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Direct electric curing of alkali-activated fly ash concretes : a tool for wider utilization of fly ashes

机译：碱激发粉煤灰混凝土的直接电固化：一种广泛利用飞灰的工具

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摘要

Utilization of the fly ashes is a major problem in many developing countries and in South Africa onlyabout 7% of the fly ash produced annually by coal-fired power stations, is being utilized. Although, flyashes can be used as an alternative binder in alkali-activated concretes, strength development of theseconcretes at room temperature is slow limiting application of the material. Direct electric curing isproposed for heat curing of alkali-activated fly ash concrete which will open new opportunities for insituapplications of these concretes in the construction industry thus increasing the amount of benefi-cially utilized fly ash. Alkali-activated fly ash concretes containing unclassified low calcium fly ash, sodiumhydroxide and sodium silicate solutions were cured at 60 C by means of direct electric curing. Theelectric resistivity and compressive strength development of the concretes were investigated. The resistivitystrongly depends on the type of activator used. Compressive strength up to 33.8 MPa and48.5 MPa at 2 and 28 days respectively, can be achieved after a short period of direct electric curing. Thisopens new opportunities for wider application of alkali-activated fly ash concretes and for moreextensive utilization of fly ash.
机译：粉煤灰的利用是许多发展中国家的主要问题，在南非，每年仅利用燃煤电站产生的粉煤灰的约7％。尽管粉煤灰可以用作碱活化混凝土中的替代粘合剂，但是这些混凝土在室温下的强度发展缓慢限制了该材料的应用。提出直接电固化用于碱活化的粉煤灰混凝土的热固化，这将为这些混凝土在建筑业中的现场应用提供新的机会，从而增加了有益地使用的粉煤灰的量。含有未分类的低钙粉煤灰，氢氧化钠和硅酸钠溶液的碱活化粉煤灰混凝土通过直接电固化在60°C下固化。研究了混凝土的电阻率和抗压强度的发展。电阻率强烈取决于所用活化剂的类型。短时间的直接电固化后，可以在2天和28天时分别达到33.8 MPa和48.5 MPa的抗压强度。这为碱活化粉煤灰混凝土的广泛应用和粉煤灰的更广泛利用开辟了新的机遇。

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