With natural gravel sand: stone for 3:7, belong to stone subgrade or earthwork subgrade?

With natural gravel sand: stone for 3:7, belong to stone subgrade or earthwork subgrade?

According to the term definition of highway subgrade construction specification: rock fill embankment
More than 70.5 mm in total particle size
Earth rockembankment
The stone content accounts for 30% ～ 70% of the total mass
From the definition of terms, not only to see the particle size, but also to see the content

When using sand filling method to measure the density of soil, the sand should be placed for enough time to balance with the air humidity before use

No, it is generally consistent with the state of standard sand

What is the maximum dry density in highway experiment

Maximum dry density
English Name: maximum dry density
Definition: dry density corresponding to the peak point on the relation curve between dry density and water content obtained from compaction or compaction test
When the number of blows is fixed, when the moisture content is low, the dry density increases with the increase of moisture content; when the moisture content reaches a certain value, the dry density reaches the maximum value, and the increase of moisture content leads to the decrease of dry density. The maximum value of dry density is called the maximum dry density, and the corresponding moisture content is called the optimal moisture content

When a 1 meter long cylinder is cut into two sections, the surface area is increased by 4 square decimeters. The original volume of the cylinder is () cubic decimeters

The only process is to write the sentence: "if the surface area is increased by 4 square decimeters, the area of the bottom of the cylinder is 2 square decimeters, so the volume is 200 cubic decimeters". Then write a formula 2 * 100!

The length of a cylinder is 4 meters. After it is cut into two sections, the surface area increases by 6.28 square decimeters. The volume of this cylinder is () cubic decimeters?

After being cut into two sections, two bottom surfaces of the cylinder are added, and the area of each bottom surface is 6.28/2 = 3.14 (square decimeter)
The original cylinder volume is 3.14 × 40 = 125.6 (cubic decimeter)
(this question seems to set a trap on purpose to lure you to use 6.28 to remove 3.14, which is not necessary at all.)

A cylindrical wood 10 meters long, cut into two cylindrical small wood, the surface area increased by 0.4 square meters?

2 × 10 = 2 (cubic meter). A: the original volume of this wood is 2 cubic meters

A cylindrical wood is 8cm long and cut into two sections, the surface area increases by 0.2 square meters?
I want the formula,

Added 2 bottom areas
What's the bottom area
0.2 △ 2 = 0.1 square meter
8 cm = 0.08 M
It turns out that the volume of this wood is
0.1 × 0.08 = 0.008m3

After a 6-meter-long cylindrical wood is cut into two sections, the surface area increases by 2.4 square meters. What is the original volume of the wood?
The complete formula

The increased surface area is the original bottom area × 2
So the original volume = bottom area × length = 2.4 △ 2 × 6 = 7,2 M & # 179;

A cylindrical timber is 6 meters long. After it is cut into 4 sections, the surface area increases by 24 square meters, and the volume of each section is () cubic meters
In five minutes, please

Area of cross section: 24 (3 × 2) = 4 square meters
Volume: 6 × 4 = 24 M3

A cuboid has a surface area of 72.64 square decimeters, a bottom area of 18.5 square decimeters, and a bottom perimeter of 19.8 decimeters. Find the volume of the cuboid

Cuboid side area: 72.64-18.5 × 2, = 72.64-37, = 35.64 (square decimeter); cuboid height: 35.64 △ 19.8 = 1.8 (decimeter), v = sh, = 18.5 × 1.8, = 33.3 (cubic decimeter); answer: cuboid volume is 33.3 cubic decimeter