Research On Compression Performance Of Columns Made With Recycled Concrete With Artificial Sand

With the rapid development of urbanization in our country, the concrete, brick building materials demand has soared, as the coarse aggregate concrete and fine aggregate supply shortages of the present; On the other hand, our country demand concrete aggregate is increasing at the same time tearing down the old building produce huge waste concrete. With the other members of the group in the regeneration of existing concrete test and theoretical results, based on study of the GuangXi is rich in limestone, the characteristics of the limestone will smash the characteristics of coarse aggregate will produce the limestone rock produces in the process of the waste gas material or artificial sand as fine aggregate replace natural sand, will break in the waste concrete as coarse aggregate instead of natural stone, sand preparation artificial regeneration concrete. In this paper the design strength grade10root for C35artificial sand of recycled concrete columns, and through the static load test pressure to the mechanical performance, this paper analyzes the long thin than and initial eccentricity two factors on artificial sand the damage form of recycled concrete column, failure mechanism, crack load and the influence of the ultimate bearing capacity. And the experimental results obtained with the reinforced concrete structure design codes2010"(hereinafter referred to as the new concrete rules) theoretical calculation are compared. Type specimens are:long fine than were6and8and10axial compression column3root; The initial eccentricity of30mm, long fine for6and10than are small eccentric column2root; The initial eccentricity for70mm, long fine for6and10than are the boundaries of the stress state of the column2root; The initial eccentricity for110mm long fine than were6and8and10big eccentric column3root.The results show that:the artificial sand regeneration concrete column in the eccentric loading to assume that when normal sections, the column of compressive mechanism and the damage form and general concrete column is similar; In the initial eccentricity the same circumstances, artificial sand specimens of recycled concrete crack load and limit bearing capacity of the long thin than with the increase of the lower; In the long thin than the same circumstances, artificial sand specimens of recycled concrete crack load and limit bearing capacity and with the increase of the initial eccentricity and reduce; When the axial compression, artificial sand recycled concrete specimens cracking load and limit bearing capacity of the long thin than with the increase of the reduced. In this article, the new concrete rules related calculation of the specimen cracking load and limit bearing capacity and the maximum crack width artificial sand in the applicability of recycled concrete column. And will work out new concrete rules the theoretical and experimental value is compared, and contrast sand that artificial regeneration concrete column cracking of ultimate bearing capacity and maximum bending moment, crack width can use new concrete rules to calculate. Of course in the use of the current specification calculation fonnula, one of the concrete and steel reinforced material parameters (EC, E0, ε0, fc and ft) is to use this experiment and with other members of the group of the research results of the calculation.