基于正交试验设计的发泡聚苯乙烯混凝土强度研究

发泡聚苯乙烯混凝土具有应用于地上地面和地下工程的潜力,但由于发泡聚苯乙烯自身具有疏水性,在制备过程中容易发生浮起,因此其强度无法得到良好控制。为此,基于制备及抗压强度试验,采用正交试验设计表L18(37)分析了水灰比、颗粒掺量比、高效减水剂用量、添加剂Ⅰ、Ⅱ用量、砂率、纤维含量的不同配合比对发泡聚苯乙烯混凝土抗压强度的影响。试验结果表明,水灰比和颗粒掺量比是影响发泡聚苯乙烯混凝土抗压强度的两个关键因素。为得到聚苯乙烯膨胀混凝土的最佳抗压强度,基于方差分析提出了最优配合比,即当水灰比为0.3、颗粒掺量比为4∶1、高效减水剂用量为1.5%、添加剂Ⅰ为1%、添加剂Ⅱ为0.08%、砂率为32%、纤维含量为0.9 kg/m^3时,发泡聚苯乙烯混凝土的抗压强度大于35 MPa,达到满足地上地面及地下工程要求发泡聚苯乙烯混凝土的最佳状态。

Research on strength of foamed polystyrene concrete based on orthogonal design

Foamed polystyrene concrete has the potential to be used in ground and underground engineering,but its strength can not be well controlled because of its hydrophobicity and easy to float in the preparation process.Therefore,based on the preparation and compressive strength test,orthogonal test table L18(37)was used to analyze the influence of water cement ratio,particle content ratio,dosage of superplasticizer,dosage of additivesⅠandⅡ,sand ratio and fiber content on the compressive strength of foamed polystyrene concrete.The experimental results show that the water cement ratio and the particle content ratio are two key factors affecting the compressive strength of foamed polystyrene concrete.In order to obtain the optimum compressive strength of polystyrene expansive concrete,the optimum mix ratio was proposed based on variance analysis.When the water cement ratio was 0.3,the particle ratio was 4∶1,the dosage of superplasticizer was 1.5%,the additiveⅠwas 1%,the additiveⅡwas 0.08%,the sand ratio was 32%,and the fiber content was 0.9 kg/m^3,the foamed polystyrene concrete was prepared.The compressive strength of foamed polystyrene concrete is more than 35 MPa,which meets the requirements of ground and underground engineering.