页岩陶粒植生型多孔混凝土制备与植生试验研究

Shale Ceramsite Porous Concrete for Plant Growing:Preparation and Planting Test

为了研究页岩陶粒的颗粒级配对植生型多孔混凝土密度、抗压强度、空隙率以及内部空隙p H值的影响,设置2种页岩陶粒颗粒级配,测其堆积密度、表观密度、空隙率和吸水率等基本物理性质,对页岩陶粒进行植生型多孔混凝土的配合比设计计算。黄棕壤土中掺杂适量的粉煤灰、复合肥、Fe SO4和醋酸乙烯乳液制成改性土壤,改性土壤、腐殖质、蛭石粉末按2∶2∶1的比例加水调成流动度为210~240 mm的种植基质浆体,采用上置式和中置式2种种植构造进行植生试验。结果表明:12组植生型多孔混凝土的密度随颗粒级配和设计目标空隙率的变化在600~800 kg/m3之间变化,28 d龄期的混凝土抗压强度在5 MPa以上,内部空隙部位的p H值在11~12之间;配制的种植基质取得了良好的植生效果,在必要的养护和管理条件下,植物完全可以在2种种植构造中健康地生长。

The aim of this research is to study the influence of grain size distribution of shale ceramsite on the bulk density,compressive strength,void ratio and p H value in the internal voids of porous concrete for plant growing.First of all,we set up two groups of grain size distribution of shale ceramsite,and measured the basic physical properties such as stack density,apparent density,void ratio and bibulous rate for mixture proportion design. Furthermore,we added fly ash,compound fertilizer,Fe SO4 and vinyl acetate emulsion into yellow brown loam to prepare modified soil,which was further mixed with humus and vermiculite powder in a proportion of 2 ∶2 ∶1 to obtain planting substrate flurry of a fluidity of 210-240 mm. Then we carried out planting tests with two planting structures:a. seeds in humus overhead the porous concrete; b. seeds in substrate among voids of the porous concrete. Test results showed that with the changes of grain size distribution and target void ratio,the bulk density of 12 groups of porous concrete varied between 600-800 kg/m3; compressive strength of the porous concrete at the age of 28-day was above 5 MPa; and the p H value of internal voids between 11 to 12. Under necessary maintenance and management conditions,plants could completely grow well in the porous concrete,indicating that the mixture proportion of planting substrate is good.