Chemical Characterization of Nine Locally Made Cement Products for Quality Assurance in Nigeria Cement Industry

S. A. Odewale, A. A. Oladunni, B. O. Oyewale
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Abstract

Chemical characterization of Portland limestone cement products collected across the nine existing cement manufacturing plants in Nigeria was conducted using Energy Dispersive X-ray Fluorescence Spectrometer (EDXRF) with the aim of determining conformity with global and local standards and investigating likely variation in quality resulting from differences in the sources of major raw materials, especially limestone used in production. The cement samples are composed essentially of CaO, SiO2, Al2O3, Fe2O3, MgO, Na2O, K2O and SO3 while P2O5, MnO and TiO2 were present in trace amount. In addition to oxide compositions, the mineralogical components: Alite (C3S), Belite (C2S), Celite (C3A), and Ferrite (C4AF), and other cement quality control variables such as Lime Saturation Factor, Silica Modulus and Alumina Modulus of all the nine cement samples analyzed in this study are in agreement with the specifications for Portland limestone cement published by the Standard Organisation of Nigeria (SON), the American Society for Testing and Materials (ASTM), and the British Standards Institution (BSI). The nine cement products also have their compositions in close proportion indicating none of the products is superior in quality irrespective of manufacturer or production site, a common misconception in the Nigerian cement market.
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为保证尼日利亚水泥工业的质量,对九种本地水泥产品的化学特性进行了分析
利用能量色散x射线荧光光谱仪(EDXRF)对尼日利亚现有9家水泥生产厂收集的波特兰石灰石水泥产品进行了化学表征,目的是确定是否符合全球和当地标准,并调查由于主要原材料,特别是生产中使用的石灰石来源不同而可能产生的质量差异。水泥样品主要由CaO、SiO2、Al2O3、Fe2O3、MgO、Na2O、K2O和SO3组成,微量存在P2O5、MnO和TiO2。除氧化物成分外,矿物成分:本研究分析的所有9种水泥样品的Alite (C3S)、Belite (C2S)、Celite (C3A)和Ferrite (C4AF)以及其他水泥质量控制变量,如石灰饱和系数、二氧化硅模量和氧化铝模量,均与尼日利亚标准组织(SON)、美国测试与材料协会(ASTM)和英国标准协会(BSI)发布的波特兰石灰石水泥规范一致。这九种水泥产品的成分比例相近,表明无论制造商或生产地点如何,没有一种产品质量优越,这是尼日利亚水泥市场上常见的误解。
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