粉煤灰对沙漠砂混凝土抗压强度及抗冻性能影响试验研究

Experimental Study on the Effect of Fly Ash on Compressive Strength and Frost Resistance of Desert Sand Concrete

通过沙漠砂混凝土养护期7、28 d的抗压强度及抗冻性能试验,观察粉煤灰掺量对抗压强度和抗冻性能的影响规律。试验结果表明:抗压强度随着粉煤灰掺量增多而呈先上升后下降的趋势;当粉煤灰掺量为10%时,沙漠砂混凝土养护期7、28 d的抗压强度均达到最大值;随着冻融循环次数增加,沙漠砂混凝土质量损失率和动弹模量损失率均呈递增趋势;沙漠砂混凝土各次冻融后动弹模量随着粉煤灰掺量增多而呈先上升后下降的趋势,当粉煤灰掺量为10%时,冻融后各次动弹模量达最大值。

The fly ash concrete 7 d,28 d compressive strength and frost resistance performance test is carried out about the desert sand in different dosage to analyze the influence law of different dosage of fly ash on compressive strength and frost resistance. The test results show that the compressive strength of desert sand concrete for 7 d and28 d increases with the increase of fly ash content,and then decreases at different rates. When the fly ash content is10%,the compressive strength of desert sand concrete reaches the maximum value of 7 d and 28 d. With the increase of freeze-thaw cycles,the quality loss rate and dynamic modulus of desert sand concrete are both increasing. The dynamic modulus of desert sand concrete after each freeze-thaw increases with the increase of fly ash content. When the fly ash content increases by 10%,the dynamic modulus of each time after freeze-thaw reaches the maximum value.