High-early strength type polycarboxylate compositional water reducing agent for unballasted track plate

Abstract

The invention relates to an early strength polycarboxylate compound water reducing agent for a ballastless rail slab, which relates to the field of building materials. The water reducing agent is prepared from 1 to 5 weight percent of early strength component, 5 to 10 weight percent of viscosity reduction component, 1 to 50 weight percent of shrinkage component and 80 to 93 weight percent of mother liquor which are mixed together and dispersed in water, wherein the mother liquor is a polycarboxylic acid high performance water reducing agent; the early strength component comprises calcium nitrate, sodium nitrate and / or triisohydramine, and triisopropanolamine; the viscosity reduction component is polyethyleneglycol; and the shrinkage component C is fatty group polyethenoxy ether. The waterreducing agent is applied to manufacturing the ballastless rail slab, can obviously reduce the viscosity of concrete, and satisfy the requirement on the fluidity in the process of concrete construction, wherein the slump is between 140 and 200 millimeters, the compressive strength within 16 hours is more than 48 MPa, and the high performance concrete for the ballastless rail slab completely satisfies the technical requirement of 'Tentative Technical Condition of High Performance Concrete for Passenger Dedicated Lines'.

Description

Technical field [0001] The present invention relates to the technical field of building materials, in particular to a water reducer for ballastless track slabs. Background technique [0002] Ballastless track is a form of track structure composed of concrete or asphalt mixture instead of bulk ballast bed. It has the characteristics of high track smoothness, good rigidity uniformity, long-lasting track geometry and significantly reduced maintenance workload. , The train running on it is faster and more stable, which is the development direction of high-speed railway engineering technology, and it is also the advanced track technology in the world today. [0003] Concrete mixture is generally obtained by mixing cement, sand, gravel and water in proportion. In order to improve the performance of concrete, some admixtures are also added to the concrete mixture. Water reducer is one of them. By adding water reducer, the concrete has the advantages of high water reducing rate, good slum...

AI Technical Summary

Problems solved by technology

At present, the commonly used water reducer is polycarboxylate water reducer, but there are some obvious defects when the mother liquor of polycarboxylate water reducer is used alone to prepare concrete for ballastless track slab (Borg slab): When the dosage is too large, the concrete will bleed and grout. When the dosage is too low, the viscosity of the concrete will increase, it will be difficult to pour and vibrate, the air bubbles will not overflow easily, and the quality of the board surface will be poor, and the 16h strength will not reach 48Mpa. Indicator requirements

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