用污泥建筑垃圾研制免烧砖的实验研究  

Experimental Study on No-roasting Bricks Made from Sludge and Building Rubbish

作　　者：徐子芳[1] 张明旭[1] 李金华[1] 

机构地区：[1]安徽理工大学材料科学与工程学院,安徽淮南232001

出　　处：《非金属矿》2011年第5期11-14,共4页Non-Metallic Mines

基　　金：国家自然基金项目(10872001);2010年安徽理工大学博士基金项目(2010YC001)

摘　　要：为了有效利用固体废物开发新型建筑材料,基于正交实验原理,采用建筑垃圾、污泥、粉煤灰、脱硫石膏为主要原料来制备免烧砖。除进行宏观物理性能测试外,运用XRD、TGA–DTA、SEM等手段研究了免烧砖的相组成、显微结构及微观形貌。结果表明:免烧砖最佳配比为建筑垃圾60%、污泥2%、粉煤灰15%时,抗压强度为11.75 MPa,达到粉煤灰砖MU10标准;导热系数为0.205 W/(m.K),低于普通黏土砖0.78 W/(m.K)。同时发现试块水化过程中产生了多种水化产物:水化铝酸钙、水化硅酸钙(C-S-H)、钙矾石(AFt)、氢氧化钙(CH)和托勃莫来石等,这些产物的形成有利于提高免烧砖的耐久与耐候性能。In order to use solid waste to develop new building materials effectively, based on orthogonal experiment principle, building rubbish, sludge, fly ash and gypsum were used as main raw materials to prepare the no-roasting bricks. Except macroscopic physical properties were investigated.The phase compositions, microstructure and morphologies of no-roasting bricks were studied via analysis ways of XRD（X-ray diffraction）,SEM （Scanning electron microscope） and TGA-DTA （Thermogravimetric-differential thermal analysis）.The results show that when the ratio of building rubbish to sludge and fly ash is 60% ： 2% ： 15%, compressive strength is 11.75 MPa, reaching fly ash brick MU10 level. Thermal conductivity is 0.205 W/（m.K）, lower than 0.78 W/（m.K） of general clay bricks. Many kinds of hydrated products are finded such as hydrated calcium aluminate, hydrated calcium silicate （C-S-H）, ettringite （AFt）, calcium hydroxide （CH）, tobermorite and so on, which help to improve the no-roasting bricks lasting quality and weatherability.

关 键 词：建筑垃圾 污泥 免烧砖 物理性能 显微结构 

分 类 号：X799.1[环境科学与工程—环境工程] TU522[建筑科学—建筑技术科学]