高强次轻混凝土的配制

Preparation of fiber reinforced specified density concrete

为了降低混凝土结构的重量,应用体积取代法配制了新型高强纤维增强次轻混凝土。试验结果表明,随着陶粒掺量的增大,混凝土的重量不断降低,28 d抗压和劈裂强度有所增大,但掺量超过50%时,强度出现降低;由于陶粒预先吸水,发挥了内养护(或自养护)的优势,混凝土后期强度增长显著,掺40%～50%左右的陶粒基本可以满足C40混凝土强度的要求;纤维的掺入,使混凝土劈裂强度增大明显,可以满足结构对混凝土材料变形的要求。当纤维掺量为1.2 kg/m^3时为最适合纤维掺量,且当陶粒掺量为50%时,自重下降较大,强度、变形等基本能满足混凝土结构要求。

In order to reduce the weight of concrete structure, using the volume substitution method, a new fiber reinforced specified density concrete is made.The test results show that with the increase of eeramsite, the weight of the concrete decreases, and 28 days＇ compressive strength and splitting strength increases. But when the content of eeramsite is more than 50%, the strength decreases. The late strength of concrete increases significantly because the ceramsite absorb water in advance and play the advantages of maintenance （or self- maintenance） , adding about 40%-50% of the ceramsite cam basically meet the requirements of the strength of C40 concrete. The mixed fibers make the concrete compressive strength and splitting strength increase, which can satisfy the deformation of concrete structure. When the fiber content is 1.2 kg/m^3, it is the best suited content, and when the content of eeramsite is 50%, the self-weight decreases greatly.The strength and deformation ean meet the requirements of the concrete structure.