| The Combined Aggregate Concrete is new Building materials,in which the light aggregate ,to some extent ,replaces the common aggregate and belongs to middle and hign-strength concrete.The density of Combined Aggregate Concrete varies between 1800kg/m3-2200kg/m3 and the strength of that alters between 40MPa-80MPa[1].Nowdays,it is comprehensively utilized in bridge constructions,fly-past constructions,especially marine structures and so on.In spite of wide use of common concrete , The disadvantages of it has restricted its development.and the light aggregate concrete also includes some negtive aspects that its strength is relatively low yet its shrinkage and creep is relatively high. The Combined Aggregate Concrete, as the transition between high and common concrete, combines the high and common concrete's advantages above instead of changing the mechanical property of them. Its use will be greatly develeped in future.Our experimental study includes the study on materials and structural members.Based on the compression test, the elastic modulus of that,which is affected by the proportion between light and common aggregate and water cement ratio, is studied in the test of buliding matrials. The result show that the influence on elastic modulus of combined aggregate concrete varies remarkably, with different proportions between light and common aggregate and the elastic modulus of combined aggregate concrete raises increasingly with the drop of water cement ratio. Based on the study on materials, the test of structural members are designed .The study about structural members mainly discuss the shear behavior of oblique sction of Combined Aggregate Concrete Beams with the influence of the proportion between light and common aggregate. and the formula related to the shear capacity of Combined Aggregate Concrete Beams is proposed and recommended on the base of a great deal of analysis of test data. We expect this paper can provide some mind for the next study,design and constuction and so on. |
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