外掺硅粉混凝土早龄期强度及弹性模量试验研究

为了研究外掺硅粉混凝土早龄期的抗压强度及弹性模量,以不同硅粉掺量及时间龄期为变化参数,共设计并完了168个棱柱体试块的静力加载试验。观察了试件的破坏形态,获取了外掺硅粉混凝土早龄期抗压强度及变形等关键特征参数,揭示了外掺硅粉对混凝土早龄期强度和弹性模量影响的变化规律。研究结果表明:外掺硅粉可细化混凝土内部的孔结构,减少骨料与水胶体间的孔隙率,增加混凝土的密实度,从而有效提高混凝土的早期强度和弹性模量;当外掺硅粉掺量为1.4%对混凝土力学性能的提高最显著,其中3 d强度提高了35%,弹性模量提高了62.7%。

Experimental study on mechanical properties of concrete with adding steel fiber at early age

In order to study the compressive strength and elastic modulus of concrete mixed with silica powder at the early age,a total of168 prismatic test blocks were designed and completed by taking different silica powder content and time age as changing parameters.The failure modes of specimens were observed,and the key characteristic parameters such as compressive strength and deformation of concrete at early age were obtained,and the variation rules of influence of silica powder on concrete at early age strength and elastic modulus were revealed.The results show that the addition of silica powder can refine the pore structure of concrete,reduce the porosity between aggregate and hydrocolloid,and increase the compactness of concrete,so as to effectively improve the early strength and elastic modulus of concrete.When the content of silicon powder is 1.4%,the performance of concrete is most significantly improved,among which the 3 d strength is increased by about 35%,and the elastic modulus is increased by about 62.7%.