Grading method of cement-base self-leveling mortar

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...

AI Technical Summary

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 stability of wet mortar; Second, fast setting early strength and fluidity retention during construction; third, high content of fine powder and shrinkage of post-hardening mortar

But how these four ratios are derived is not clearly stated

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