水泥性能试验（Cement property test）.docVIP

水泥性能试验（Cement property test） (1) cement test; The cement quality is tested and the physical and mechanical indexes of cement are determined by cement test. The raw data is provided for mixture ratio design. At the same time assess the quality of cement, unqualified cement can not be used. 1 、 Cement Fineness Test The fineness of cement affects the setting time, strength and hydration heat of cement directly. Therefore, it is of great significance to determine whether the fineness of cement meets the requirements of the specification. The detection methods of cement fineness are: negative pressure sieve method, water sieve method, dry sieve method. The fineness of the cement is expressed by the percentage of the quality of the sieve residue on the 0.08mm square hole sieve, and the measured value is taken as the experimental result. In case of dispute, the negative pressure sieve method shall prevail. (1) main instruments: 1. Negative pressure sieve analyzer; balance: maximum weighing 500g, sense quantity 0.01g. (2) experimental procedures and experimental results Before screening experiments, the negative pressure sieve is placed on the screen seat, covered with a sieve cover, connected with the power supply, checked the control system, and adjusted the negative pressure to the range of 4000~6000Pa. The said test raises 25g, placed on a clean vacuum sieve, sieve cover cover, put in the sieve seat, moving sieving apparatus continuous sieve sieve 2min process such as a sample attached to the screen cover, gently knock down agent sieve samples. After screening, weigh the sieve residue (accurate to 0.01g) and calculate the percentage of sieve residue. The result is accurate to 0.1%. 2. Water consumption test of cement standard consistency The amount of water used in cement standard consistency is expressed as a percentage of the amount of cement used when the cement paste reaches the specified degree of dilution. The dilute consistency of cement slurry has great influenc