A complete collection of slogans for rural self-built houses

In rural areas, the cement used varies with the height of the building. If your home is a three-story or five-story building, you can use ordinary portland cement with PE strength grade of 32.5 to 42.5, but it is best not to use R early strength cement, because this kind of cement is easy to crack and can be used as high-grade cement for large-scale projects. 42.5 cement, its price will be higher than 32.5, and the strength of cement will be higher. Do not mix different types or brands of cement during construction. It is best to use only one brand of cement to build a house, and don't mix different types of cement with the same brand; When the temperature is below 0, do not use ordinary cement. For long-term high temperature occasions, ordinary mortar or concrete can be isolated and protected by refractory bricks. When the temperature is high, special heat-resistant concrete should be used for pouring, or a certain amount of ground heat-resistant materials should be mixed into cement. Concrete or plaster layer is gradually corroded and disintegrated, and cement should not be corroded by acid. Ordinary cement is not allowed to be used in projects with strict requirements on acid and corrosion resistance.

Six details should be paid attention to when using cement in rural self-built houses:

First, self-built cement should be moisture-proof, which will reduce or even lose its original strength.

Second, self-built cement should not contact quick-drying concrete or gypsum. If exposed after surgery, its strength will decrease or even be completely lost with the rapid evaporation of water.

Third, self-built cement should avoid cold mixing concrete or mortar at negative temperature. If it is cold, the cement can't hydrate, and when it freezes and expands when it meets water, the concrete or mortar will be gradually deepened and destroyed by the powder cake from the outside to the inside. Therefore, the construction should be carried out in strict accordance with the Code for Winter Construction of Building Engineering.

Four, since the building cement should avoid high temperature curing mortar layer or concrete components.

Fifth, self-built cement should avoid water, ash and thickness. People often ignore the influence of water consumption on concrete strength. In order to facilitate concrete pouring in construction, sometimes the mixture ratio is not carefully implemented, and the concrete is mixed very thinly.

Sixth, self-built cement can avoid acid corrosion. Acidic substances in cement and calcium hydroxide will have a neutralization reaction, and the product will be loose and expand, and it will be easily hydrolyzed and pulverized when it meets water.