Influence of the partial replacement of cement by ultrafine rice husk ash with high-carbon content on the properties of concrete

This paper describes the use of ultrafine rice husk ash with high-carbon content in ordinary and high-strength concretes. The influence of ultrafine ash (10, 15 and 20% of cement replacement, in mass) on rheology (yield stress and plastic viscosity), compressive strength (7, 28, 90, and 180 days) and rapid chloride-ion penetrability was investigated. In addition, two experiments were carried out on an adiabatic calorimeter to investigate the exothermic behavior of a reference concrete and conventional concrete with 15% ultrafine ash. The results indicated that the addition of ultrafine rice husk ash improved the evaluated properties for both types of concrete.

本研究探讨了高碳含量超细稻壳灰在普通混凝土与高强混凝土中的应用。针对以质量计替代率分别为10%、15%和20%水泥用量的超细稻壳灰，研究其对流变性（屈服应力与塑性粘度）、抗压强度（养护7、28、90及180天）以及快速氯离子渗透性能的影响。此外，本研究采用绝热热量计开展两组试验，分别探究基准混凝土与掺加15%超细稻壳灰的普通混凝土的放热行为。试验结果表明，掺入超细稻壳灰可改善两类混凝土的各项测试性能。