TY - EJOU
AU - Jia, Liang
AU - Li, Chunxiang
AU - Guo, Jian
TI - Mechanical Properties of Lime-Fly Ash-Sulphate Aluminum Cement Stabilized Loess
T2 - Journal of Renewable Materials
PY - 2020
VL - 8
IS - 10
SN - 2164-6341
AB - Lime-fly ash stabilized loess has a poor early strength, which results in
a later traffic opening time when it is used as road-base materials. Consideration
of the significant early strength characteristics of sulphate aluminum cement
(SAC), it is always added into the lime-fly ash mixtures to improve the early
strength of stabilized loess. However, there is a scarcity of research on the
mechanical behavior of lime-fly ash-SAC stabilized loess and there is a lack of
quantitative evaluation of loess stabilized with binder materials. This research
explored the effects of the amount of binder materials, curing time and porosity
on the unconfined compressive strength (UCS), splitting tensile strength (STS),
cohesion (c) and friction angle (φ) of lime-fly ash-SAC stabilized loess by a series
of unconfined compressive tests (UCT) and splitting tensile tests (STT). The
results indicate that an increase in curing time and a decrease in porosity lead
to a continuous increase in the UCS and STS for lime-fly ash-SAC stabilized
loess. The addition of SAC has a prominent enhancement in the early strength
of lime-fly ash-SAC stabilized loess. When the curing time, porosity, and binder
content were constant, the UCS and STS increase with increasing SAC content;
For a stabilized loess with 30% binder content and 5% SAC content after
1 day of curing, the UCS was greater than 0.7 MPa, which meets the requirement
of opening traffic, so lime-fly ash-SAC stabilized loess could be used as an excellent maintenance material for road-base; In accordance with the analysis of testing
data, empirical relationships between the UCS and STS of lime-fly-SAC stabilized
loess and key effect factors (binder materials content, curing time and porosity)
were developed, which can provide references for reasonably selecting the
amount of binder materials, compaction degree and curing period to meet the
required strength of practical engineering. Finally, based on the Mohr-Coulomb
theory and the above empirical relationships, a simpler method for calculating
the c and φ of stabilized loess was proposed, with which, the shear strength parameters can be determined only by UCT or STT.
KW - Loess; sulphate aluminum cement; unconfined compressive strength; splitting tensile strength
DO - 10.32604/jrm.2020.012136