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Properties of self-compacting lightweight concrete
Self-compacting concrete (SCC) owns excellent workability and is able to keep the aggregate from separating. It is a great contribution for construction technology. However, the natural aggregate with limited resource has become an obstacle to popularize SCC in the future. Therefore, lightweight aggregates were used in this research to replace the naturals in SCC as the self-compacting lightweight concrete (SCLC). The difference in fresh and harden concrete between SCC and SCLC were discussed. The unit-weight of lightweight aggregate is less than the naturals but heavier than the mortar. It is disadvantageous to improve the compacted effect, but overcomes the defects of SCC with aggregate easily separating and sinking. The proportion of coarse aggregate in concrete is increased appropriately for conforming to the request of self-compacting concrete. The experimental results show that the SCLC can be produced successfully when the slump-flow reaches 600 mm to 700 mm and the height of U-test reaches 300 mm by controlling water absorption of lightweight aggregate and the viscosity coefficient of mortar. No matter slump-flow, U-test and V-funnel test, SCLC is better than SCC under the same aggregate volume in concrete. The properties of harden concrete can fit in with the general requests, and uniform test result matches the request of code, too. Because of the less self-weight, SCLC has slower flowing process. The time through V-funnel increases about 5 sec to 10 sec, the duration of U-test extends about 20 seconds and the height of U-test reduces about 50 mm. When the slump-flow is over 700 mm, there will be a potential crisis of aggregate separating.
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