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Strength of lime-fly ash compacts using different curing techniques and gypsum additive

机译：采用不同固化技术和石膏添加剂的粉煤灰压块强度

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摘要

Lime-fly ash mixtures are exploited for the manufacture of fly ash bricks finding applications in load bearing masonry. Lime-pozzolana reactions take place at a slow pace under ambient temperature conditions and hence very long curing durations are required to achieve meaningful strength values. The present investigation examines the improvements in strength development in lime-fly ash compacts through low temperature steam curing and use of additives like gypsum. Results of density-strength-moulding water content relationships, influence of lime-fly ash ratio, steam curing and role of gypsum on strength development, and characteristics of compacted lime-fly ash-gypsum bricks have been discussed. The test results reveal that (a) strength increases with increase in density irrespective of lime content, type of curing and moulding water content, (b) optimum lime-fly ash ratio yielding maximum strength is about 0.75 in the normal curing conditions, (c) 24 h of steam curing (at 80°C) is sufficient to achieve nearly possible maximum strength, (d) optimum gypsum content yielding maximum compres-sive strength is at 2%, (e) with gypsum additive it is possible to obtain lime-fly ash bricks or blocks having sufficient strength (>10 MPa) at 28 days of normal wet burlap curing.
机译：石灰-粉煤灰混合物被用于制造粉煤灰砖，从而在承重砖石中找到了应用。石灰-火山灰反应在环境温度条件下以缓慢的速度发生，因此需要非常长的固化时间才能达到有意义的强度值。本研究调查了通过低温蒸汽固化和使用石膏等添加剂在石灰粉煤灰压块中强度发展的改进。讨论了密度-强度-模塑水含量关系，石灰-粉煤灰比，蒸汽养护和石膏对强度发展的影响以及压实的石灰-粉煤灰-石膏砖的特性的结果。测试结果表明（a）强度随密度的增加而增加，而与石灰含量，固化类型和成型水含量无关，（b）在正常固化条件下产生最大强度的最佳粉煤灰比约为0.75，（c ）24小时的蒸汽固化（在80°C下）足以获得几乎可能的最大强度，（d）产生最大抗压强度的最佳石膏含量为2％，（e）使用石膏添加剂可以得到石灰粉煤灰砖或砌块在正常的湿粗麻布固化28天后具有足够的强度（> 10 MPa）。

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