Research on Influence of Stone Powder Content and Water-binder Ratio on Optimal Gradation of Manufactured Sand

The poor gradation of manufactured sand limits the application in concrete work. Hence, in order to study the influence of the gradation of manufactured sand on the performance of mortar, this paper removes the stone powder from the manufactured sand, increases the content of different sands based on the mid-value of gradation, mixes it with different proportions of stone powder and tests the expansion degree of mortar with the water-binder ratio of 0.35, 0.4 and 0.45 respectively. The test results show that the influence of the gradation of manufactured sand on the expansion degree of mortar depends on the stone powder content and water-binder ratio. When the stone powder content is less than 5%, the expansion degree of motor will be reduced with the gradation adjustment; if the stone powder content is more than 5%, the expansion degree of mortar will show different characteristics with the gradation adjustment under different water-binder conditions.