CAJ | 학술논문

运用同时掺加机制砂和高性能减水剂的“双掺法”制备了不同强度等级的沙漠砂混凝土，分析了高性能减水剂对沙漠砂混凝土性能的影响及不同强度等级下采用双掺法配制的沙漠砂混凝土与普通中砂混凝土坍落度及强度等性能上的区别。结果表明，高性能减水剂不仅能改善沙漠砂混凝土的和易性，且具有早强效果，并对最终强度的提高有一定帮助。双掺法制备的沙漠砂混凝土与同配合比的普通中砂混凝土相比，坍落度相差不大，在强度方面当所配混凝土强度等级较低时，二者的抗压强度相近；随着混凝土强度等级的提高，沙漠砂混凝土的抗压强度逐渐低于普通中砂混凝土。此外，与按照常规方法制备的沙漠砂混凝土相比，双掺法制备的沙漠砂混凝土的坍落度有很大提高。
운용동시참가궤제사화고성능감수제적“쌍참법”제비료불동강도등급적사막사혼응토，분석료고성능감수제대사막사혼응토성능적영향급불동강도등급하채용쌍참법배제적사막사혼응토여보통중사혼응토담락도급강도등성능상적구별。결과표명，고성능감수제불부능개선사막사혼응토적화역성，차구유조강효과，병대최종강도적제고유일정방조。쌍참법제비적사막사혼응토여동배합비적보통중사혼응토상비，담락도상차불대，재강도방면당소배혼응토강도등급교저시，이자적항압강도상근；수착혼응토강도등급적제고，사막사혼응토적항압강도축점저우보통중사혼응토。차외，여안조상규방법제비적사막사혼응토상비，쌍참법제비적사막사혼응토적담락도유흔대제고。
The test has made different strength grade concrete by using the double-admixing method, which is“mixed with high performance water-reducer, mixed with artificial sand“. The effect of high performance water-reducer on the desert sand concrete is analyzed. The differences in slump and strength of the desert sand concrete made by using the double mixed method and the ordinary concrete at different strength grade are researched. The results show that the high performance water-reducer not only improves the workability of desert sand concrete, but also has the effect of early strength, and even does some good to the improvement of ultimate strength. Compared with the desert sand concrete made by using the double-admixing method and the ordinary medium sand concrete, the slump is closed, and compressive strength of the desert sand concrete and ordinary medium sand concrete is very close when the strength grade of concrete isn’t high. As the concrete strength increasing, the compressive strength of the desert sand concrete is lower than that of the ordinary medium sand concrete gradually. Compared with the desert sand concrete made with desert sand made by conventional method, the slump of the desert sand concrete made by using the double-admixing method is obviously im-proved.