Department of Civil Engineering, UFSCar, Via Washington Luis, km 235, Monjolinho, 13565-905 São Carlos, SP, Brazil.
Waste Manag. 2010 Jun;30(6):1114-22. doi: 10.1016/j.wasman.2010.01.026. Epub 2010 Feb 18.
Sugarcane today plays a major role in the worldwide economy, and Brazil is the leading producer of sugar and alcohol, which are important international commodities. The production process generates bagasse as a waste, which is used as fuel to stoke boilers that produce steam for electricity cogeneration. The final product of this burning is residual sugarcane bagasse ash (SBA), which is normally used as fertilizer in sugarcane plantations. Ash stands out among agroindustrial wastes because it results from energy generating processes. Many types of ash do not have hydraulic or pozzolanic reactivity, but can be used in civil construction as inert materials. The present study used ash collected from four sugar mills in the region of São Carlos, SP, Brazil, which is one of the world's largest producers of sugarcane. The ash samples were subjected to chemical characterization, sieve analysis, determination of specific gravity, X-ray diffraction, scanning electron microscopy, and solubilization and leaching tests. Mortars and concretes with SBA as sand replacement were produced and tests were carried out: compressive strength, tensile strength and elastic modulus. The results indicated that the SBA samples presented physical properties similar to those of natural sand. Several heavy metals were found in the SBA samples, indicating the need to restrict its use as a fertilizer. The mortars produced with SBA in place of sand showed better mechanical results than the reference samples. SBA can be used as a partial substitute of sand in concretes made with cement slag-modified Portland cement.
甘蔗在全球经济中扮演着重要的角色，巴西是糖和酒精的主要生产国，糖和酒精是重要的国际商品。生产过程会产生甘蔗渣作为废物，可用作燃料来启动锅炉，产生蒸汽用于热电联产。这种燃烧的最终产物是残余的甘蔗渣灰（SBA），通常用作甘蔗种植园的肥料。灰分在农业工业废物中很突出，因为它是能源产生过程的产物。许多类型的灰分没有水硬或火山灰活性，但可作为惰性材料用于土木工程。本研究使用了来自巴西圣卡塔琳娜州四个糖厂的灰分，该地区是世界上最大的甘蔗生产地之一。对灰分样本进行了化学特性、筛分分析、比重测定、X 射线衍射、扫描电子显微镜以及溶解和浸出试验。用 SBA 替代砂生产了砂浆和混凝土，并进行了抗压强度、抗拉强度和弹性模量测试。结果表明，SBA 样本的物理性质与天然砂相似。SBA 样本中发现了几种重金属，表明需要限制其作为肥料的使用。用 SBA 代替砂生产的砂浆比参考样本具有更好的力学性能。SBA 可用于部分替代波特兰水泥矿渣改性水泥混凝土中的砂。
