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为明确骨架-密实、骨架-空隙和悬浮-密实型级配三灰碎石的干缩特性,采用实际工程常用的三种结构类型的三灰碎石,进行为期21 d全封闭养生和模拟施工养生的干缩对比试验.结果表明,密实悬浮级配的收缩应变最大,骨架空隙级配收缩应变最小;细集料与黏结料的用量之和决定了干缩应变的增长率;粗集料的用量影响三灰碎石干缩应变的绝对量;三灰碎石的合理封闭养生为10 d;三灰碎石的干缩系数与三灰含量呈线性递减,三灰含量为10%~15%时,抗裂性能最优.试验结果表明,采用骨架-密实级配并控制三灰用量的三灰碎石具有较好的抗干缩性能.
In order to clarify the shrinkage characteristics of skeleton-compacted, skeleton-interstitial and suspended-compacted graded lime-flyash, three types of three gray gravel commonly used in practical engineering were used for 21-day fully enclosed regimen and simulated construction The results showed that the shrinkage strain of the dense suspension grading was the largest and the contraction shrinkage of the void fraction of the framework was the smallest. The sum of the dosage of the fine aggregate and the binder material determined the growth rate of the dry shrinkage strain. The amount of dry ash shrinkage of limestone absolute value; limestone closed reasonable health 10d; limestone dry shrinkage coefficient and the three ash content decreased linearly, the three ash content of 10% to 15% , The crack resistance is the best.Experimental results show that the lime-fly ash gravel with the skeleton-dense gradation and control of the amount of soot has good anti-shrinkage properties.