Abstract
Self-consolidating lightweight aggregate concrete (SCLC) is a highly flowable and lightweight concrete. In this study, the properties of SCLC and prestressed SCLC members were tested and compared with those made of normal-weight self-consolidating concrete (SCC). The test results show that SCLC can be used for prestressed concrete members. The use of lightweight aggregates with a particle density larger than 1100 kg/m3 can avoid the serious segregation of fresh concrete. In addition, the SCLC designed in this study can meet most of the SCC Rank 2 test standards, except for the V-funnel test. The water contained in the lightweight aggregates supplied sustained curing, so the level of drying shrinkage of the SCLC was lower than that of the conventional SCC. However, the level of creep of the SCLC was higher than that of the conventional SCC, because normal-weight aggregates are more able to inhibit the change of the concrete’s volume. On-site test results show that after 180 days of prestressing, the prestress loss was about 5.35–6.83% for the full-size SCLC members, which was smaller than that for the conventional SCC members (about 8.19–9.06% loss).
Highlights
Lightweight aggregates (LWAs) can be roughly divided into two types: natural aggregates and artificial aggregates [1,2]
The results show that the unit weights of fresh concrete mixed with LWAs were roughly between 1950–2040 kg/m3, while the air contents were between 1.2–3.7%
The water contained in the LWAs supplies sustained curing, which can reduce the occurrence of drying shrinkage and help increase the strength.The specific creep test was performed with cylindrical seven days of age, the specific creep of the Self-consolidating lightweight aggregate concrete (SCLC)-40-1 specimen was about 183% of that of the self-consolidating concrete (SCC)
Summary
Lightweight aggregates (LWAs) can be roughly divided into two types: natural aggregates and artificial aggregates [1,2]. The development of LWAs has focused on industrial waste or municipal solid waste as a raw material for reducing the use of natural resources [3,4,5,6,7,8,9,10,11,12]. The use of LWAC can reduce a structure’s weight by more than 20%, and can effectively reduce the seismic load [13,14] It can reduce the installation and transportation costs of pre-cast members. From this point of view, LWAC is an important building material for sustainable development
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