粉煤灰对砂浆强度影响的实验研究

探讨了高烧失量粉煤灰对砂浆强度的影响。用不同掺量的粉煤灰做了两组实验，测试结果表明：粉煤灰砂浆的用水量随着粉煤灰掺量的增加而增加；在蒸养后，粉煤灰砂浆试块的抗压和抗折强度比无粉煤灰试块有较大的提高；当粉煤灰掺量占水泥量的３０％时，其抗压和抗折强度最高；在标差２８ｄ后，粉煤灰掺量大于３０％的砂浆试块抗压和抗折强度比无粉煤灰试块有所降低。

THE EFFECT OF FLY-ASH ON THE STRENGTH OF MORTAR

The effect of fly-ash with high percent of loss on ignition(12. 8%) on the strength of mortar was investigated. Two series mortar specimens with different content of fly-ash from weight of cement were tested. The water requirement of fly-ash mortars increases as fly-ash content increases. The mixes containing fly-ash show a greater increase in compressive strength and flexural strength after heat-humidity processing, than the OPC mixes. The mix containing 30% fly-ash from weight of cement shows maximum compressive strength and flexural strength. The mixes containing more than 30% fly-ash, keeping 28 days in the normal condition, show decrease of compressie strength and flexural strength,compared with OPC mortar.