Home xin The larger the number of the label printed on the cement packaging bag, the better the quality of the cement?

The larger the number of the label printed on the cement packaging bag, the better the quality of the cement?

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(2) the cement grade is changed to strength grade

the six cement standards implement the strength grade expressed in MPa, such as 32.5, 32.5R, 42.5, 42.5R, etc., so that the value of strength grade is the same as the minimum value of 28 day compressive strength index of cement. The new standard also uniformly plans the strength grade of cement in China. Portland cement is divided into three strength grades and six types, namely 42.5, 42.5R, 52.5, 52.5r, 62.5 and 62.5r. The other five cements are also divided into three grades and six types, namely 32.5, 32.5R, 42.5, 42.5R, 52.5 and 52.5r
at present, cement has become an indispensable main material in any building construction. Take a closer look. The numbers of 400, 500 and 600 are written on the cement packaging bag. Don’t underestimate these numbers. They all represent different meanings

we need high-strength cement to build large bridges, but we don’t need high-strength cement to build ordinary houses and warehouses. According to different needs, we can make products of different grades and quality. The mark of cement is their grade mark. Its specific contents include:

1 The strength after solidification, the higher the label, the higher the strength. Including compressive and tensile capacity

2. The setting speed of 700 and 800 is fast hardening cement with short setting time. It is used for emergency engineering and underwater construction

cement strength testing is generally conducted at the age of 3 days, 7 days and 28 days, and each age has different testing standards. Cement is a kind of hydraulic cementitious material. The strength increases with time. The growth is completed in a certain time. Generally, the strength growth stops after one year

in addition to various labels, the classification of cement is distinguished by different materials and characteristics, such as slag Portland cement, pozzolanic Portland cement and ordinary portland cement. There are also characteristic cements, such as acid resistant cement, heat-resistant cement, Portland resistant cement and expansive cement, which are named according to their characteristics.

the label represents the strength of cement. Not the bigger the better. Instead, select the appropriate strength through the label. What is suitable is the best
if you mix C20 concrete and use high-grade cement, the strength will increase, but the cost will be wasted

cement grade is determined according to the value of strength grade, which is the same as the minimum value of cement 28 day compressive strength index. The higher the grade, the higher the strength, and the higher the compressive and tensile capacity. Generally, 325# cement is used for house decoration. It is not necessary to choose higher grade cement.
The larger the

data, the higher the intensity under the same conditions

there are 32.5 and 42.5 commonly used cements. 42.5 means that the strength per unit area is higher than 32.5

generally, there will be requirements on the drawing. The corresponding price of high intensity is also higher. Therefore, we should choose according to the needs of use. In this way, the cost can be reasonable

at present, in addition to the commonly used cement, there are also special cement, etc. Each has its own different uses

What are you doing? 325 for the city and 425 for the exterior wall

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