Which is more expensive than the sand aerated block of silty sintered hollow insulation bricks

1. Activity 1 (1) Talk IntroductionNext week, a delegation will visit our school, which student would like to be a little narrator and lead the guests to visit our beautiful campus? (2) Present**: School Floor Plan Teacher Questions:

1.If you're a docent, what do you want to tell people about the school? 2.

What math problems can you ask in these places? 3.You've come up with so many math problems, a lot of them are about the playground, and everybody loves to go to the playground.

What is your favorite activity? 2. Activity 2 (1) Present**: Everyone come to exercise 1

Group Learning Observation Diagram: Who is on the Diagram? What are you doing?

2.Fill in the blanks independently. 3.

Report exchange: Tell me how you filled it out? (1) There are 5 trees here.

2) Have one (10) players participate in a soccer match. (3) There are (3) rows of trees. (4) There were three people skipping rope, and another child came, a total of 4 people.

3+1=4) (2) Group discussion research: What other mathematical problems can be asked according to the content in the diagram? Question:

1.How many trees are there? (5+10=15)2.

How many pots of flowers are there? (3+4+3=10)3.How many people are there jumping rope and running?

3+10=13)4.How many more people play soccer than do drills? (10-4=6)5.

How many people climb the iron frame than do the runners? (10-3=7)6.How many more people do than jumping rope?

4-3=1)7.There were 10 people running, there were 4 girls, how many boys were there? (10-4=6)…3. Group ActivitiesDuring physical education class, take a walk around the campus in small groups, take a look, think about what math problems you can ask, and communicate with other groups.

Silty sintered hollow insulation bricks.

Non-clay sintered solid brick is the well-known standard brick, it is made by mining, modulation, brick making, drying, roasting, cooling, roasting, roasting coal blending amount is solid sintered clay brick coal blending amount of 20-60, the amount of coal blending to ensure that the product is only the surface, 240 115 53mm (85 bricks) 216 105 43mm;

Aerated concrete block is a new type of building material that is lightweight and porous, thermal insulation, good fire performance, nailable, sawable, planable and has certain seismic resistance.

Aerated concrete block length: 600mm

Height: 200mm, 240mm, 300mm

Width: 100mm, 120mm, 150mm, 180mm, 200mm, 240mm

a) Water absorption.

Water absorption performanceThe water absorption performance of red bricks is required to be less than 23, generally below 20. The water absorption rate of autoclaved lime sand brick is generally below 20, and the water absorption rate of autoclaved aerated concrete block is generally below 65, both are very different from the equilibrium moisture content, if there are no good rainproof measures in rainy weather, their actual moisture content can be close to their respective water absorption rate. The actual moisture content of red bricks has little effect on its actual dry shrinkage value, while the actual dry shrinkage value of silicate products changes greatly with the change of the actual moisture content of the products.

b) The rate at which the water content evaporates.

Autoclaved sand-lime bricks and autoclaved aerated concrete blocks absorb much more water than red bricks, and at the same time, they evaporate much slower than red bricks, which means that they will have a large actual shrinkage value for a long time after absorbing a large amount of water. The relevant test data shows that under the condition of temperature of 20 1 and relative humidity of 60 10, the red brick is dried and shrunk about 90 within 3 days, and the moisture is removed about 60, while the lime sand brick is dried and shrunk in 3 days is about 15, and the moisture is removed about 50, and the dry shrinkage is completed about 35 and the moisture is removed about 60, and the dry shrinkage is completed about 60 and the moisture is removed about 70.

iii) The speed of drying and shrinkage.

The standard shrinkage value of red brick is below the drying shrinkage value, and the actual dry shrinkage value is generally only slightly smaller than the standard dry shrinkage value, but it is very close in any state. For autoclaved sand-lime bricks and autoclaved aerated concrete blocks, their standard dry shrinkage value is generally 3 6 times that of red bricks. If you want to control their actual dry shrinkage values, their corresponding moisture content is about and respectively.

The equilibrium moisture content of autoclaved sand-lime bricks is about, and the equilibrium moisture content of autoclaved aerated concrete blocks is about, which shows that when the actual moisture content of silicate products is close to the equilibrium moisture content, the actual dry shrinkage value is not much different from that of red bricks. In practical application, as long as a certain drying period is passed, we can generally control their actual dry shrinkage value within the range, which fully shows that it is very important to strictly control the moisture content of the wall on the new wall materials.