Study on mechanical and dissipative energy characteristics of self-compacting desert sand lean concrete desert after saturated freezing
In order to study the mechanical properties of self-compacting desert sand lean concrete after freezing in water,low-temperature freezing tests after freezing in water were carried out,and the results were compared with those in dry and saturated conditions.The results showed that(1)Uniaxial compressive strength increased from 2.6 times to 5.2 times compared with dry condition and from 3.8 times to 8.9 times compared with that in saturated conditions.The elastic modulus increased from 1.2 times to 1.8 times compared with dry condition and from 1.7 times to 1.9 times compared with saturated condition,and the strength increased by more than elastic modulus.Ductility coefficient and energy dissipation coefficient are increased slightly.(2)With the increase of cement content,the strength increases gradually,but the peak strain decreases gradually,indicating that the brittleness increases and the ductility decreases while the strength increases.Compared with the dry and saturated test blocks with the same ratio,the peak strain of the saturated frozen test block is larger,indicating that its ductility is improved at low temperature.(3)The internal mechanism of strength and stiffness improvement after hydration freezing is that ice contributes part of strength and stiffness,which may be because water in micro-pores freezes and becomes a part of the test block,which is equivalent to improving the compactness of concrete,and the cohesion and bite force between aggregate particles are improved after water freezing.
self-compacting desert sand lean concretemechanical propertiespeak strainsaturated freezingdissipative energy characteristics
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