Cement products are necessary for building a house. Good cement products can create a stable house. However, in life, we will inevitably encounter some defective cement. Cement product experts will introduce to us what are the characteristics of defective cement to prevent being deceived in future purchases.
1. Defective cement products include waste cement—In portland cement products, if one of the magnesium oxide, sulfur trioxide, initial setting time, and stability does not meet the rules, it can be considered as waste cement. This type of product is obstructed during construction.
2. Defective cement products-In the production of cement products, if one of the fineness, final setting time, insoluble matter and loss on ignition does not meet the rules or the mixture is mixed with the goal of the rule, it can be regarded as unqualified cement. product. Generally qualified cement products will standardize the manufacturer's title and product number.
The defective cement has caused great damage to our construction. The cement is used to create the homes of Kuaqiang. It is the place where we live in the future, and we cannot tolerate any defects. Cement product experts remind us that we must be stable when choosing cement products, understand the characteristics of defective cement products, and trust will be of great help to you.
It is used in many areas, and it is assumed that there is not much attention during the production process and the situation of slurry leakage is briefly presented. The main reasons for the introduction of cement pipe leakage are the following:
1. In terms of equipment: the joints of the cement pipe mold are severely deformed or damaged, and the bolts are uneven or partially damaged, which constitutes a failure of fastening;
2. In terms of craftsmanship: the seam opening is not carefully picked up, accumulates in the seam opening, the seam is dislocated, and the bolt is not settled according to the rules.
Leakage of cement pipe not only affects the appearance, but also reduces the impermeability and durability of the pipe. In order to prevent the occurrence of slurry leakage, the deformed cement pipe mold should be corrected in terms of equipment. Severe choice should be made. The cement pipe mold bolt should be Completely complete; in terms of technology, the inside of the seam should be carefully picked up, and left and right aligned up and down to prevent misalignment.
When the cement pipeline is buried when it encounters the current pipeline or the storm sewer is interspersed, the pipeline penetration method is adopted, which can reduce the depth of the pipeline and is not easy to block. An inspection well is set up at the pipe penetration point to allow another pipeline to pass through the well. The key is to ensure that the water passing area in the well is greater than or equal to the cross-sectional area of the pipe being passed. The size of the water passing area in the well can be set through the pipe inspection well. Size to manipulate. The principle of pipe running is that small pipes run through large pipes, and current pipes run through planned pipes.
The speed of construction is getting faster and faster, and it is inevitable to deal with cement products during our construction process. After mixing cement and water, it will become a semi-fluid with plasticity. After passing through for a period of time, the cement slurry gradually loses plasticity and adheres to its original shape. This phenomenon is called condensation (divided into initial setting and final setting). Then it entered the hardening period, and the strength of the cement was gradually added.
There must be a certain plan for the cement condensation time during construction. Assuming too fast agglomeration, the concrete will quickly lose fluidity and then affect vibration; on the contrary, assuming too agglomeration, it will affect the construction speed. Therefore, the initial setting time and final setting time of the standard and regular cement should be within the necessary planning.
The determination of the coagulation time is carried out by using cement paste of standard consistency under certain temperature and humidity conditions. Calculated from the time of adding water, until the test pin sinks into the pulp, 0.5 to 1. Omm, the moment is broken, the required time is the initial setting time, the pulp has initially lost its plasticity; until the test pin sinks into the pulp, it does not exceed 1 Omm breaks at all times, and the required time is the final setting time. At this moment, the pure pulp completely loses its plasticity and enters the hardening period. Different cement thicknesses are different at different moments, but as long as we query and practice more, we will be able to do more with less!
1. It is necessary to check whether each department is normal before use. Recognize that each hose is connected reliably.
2. The rules in the main parameters should be strictly adhered to during operation. Overloading should be avoided. Perhaps after the trip is reached, there will still be continuous suppression. Otherwise, when the lifting height or lifting tonnage crosses the rules, severe oil leakage will occur at the top of the cylinder.