Grading method of cement-base self-leveling mortar

A self-leveling mortar and cement-based technology, which is applied in the field of cement-based self-leveling mortar, can solve problems such as undefined, fast-setting early-strength fluidity retention, high fluidity of wet mortar, and stable non-segregation properties. The effect of increased wet and dry density, high rigor and accuracy

Active Publication Date: 2015-10-21
MEICHAO GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, as one of the most complicated mortar products, cement-based self-leveling has a series of technical problems in formula design, mainly because of the balance of three major contradictions: first, the high fluidity and s

Method used

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  • Grading method of cement-base self-leveling mortar
  • Grading method of cement-base self-leveling mortar
  • Grading method of cement-base self-leveling mortar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The first step: sieve and analyze several types of sand required for production. The particle size of the sand is generally controlled between 0.08 and 1mm. Therefore, 8 sieves with different particle sizes are selected in this range, 0.90mm, 0.60mm, 0.45mm, 0.315mm, 0.22mm, 0.154mm, 0.11mm and 0.074mm. The sieves are placed in the order of small to large apertures and bottom to top, and the bottom of the sieve is attached. Pour a sand sample (100-200g) into the uppermost sieve, add a sieve cover, and sieve in sequence.

[0091] Step 2: Use a vibrating sieve machine to sieve for 10 minutes, remove them, and sieve them one by one by hand, or directly by hand, until the throughput per minute does not exceed 0.1% of the total sample.

[0092] Step 3: Weigh the sieve residue of each sieve, the sum of the sieve residue of all sieves and the residue in the bottom of the sieve, compared with the total amount of the sample before sieving, the difference shall not exceed 1%.

[...

Embodiment 2

[0120] Carry out sand gradation according to the step of embodiment 1, difference is: B=50, then as shown in table 9, table 10, table 9 is the data table of three kinds of sand before fitting and after fitting, and table 10 is three kinds of sand Formula comparison data table before and after compounding and fitting;

[0121] Table 9 The proportion data table of three kinds of sand before and after fitting

[0122] Type of sand

before fitting

After fitting

coarse sand

33

14

Middle sand

33

61

fine sand

34

25

total

100

100

[0123] Table 10 The formula comparison data table of ternary sand before and after compounding and fitting

[0124]

[0125] After adjustment, the final D=0.48, B=50, as shown in the sand gradation table 10; Figure 8 It is the curve diagram of Fuller curve and 6# formula when D is 0.8, Figure 8 The middle ◆ curve represents the gradation curve of 1# sand, and the ▲ cu...

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Abstract

The invention provides a grading method of cement-base self-leveling mortar. The method comprises the following steps: screening and analyzing sand; measuring the screening residue of each sieve, and respectively calculating a sub-screening residue weight percentage, an accumulated screening reside weight percentage and a passing rate of sand in different particle sizes; performing primary grading design on the sand; based on the primary grading design solution of the sand in the above scheme, calculating a value P, and drawing a particle grading curve; primarily setting a ratio of powder to aggregate and a maximum particle size of a Fuller curve, calculating a value B and a value Psd, and drawing a Fuller curve; comparing the particle grading curve with the Fuller curve, repeating the above steps if the difference is relatively large, and obtaining a cement-base self-leveling mortar grading proportion when the particle grading curve is overlapped with the Fuller curve on three or more points. On the basis of the Fuller curve, the full-formula screening curve and the fuller curve are fitted to obtain a densest grading scheme.

Description

technical field [0001] The invention relates to the technical field of cement-based self-leveling mortar, in particular to a method for grading cement-based self-leveling mortar. Background technique [0002] Cement-based self-leveling mortar is a single-component mortar compounded by inorganic cementitious materials, fine aggregate, filler, latex powder and various additives. During construction, just add water and stir evenly according to the specified water-cement ratio, pour it manually or by pumping on the ground of the cement mortar leveling layer, spread it evenly with a trowel and a barbed defoaming roller, rely on the self-weight and fluidity of the slurry Self-leveling, after curing, it forms an overall seamless, smooth, waterproof, anti-corrosion, air-permeable, high-strength, wear-resistant, economical and durable floor. From the difference of self-leveling bearing requirements, it can be divided into cushion self-leveling and surface self-leveling. Surface self...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/06
Inventor 朱海霞李永鑫魏磊
Owner MEICHAO GROUP
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