compression strength (on mortar M5 class) (per EN 1052(per EN -1:2000 amounted to f c,mv = 2.97 N/mm 2 (f k = 2.48 N/mm 2 ), elastic modulus was E cm = 2,040 N/mm 2 . Various structure of bed joints and head joints were applied and the following were used as reinforcement: steel trusses of EFZ 140/Z 140 type (Z1 type) and meshes made of plastics (Z2 type). Based on the tests carried out with regard to unreinforced elements, it was shown that the filling in of head joints with mortar had an advantageous effect on the values of cracking and destruction stresses. While, with the use of reinforcement, advantageous increase of stress was obtained only when the mortar was laid twice on both bed surfaces of masonry units. The application of reinforcement in the bed joints when the mortar was laid only on one bed joints surface of the masonry units reduced the values of cracking and destruction stresses in relation to the values obtained in the unreinforced walls.