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首页> 外文会议>第二届自密实混凝土设计、性能及应用技术国际研讨会(2nd International Symposium on Design,Performance and Use of Self-Consolidating Concrete SCC'2009-China) >FLOW AND STRENGTH CHARACTERISTICS OF SCC CONTAINING LIMESTONE AND CHALK POWDERS
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FLOW AND STRENGTH CHARACTERISTICS OF SCC CONTAINING LIMESTONE AND CHALK POWDERS

机译：含石灰石和粉笔粉的SCC的流动和强度特性

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摘要

An investigation of the use of different types of limestone powders and chalk powder as fillers in Self-Compacting Concrete (SCC) and their effects on the flow and strength characteristics of the concrete mixes iS presented．With minor adjustments in the dosage of the superplasticiser,it was possible to develop concrete mixes with suitable self-compactability by using the limestone powders．The morphology of the powders had a significant influence on flow behavior and the best deformabilities were obtained in the SCC mixes containing the fine limestone powder whereas the coargcr chalk powder gave a relatively poor performance．Besides particle size，the shape of the powdcr particles also had a significant influence on deformabilitv．The deformability of the SCC mix with the relatively coarser but spherically shaped fly ash particles was comparable to that of the SCC mixes with the much finer but irregularly shaped limestone powder particles．The slump flow retentivity of the SCC mixes with the superplasticiser was monitored over a period of two hours after casting and was found to be satisfactory except jn the mixes with the coarser chalk powder．However,the plastic viscosity of the mixes with the higher powder addition Ievels Was found to significantly increase with time．The compressive strength of the SCC mixes containing the fine limestone powder was significantly greater at all ages than the controI SCC mix with the same powder content,particularly at early ages.
机译：研究了在自密实混凝土（SCC）中使用不同类型的石灰石粉和白垩粉作为填料及其对混凝土混合物的流动性和强度特性的影响。在对减水剂的用量进行较小调整的情况下，通过使用石灰石粉，可以开发出具有合适的自密实性的混凝土混合料。粉末的形态对流动性有很大的影响，并且在含有细石灰石粉的SCC混合料中获得了最佳的可变形性，而粉状的粉笔粉除颗粒尺寸外，powdcr颗粒的形状对可变形性也有显着影响。具有相对粗大但球形的粉煤灰颗粒的SCC混合料的可变形性与具有scc混合物的SCC混合料的可变形性相当。 SCC的坍落流保持力与t混合在一起。在浇铸后的两个小时内对高效减水剂进行了监测，发现除与较粗的粉笔粉混合使用外，效果令人满意。但是，随着粉体添加量的增加，混合物的塑性粘度随时间的增加而显着增加。含有细石灰石粉的SCC混合物的抗压强度在所有年龄段都明显高于具有相同粉末含量的SCC混合物，特别是在早期。

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