Experts, what are the test steps for the standard consistency of cement slurry?

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Qinqin I am happy to answer for you, my answer is as follows: Qinqin, the method of configuring the standard consistency cement slurry is as follows: the standard consistency of cement is the degree of dilution of cement slurry, and it is the ratio of water consumption to cement quality when cement slurry reaches the standard consistency.

If there is too much water in the cement slurry, it will become thinner, and it will flow easily when it is too thin; If too little water is added to the slurry, it will become thicker, and it is not easy to smooth when it is too thick. Significance: 1. When testing the setting time and stability of cement preparation, the consistency of cement slurry will affect the test results.

2. The water demand of various varieties of brand cement can be known by using the standard consistency of cement sellers, and the quality of cement with large water demand is worse than that of cement with small water demand, so that there is one more index for evaluating cement quality.

The water consumption of cement standard consistency is the water consumption when the cement slurry reaches a certain consistency measured according to the standard method. The Chinese standard stipulates that either of the two methods of adjusting the amount of water or the amount of water can be determined, and the former shall prevail in case of dispute. The water adjustment method is that when the test cone of the tester (cone bottom diameter 40mm, height 50mm) sinks to a depth of 28 2mm in the slurry, the mixing water consumption is the standard consistency water consumption, which is expressed as a percentage of cement mass.

The standard consistency of cement indicates the degree of thinness of cement mortar, and is the ratio of water consumption to cement quality when reaching the standard consistency cement slurry. If too much water is added to the cement mortar, it will become thin, and the mortar is easy to flow when the mortar is too thin; If too little water is added to the mortar, it will thicken, and the mortar is not easy to smooth when the mortar is too thick. The consistency of cement mortar is determined using a consistency tester.

The consistency tester is composed of a bracket, a measuring rod, a pointer, a dial, a slide bar, a cone, a conical cylinder, a base and other parts.

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When determining the setting time of cement, the cement slurry of standard consistency should be used as follows: because the amount of water added has a great impact on the measured value of some technical qualities of cement (such as setting time, etc.), so when measuring these properties, it must be carried out under a specified consistency, and the specified consistency is called standard consistency. Cement stability is also known as "cement volume stability".

One of the important indicators of cement quality. It reflects the uniformity of the volume change of cement in the process of setting and hardening. If the cement contains excessive free lime, magnesium oxide or sulfur trioxide, uneven volume changes will occur when it is condensed and hardened, and unstable phenomena such as cracking, bending, loose wheel brittleness and collapse will occur.

The setting time of cement is determined by a cement slurry of standard consistency and a cement slurry setting time tester at a specified temperature and humidity environment. The initial setting time shall not be less than 45min, the final setting time shall not be greater than, the initial setting time of ordinary Portland cement shall not be less than 45min, and the final setting time shall not be greater than 10h (600min). Hope mine can help you <>

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When the test rod stops sinking or releases the test rod for 30s, record the distance between the test rod and the bottom plate, and immediately lift the test rod to wipe the collapsed Xinbi; The whole operation should be completed within the time of stirring. The cement slurry with the test rod sunk into the slurry and 6mm1mm away from the bottom plate is used as the standard consistency slurry.

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The determination of the co-cement setting time and stability is to test the prepared standard consistency cement slurry. Cement: powdered hydraulic inorganic cementitious material.

After adding water and stirring, it forms a slurry, which can be hardened in air or water, and can firmly cement sand, stone and other materials together. The early lime-to-pozzolanic mixture is similar to modern lime pozzolana cement, cementing crushed concrete to harden and resist erosion from fresh or salt water. For a long time, as an important cementitious material, it has been widely used in civil construction, water conservancy, national defense and other projects.

Cement is divided into (1) general cement: cement commonly used in general civil engineering and construction projects.

General cement mainly refers to the six types of cement specified in GB175-2007, namely Portland cement, ordinary Portland cement, slag Portland cement, Lunna pozzolana Portland cement, fly ash Portland cement and composite Portland cement. (2) Special cement:

Cement for special purposes. Such as: G-grade oil well cement, road Portland cement.

3) Characteristic cement: a certain cement with outstanding performance. Such as:

Fast hardening Portland cement, low-heat slag Portland cement, expanded sulphuraluminate cement, phosphoaluminate cement and phosphate cement. Hope mine can help you <>

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The room temperature and humidity of the cement, the conversion of the standard consistency is worth the amount of water consumed, and the slight adjustment depends on the cement bonding of the mixer.