What is the water retention rate of cement plastering mortar? Mortar water retention formula

The water retention rate of cement mortar, the amount of cement does not determine the role, the decisive role is the admixture and dosage, such as methyl cellulose ether, mortar king, etc.

Summary. Calculation method of water retention rate of mortar:

1. Firstly, calculate the amount of water (z) in the mortar before water absorption according to formula (1):

z=[y (w-u)] 1350+450+y)(1) where: u--mass of the empty mode, g;

w—the quality of the test mold filled with mortar, g;

y—the water consumption for preparing the mortar with a fluidity value of 180mm and 190mm, g.

2. Calculate the water retention rate (R) according to formula (2).

r = z-(x-v)] 100/ z…(2) where: v - the mass of 8 filter papers before water absorption, g;

x—the mass of 8 pieces of filter paper after water absorption, g;

Z - the amount of water in the mortar before water absorption, g.

Mortar water retention formula

The calculation method of the water retention rate of the mortar: 1. First of all, calculate the amount of water in the mortar before water absorption according to formula (1): z=[y (w-u)] 1350+450+y) (1) where:

u--mass of the empty mode, g; w—the quality of the test mold filled with sand and rolling and leaking slurry, g; y—the water consumption for preparing the mortar with a fluidity value of 180mm and 190mm, g. 2. Calculate the water retention rate (r) r = z-(x-v)] 100 z.... according to the public search auspicious formula (2).(2) where: v - the mass of 8 filter papers before water absorption, g; x—the mass of 8 pieces of filter paper after water absorption, g; Z - the amount of water in the mortar before water absorption, g.

3. Calculate the average value of the water retention vertical group rate of the two tests to an integer. 2%, repeat the test, and then use a batch of freshly mixed mortar for two sets of tests.

Refers to the percentage of moisture covered by the surface or surface of cement particles in a cement mixture.

Cement water retention rate refers to the percentage of moisture covered by the surface of cement particles in a cement mixture. It is an important indicator to measure the water-holding performance of cement concrete. The high water retention rate of cement indicates that cement concrete has good fluidity, is easy to construct and form, and can ensure the strength and durability of concrete.

Cement is a powdered hydraulic inorganic cementitious material. After stirring the hidden water of Jiahuituan, it forms a slurry, which can be hardened in the air or in the antechamber in the water, and can firmly cement sand, stone and other materials together.

Which items are the requirements for the water retention rate of mortar? （）

a.Cement sand stupid Qi with slurry 80

b.Cement-mixed mortar 84

c.Ready-mixed masonry mortar 88

d.Cement-mixed mortar 85

Zheng Zai Zheng answered: ABC

Summary. Neutral plastering mortar has good water retention function, no cracks occur after hardening, excellent water vapor permeability, better crack resistance and impermeability function. Gaogu, a plastering mortar manufacturer in Xi'an, has been focusing on the production of various mortars and putty powder for many years.

The characteristics of ordinary plastering mortar are as follows: The plastering layer stove ruler does not bear the load; The plastering layer and the base layer should have sufficient bonding strength, so that it will not fall off or crack during construction or under long-term self-weight and environmental action; The plastering surface layer is mostly a thin layer, and it is applied in layers, and the surface layer is required to be flat, high, clean, meticulous and beautiful; It is mostly used for drying ring code difference environment, and a large area is exposed to air.

Neutral plastering mortar has good water retention function, no cracks occur after hardening, has excellent water vapor permeability, and better anti-cracking, impermeability and limb function. Xi'an plastering mortar manufacturer Gaogu has been focusing on the production of various mortars and putty powder for many years.