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Advances in Materials Science and Engineering
Volume 2017, Article ID 7234761, 7 pages
https://doi.org/10.1155/2017/7234761
Research Article

Use of Preplaced Casting Method in Lightweight Aggregate Concrete

1School of Civil Engineering, Chang’an University, Xi’an, Shaanxi 710061, China
2School of Civil Engineering, Birmingham University, Birmingham B15 2TT, UK

Correspondence should be addressed to Qiang Du; nc.ude.dhc@ud.q

Received 21 December 2016; Accepted 15 March 2017; Published 27 March 2017

Academic Editor: Andres Sotelo

Copyright © 2017 Qiang Du et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study addresses the use of preplaced casting method in lightweight aggregate concrete (LC) to provide a new perspective to solve the aggregate segregation. In casting preplaced lightweight aggregate concrete (PLC), the lightweight aggregates are cast into formworks and then fresh grout is injected to fill voids. PLC and conventional lightweight aggregate concrete (CLC) with three different mixtures are compared to observe the degree of segregation. The properties of PLC and CLC are characterized by means of cubic and axial compression, splitting tension and flexural tests, static modulus of elasticity, and drying shrinkage measurements. Results show that the mechanical properties of PLC are improved with respect to that of CLC with the same mixture. The increase of shrinkage is approximately 13% for the CLC and 6% for PLC when w/c ratio ranges from 0.4 to 0.5 due to effect on interlocking. PLC shows an increased tendency in elastic modulus by approximately 2.5% of 0.5 w/c ratio, 2.7% of 0.45 w/c ratio, and 3.3% of 0.4 w/c ratio at the age of 28 days compared with CLC. In conclusion, PLC has significant reduction in the weight on the premise that it shows excellent mechanical properties.