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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Optimization of superplasticizer dosage for cementitious suspension involved in high shear applications
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Optimization of superplasticizer dosage for cementitious suspension involved in high shear applications

机译：高剪切应用涉及水泥悬浮液的优化剂量优化

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摘要

The dosage of superplasticizer ( SP) plays a vital role in influencing the behaviour of fresh concrete through cementitious paste. For optimizing the SP dosage, generally empirical tests like mini-slump and Marsh cone are adopted. However, they do not capture the requirement of suitable SP dosage for processes involving high shear energy like pumping. Recent studies have shown that SP, especially polycarboxylate ether/esters (PCE)-based, influences the shear thickening behaviour of cement-based pastes. The addition of PCE at higher dosage, decreases the apparent viscosity by de-flocculation of cement paste. However, at increased shear forces, the reaggregation results in early onset of shear thickening and also increases its intensity, thus affecting the pumping process. On the other hand, the commercially available, site-specific PCE and the prescriptive SP dosages complicate the problem. The above problem necessitates the need to understand the mechanism behind the action of PCE on shear thickening of cement pastes experiencing high shear energy process. In this regard, it is rational to optimize the SP dosage based on shear rates (corresponding to applications) through rheological studies rather than empirical tests.
机译：超塑料（SP）的剂量在影响新混凝土通过水泥浆料中起着至关重要的作用。为了优化SP剂量，通常采用迷你坍落度和沼泽锥体等经验测试。然而，它们不会捕获适合于涉及泵送的高剪切能量的方法的适当SP剂量。最近的研究表明，基础的SP，特别是聚羧酸醚/酯（PCE）影响水泥基糊剂的剪切增厚行为。在更高剂量下添加PCE，通过水泥浆料的絮凝降低表观粘度。然而，在增加的剪切力下，重新聚集导致剪切增稠的早期发作，并且还增加了其强度，从而影响泵送过程。另一方面，市售的位点特异性PCE和规定的SP剂量使问题复杂化。上述问题需要了解PCE对经历高剪切能源过程的水泥浆料剪切增厚背后的机制。在这方面，通过流变研究而不是经验测试，基于剪切速率（对应于应用）来优化SP剂量是合理的。

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