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首页> 外文期刊>Arabian Journal for Science and Engineering >Effect of Combined Supplementary Cementitious Materials on the Fresh and Mechanical Properties of Eco‑Efficient Self‑Compacting Concrete
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Effect of Combined Supplementary Cementitious Materials on the Fresh and Mechanical Properties of Eco‑Efficient Self‑Compacting Concrete

机译：组合胶凝材料对生态效率自控混凝土新鲜机械性能的影响

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摘要

Global concrete demand is causing depletion of natural resources at an alarming rate. Self-compacting concrete (SCC) is an innovative solution as it uses less aggregates; however, the drawback of SCC is that high cement content is required compared to conventional concrete. Considering that cement production emits 7% of carbon dioxide ( CO_2) gas emissions, the use of high content of cement in SCC production is concerning. Though the high powder content of SCC may be of a concern, however, it allows the opportunity to substitute the cement content with supplementary cementitious materials. This experimental work was therefore conducted to reduce the cement content by substituting it with waste materials, such as eggshell powder (ESP) and palm oil fuel ash (POFA), and develop an eco-efficient SCC. The cement content was partially substituted by 0 to 5% ESP and 0 to 15% POFA by weight of total binder. A total of 90 cubes of 100 mm and 60 cylinders of 100 × 200 mm dimension were prepared to evaluate the compressive and splitting tensile strengths, modulus of elasticity, and Poisson’s ratio. Furthermore, the environmental impact assessment was conducted to assess the embodied CO_2 and eco-strength efficiency of the developed eco-efficient SCC. It was found that the combination of POFA and ESP increased pozzolanic reactivity, developing additional calcium silicate hydrate gels, thus increasing strength. The combination of 2.5% ESP and 5% POFA (a total of 7.5% cement substitution) was deemed to be the optimal combination as it provided better strength in SCC after 28 days of curing, which leads to 9.66% higher compressive strength than the control SCC. Furthermore, the developed SCC was observed to be eco-friendly as it reduced embodied carbon ranging from 3.86 to 15.33% and eco-efficiency ranging from 2.38 to 15.48% on 28 days compared to the control SCC.
机译：全球具体需求以惊人的速度造成自然资源的消耗。自压力混凝土（SCC）是一种创新的解决方案，因为它使用的聚集体较少;然而，与常规混凝土相比，SCC的缺点是需要高水泥含量。考虑到水泥生产发出7％的二氧化碳（CO_2）气体排放，SCC生产中使用高含量的水泥致作用。虽然SCC的高粉末含量可能是关注的，但是它允许有机会用补充水泥材料替换水泥含量。因此，通过用废料代替蛋壳粉（ESP）和棕榈油燃料灰（POFA）来减少水泥含量，以减少水泥含量，并开发生态效率的SCC。水泥含量将0至5％ESP和0至15％POFA的总粘合剂的重量分取出。准备总共90立方数100毫米和60个圆柱体，以评估压缩和分裂拉伸强度，弹性模量和泊松比。此外，进行了环境影响评估，以评估发达的生态效率SCC的体现CO_2和生态强度效率。发现POFA和ESP的组合增加了Pozzolanic反应性，显影含有含有硅酸钙水合物凝胶，从而增加强度。 2.5％ESP和5％POFA的组合（共7.5％的水泥替代）被认为是最佳组合，因为它在固化后28天的SCC提供更好的强度，这导致抗压强度高于控制的9.66％ SCC。此外，观察到发育的SCC是生态友好的，因为它减少了3.86％至15.33％，与对照SCC相比为28天的2.38〜15.48％的生态效率降低。

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