影响水泥抗压强度的成型条件研究

Study of Condition of Molding on Compressive Strength of Cement

水泥抗压强度的测定过程有成型、养护、破型三个主要环节。各环节的试验条件不同,将直接影响抗压强度的测定结果。研究了水泥试件成型过程中流动度、试件尺寸、表面状态等试验条件对试件抗压强度测定结果的影响。结果表明:在一定范围内水灰比与抗压强度呈正相关关系,即水灰比越大,其流动度越好,抗压强度越高,当超过这个范围后,随着水灰比的增大,抗压强度逐渐减小;随着试件尺寸逐渐变大,抗压强度依次降低;试模涂油量多少不同,导致试件表面状态存在差异,涂油量过多或过少都会使抗压强度的测定结果偏低。

Three main aspects of molding,conservation and breaking-type were involved in the testing about compressive strength of cement sample. Different experimental conditions directly influenced the results of compressive strength test. Effects of experimental conditions such as,fluidity,dimension and surface on cement sample compressive-strength in molding process were investigated. The results showed that water cement ratio had a significant linear correlation with compressive strength within a certain range. The bigger the water cement ratio,the better the fluidity and the higher compressive strength. Beyond the range of water cement ratio,compressive strength gradually decreased with the increase of water cement ratio,and remarkably decreased with increasing the sample block size. In addition,the fluctuation of compressive strength can also be caused by the difference of specimen surface with oil coated to varying degrees,which more or less oil would reduce cement compressive strength.