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|標題:||Determination of the dividing strength and its relation to the concrete strength in lightweight aggregate concrete||作者:||Chen, H.J.
|關鍵字:||lightweight aggregate;lightweight aggregate concrete;dividing strength||Project:||Cement & Concrete Composites||期刊/報告no：:||Cement & Concrete Composites, Volume 21, Issue 1, Page(s) 29-37.||摘要:||
As concrete is considered to be a composite material consisting of mortar and coarse aggregate, its strength depends on the mortar strength and coarse aggregate strength. During the strength development stage of a lightweight aggregate concrete, a critical condition, under which the type of stress distribution changes, occurs as the values of the modulus of elasticity of the lightweight aggregate and mortar become the same. The concrete strength corresponding to this instant is named 'Dividing Strength (F-G)' by Weigler & Karl (Stahlleichtbeton, 1972, pp. 38-43) . A series of specimens consisting of 252 concrete cylinders (100 phi x 200 mm) and 252 mortar cubes (50 x 50 x 50 mm) were made and subjected to compression tests. From the obtained mortar-concrete strength relationship, we were able to identify a dividing strength for a lightweight aggregate concrete made with a 0.4 water/cement ratio. The test data also show that both particle density and particle sizes of lightweight aggregate are governing factors for the dividing strength. The concept of a dividing strength can be utilized to optimize a mix design for lightweight aggregate concrete. For instance, concrete that has a designed compressive strength much greater than its dividing strength may consume too much cement and resulting to wasteful cement consumption. (C) 1999 Elsevier Science Ltd. All rights reserved.
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