云南腾冲火山石制备轻质透水混凝土的试验研究
Experimental Study on Preparation of Lightweight Pervious Concrete Using Tengchong Volcanic Stone in Yunnan Province

以轻质多孔的云南腾冲火山石为骨料制备轻质透水混凝土，采用体积法进行配合比设计。通过正交试验方法，研究水灰比、有效孔隙率，火山石粒径、硅灰比例等诸多因素对28 d龄期的混凝土抗压力性、透水系数的影响规律。试验结果表明：使用火山石为轻型集料能够制备性能较好的轻质混凝土；当孔隙率为17%，水胶比0.30，骨料粒径为5 mm~8 mm，硅灰掺量5%左右，增强剂掺量为10%到15%之间的情形，试块抗压强度达到最大值25 MPa，透水系数大于3 mm/s，能够基本符合透水混凝土路面的压强标准和透水特性指标，具有良好的经济和生态效益。
A lightweight permeable concrete was prepared using lightweight and porous Yunnan Tengchong volcanic rock as aggregate, and the mix design was carried out using the volume method. Through the orthogonal test method, the influence of many factors, such as Water–cement ratio, effective porosity, volcanic stone particle size, silica fume ratio, and so on, on the pressure resistance and water permeability coefficient of concrete at the age of 28 days was studied. The experimental results indicate that using volcanic stone as a lightweight aggregate can prepare lightweight concrete with good performance. When the porosity is 17%, the water-cement ratio is 0.30, the aggregate particle size is 5 mm~8 mm, the silica fume content is about 5%, and the reinforcing agent content is between 10% and 15%, the compressive strength of the test block reaches the maximum value of 25 MPa, and the permeability coefficient is greater than 3 mm/s. It can basically meet the pressure standards and permeability characteristics indicators of permeable concrete pavement, and has good economic and ecological benefits.