不同因素对再生混凝土抗压强度的影响

Effect of Different Factors on Compressive Strength of Recycled Concrete

以正交实验的方法制作16组再生混凝土立方体试块进行抗压实验,主要研究水胶比、再生粗骨料取代率、粉煤灰掺量及基体混凝土强度4个实验因素对再生混凝土28d抗压强度的影响。实验结果表明,4个因素在0.05及0.10显著性水平上对再生混凝土抗压强度的影响显著,其中水胶比是影响再生混凝土28d抗压强度的关键因素。能够使再生混凝土28d抗压强度达到最优的组合为:水胶比取0.40,再生粗骨料取代率为100%,粉煤灰掺加量取0,基体混凝土强度等级为C50。

Based on the orthogonal experiment method,16 groups of recycled concrete cubes for compressive experiment were prepared.The effect of water-binder ratio,recycled coarse aggregate concrete,dosage of fly ash and concrete matrix strength on 28 d compressive strength of recycled concrete were investigated.The experimental results show that the four factors have a significant effect on the compressive strength of recycled concrete at the significance levels of 0.05 and 0.10,in which the water-binder ratio is the key influence factor on 28 d compressive strength of the recycled concrete.The best combination of compressive strength of recycled concrete is 0.40,the ratio of recycled coarse aggregate is 100%,the content of fly ash is 0,and the strength of matrix concrete is C50.