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The Experimented Study and Analysis of Factors Influencing the Testing Results of Cement Strength

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Tutor: HeTingShu
School: Xi'an University of Architecture and Technology
Course: Building Materials
Keywords: cement strength,test,factors,precision,influencing factor
CLC: TQ172.16
Type: Master's thesis
Year:  2011
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Abstract:
Cement is an important widely applied building material. Its quality is directly related to the performances of concrete and the relative products, and the safety of structure. Among the all testing items of cement, the strengths are the most important one, whose precision is directly related to the proper use of cement in construction and the quality of construction project. So we must strictly execute relative standard to improve the testing precision of cement strength, reflecting the true strength of cement tested to give the good services for construction projects.There are many factors influencing the testing precision of cement strengths. Some are very obvious. If these obvious factors could not be paid attention, and the relative standards could not be strictly executed, the testing results would not reflect the true strength of cement. Therefore, the influences of the four factors such as the ratio of cement mortar, operating parameters, curing conditions, test mould and fixture status, on cement strengths were systematically investigatedAmong the proportion of cement mortar, the ratio of cement mortar, the cement-sand and the water-cement ratio are all obvious testing factors effecting cement strengths.Among the operating parameters, the factors obviously affecting cement strengths are the smooth operation, ready to face as a force, a release form and the way putting on to concrete,the factors slightly affecting cement strengths are the pilot machine to a balanced perspective, the location and the pressure test machine speed. Among the curing conditions, the factors obviously affecting cement strengths are the water temperature and the covering level of curing water for specimens, the factors slightly affecting cement strengths are the room temperature(the temperature in the 13℃~23℃), maintenance cases temperature and humidity ( the temperature in 15℃~25℃;humidity in 80%~90% ) and the placement of specimens.Trying to mould and of course means and evenness the seam is not bad, there is a butter and the lack of flexibility to the intensity will produce a significant influence, and the surface with a lot butter, the means to butter on the test results of strength are less affected.In the testing process, we must strictly control the factors obviously affecting the testing results of cement strengths, so assuring obtaining the true strengths of cement.
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