化学激发淤泥焚烧灰制备生态透水砖性能研究

Performance of ecological permeable bricks prepared from chemically activated sludge incineration ash

通过CaO、NaOH、NaAlO2和Na2SiO3激发淤泥焚烧灰化学活性后与水泥复合作为胶凝材料制备生态透水砖,通过正交试验研究了不同化学激发剂对水泥净浆抗压强度的影响,探究了骨胶比对淤泥焚烧灰制备的生态透水砖劈裂抗拉强度、渗透性、抗冻性及保水性的影响。结果表明:复合化学激发剂可以改善淤泥焚烧灰制备的生态透水砖的力学性能,但将降低淤泥焚烧灰制备的生态透水砖的透水性、保水性。骨胶比与透水砖的透水系数呈正相关,当骨胶比从3.0增大到3.4时,未掺淤泥焚烧灰的对照组透水系数增大了153%,掺淤泥焚烧灰的试验组透水系数增大了184%。为满足工程要求,淤泥焚烧灰的掺量不宜超过30%。

Ecological permeable bricks were prepared by using CaO,NaOH,NaAlO2,and Na2SiO3 to stimulate the chemical activity of sludge incineration ash and then compounded with cement as a cementitious material.The influence of different chemical activators on the compressive strength of cement paste was studied through orthogonal experiments,and the influence of aggregate cement ratio on the splitting tensile strength,permeability,frost resistance,and water retention of ecological permeable bricks prepared from sludge incineration ash was explored.The results show that composite chemical activators can improve the mechanical properties of ecological permeable bricks prepared from sludge incineration ash,but will reduce its permeability and water retention.The aggregate cement ratio is positively correlated with the permeability coefficient of permeable bricks.When the aggregate cement ratio increases from 3.0 to 3.4,the permeability coefficient of the control group without added sludge incineration ash increases by 153%,and the permeability coefficient of the experimental group with added sludge incineration ash increases by 184%.To meet the engineering requirements,the dosage of sludge incineration ash should not exceed 30%.