A Study of the Size Effect of High-strength Reactive Powder Concrete
Reactive powder concrete(RPC)is a new type of high-strength cement-based composite with excellent mechanical properties and durability.But size effect phenomenon also exist in RPC,like ordinary concrete,and this effect is directly related to its true strength,carrying capacity and assessment of structural durability,etc..In the experiment,the size of the specimen as a variable,7 d and 28 dcompressive strength value of the four groups of specimens of different sizes were obtained,and statistical analysis methods were applied to study the strength of the size effect of the RPC specimen.Reference to the compressive strength of the side length of 100 mm cube specimens,for a side length of 70.7 mm and 40mm cube specimens,7 d and 28 d size effect coefficients were 0.961 3,0.953 5and 0.933 5,0.935 6 respectively.For 40mm×40mm×160mm prism,relative to the side length 40mm cube specimen,its size effect coefficient of 28 d was 0.832 4.RPC is a relatively homogeneous material.After adding steel fiber in the RPC,the toughness increases,and the brittleness decreases.Through a comparative analysis,the strength size effect phenomenon of RPC is not so significant as ordinary concrete.