Additional water use influencing strength and fluidity of recycled concrete

Abstract

Through adding different additional water use, the compressive strength, splitting tensile strength and fluidity of recycled concrete of three aggregate combination forms were studied by experiment respectively. The experimental results show that with the increase of adding additional water use, the compressive strength and splitting tensile strength of recycled coarse aggregate concrete decrease, but that of recycled fine aggregate concrete and recycled all aggregate concrete increase firstly then decrease. When additional water use is added more 15% or 20% than that of basic ordinary concrete, the recycled coarse aggregate concrete and fine one can get pretty good fluidity. When it is added more 30%, the recycled all aggregate concrete has fluidity that is just satisfied.

Experimental Study on Performance Optimization of Grouting Backfill Material Based on Mechanically Ground Coal Gangue Utilizing Urea and Quicklime

“…For grouting materials, the slurry is supposed to exhibit good workability for convenient transport to target the filling position [ 27 ]. Excess water is usually needed to improve transportability but resulting in drainage increase and concretion rate decrease [ 28 , 29 ]. Alternatively, the addition of a chemical superplasticizer (SP) helps to reduce water demand for a better workability [ 28 , 30 ].…”

Effect of some Key Factors on the Strength of Recycled Concrete

“…It has very important guiding action for the recycled concrete mix design and optimization to clear the main factors and fundamental law influencing the recycled concrete strength [1][2][3]. The substitute ratio of recycled aggregate and water cement ratio are the key factors influencing the strength of the recycled concrete.…”

Experimental Study on the Splitting Tensile Strength of Recycled Sintered Brick-Tile Concrete

“…The concrete using part or full of the recycled brick-tile aggregate was recycled concrete [hereinafter referred to as "recycled brick concrete"], which was a green building material with the characteristic of sustainable development. Currently, more and more studies have been paid to the properties of recycled concrete aggregate at home and abroad [5,6,7], but the research on recycled brick concrete was still less. In this paper, splitting tensile strength experiments of recycled brick concrete with different water-cement ratio, sand rate and water quantity [8]were carried out, and the change law of splitting tensile strength with above three factors were acquired and failure patterns of the samples were analyzed.…”