能量桩混凝土配合比试验研究

Study on experiments of mixing proportion of energy pile concrete

能量桩起着桩基和地源热泵的双重作用,如何在不影响其承载力的前提下提高混凝土的导热性能,基于室内试验对能量桩混凝土中材料的配合比进行了研究.结果表明,在普通混凝土中掺入一定比例的钢纤维及置换部分铁矿砂后,对抗压强度提高不是太明显,但抗折强度呈现逐渐增长趋势,混凝土的导热系数呈现成倍增长,能够明显提高能量桩的热交换效率,当钢纤维掺入量超过2%时,抗折强度增长趋于平缓.

Energy piles serve a dual role in both pile foundation and ground source heat pump.In order to study the concrete thermal conductivity by the means of having no influence on the bearing capacity,the paper made explorations based on the laboratory experiments about the mixing proportion of the energy pile concrete.Steel fiber was mixed into the ordinary concrete at a certain ratio and some iron ore is replaced for the fine aggregate at a certain ratio.This paper studied that the compressive strength of the energy piles had no significant improvement,but the flexural performance showed a gradual increasing tendency,and the thermal conductivity of the concrete grew exponentially,which can significantly enhanced the sensible heat exchange efficiency of the energy piles.The flexural strength increases softly when the ratio of steel fiber reached to 2%.