VARIATIONS IN CONCRETE QUALITY PRODUCED FROM A BLEND OF CLAY-BASED CONCRETE ADMIXTURES AND MULTIPLE ADDITIVES FOR STRUCTURAL APPLICATIONS

Akanu-Ibiam Effiong Ndon, A. Ikpe
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Abstract

The present study examines the variation in the quality of concretes (in terms of compressive strength) produced from a blend of clay-based concrete admixtures and multiple additives using standard test methods such as slump test, concrete cube test, curing duration etc. It was observed that for control samples with no clay and high clay content at 7, 14, and 28 days of curing, the average compressive strengths were 21.05, 22.13, 30.62 and 13.57,14.26 21.49N/mm. For periwinkle shell ash and superplasticizer (conplastSP430) combined together at 7, 14 and 28 days at 5%, the compressive strength were 26.06, 24.76 and 27.52N/mm. Similarly for Rice husk ash and Hydrated Lime combined together at 7, 14, and 28 days at 5%, the compressive strength were 29.47, 29.02 and 31.52N/mm. For all additives combined together at 5% and 2.5% each at 7, 14 and 28 days, the compressive strengths were 11.15, 15.52, 20.64 and 18.11, 22.79. 25.68N/mm respectively. However, superplasticizer (conplastSP430) at 10% yielded the highest compressive strength of 30.78, 33.48, and 35.72 at 7, 14, and 28 days curing. This implies that concrete with high clay content possess low compressive strength as well as low quality which is not suitable for structural applications, in which case can be improved to satisfactory levels and percentages when combined with additives at adequate curing durations and mix ratios.
由粘土基混凝土外加剂和结构应用的多种添加剂混合产生的混凝土质量的变化
本研究采用坍落度试验、混凝土立方体试验、养护时间等标准试验方法,考察了粘土基混凝土外加剂和多种添加剂混合后混凝土质量(按抗压强度计算)的变化。结果表明:无粘土和高粘土含量对照试件在养护7、14、28 d时的平均抗压强度分别为21.05、22.13、30.62和13.57、14.26、21.49N/mm;紫花螺壳灰分与高效减水剂conplastSP430在5%浓度下分别在7、14和28 d时的抗压强度分别为26.06、24.76和27.52N/mm。稻壳灰分与水合石灰在5%浓度下复合7、14和28 d时,抗压强度分别为29.47、29.02和31.52N/mm。当添加量分别为5%和2.5%时,第7、14和28天的抗压强度分别为11.15、15.52、20.64和18.11、22.79。分别为25.68 n /毫米。然而,10%的高效减水剂(conplassp430)在养护7、14和28天时的抗压强度最高,分别为30.78、33.48和35.72。这意味着高粘土含量的混凝土具有低抗压强度和低质量,不适合结构应用,在这种情况下,当与添加剂结合在适当的养护时间和混合比下,可以提高到令人满意的水平和百分比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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