秸秆泡沫混凝土力学性能试验研究

Experimental study on mechanical properties of straw foam concrete

近年来我国对建筑节能和环保的要求越来越高,秸秆泡沫混凝土是一种具有良好保温、隔热性能的建筑材料。然而,目前对其在力学性能方面的研究还不完善,影响其在受力构件中的使用,因此,对力学性能进行试验研究。研究结果表明,泡沫和秸秆的质量分数对秸秆泡沫混凝土的流动性均有影响,其中,泡沫质量分数对流动性的影响尤为明显,当泡沫质量分数从10%增加到30%时,坍落度由122 mm上升至212 mm;泡沫和秸秆质量分数越高,秸秆泡沫混凝土的力学性能越低。当泡沫质量分数大于20%时,力学性能下降突出,抗压性能下降率达到了60%,抗折性能下降率达到了46%,因此,此类型的泡沫混凝土泡沫质量分数不宜大于20%。在制备秸秆泡沫混凝土时,需要考虑泡沫和秸秆质量分数的平衡,以满足对材料性能和应用的要求。

In recent years,China has higher and higher requirements for building energy saving and building environmental protection.Straw foam concrete is a kind of building material with good thermal insulation and thermal insulation properties.However,at present,the research on its mechanical properties is not perfect,which affects its use in the stressed members,so the experimental research on its mechanical properties is carried out in this paper.The results show that both the foam mass fraction and the straw mass fraction have an effect on the fluidity of straw foamed concrete,and the foam mass fraction has an obvious effect on the fluidity.When the foam mass fraction increases from 10%to 30%,the slump increases from 122 mm to 212 mm.The higher the mass fraction of foam and straw,the lower the mechanical properties of straw foamed concrete.Especially when the foam mass fraction is greater than 20%,the mechanical properties decline is particularly prominent,the compressive performance decline rate reaches 60%,and the flexural performance decline rate also reaches 46%.Therefore,the foam mass fraction of this type of foam concrete should not be greater than 20%.Therefore,when preparing straw foam concrete,it is necessary to consider the balance of foam mass fraction and straw mass fraction to meet the requirements of material properties and applications.