Concrete shrinkage inhibition and compensation spray liquid

Abstract

A concrete shrinkage inhibition and compensation spray. Based on a total volume of 100 wt%, the concrete shrinkage inhibition and compensation spray comprises: 4-6 wt% hydrophilic nanofibers; 55-75 wt% silica solution; and the balance water. The silica solution is a silica sol, and based on a total volume of 100 wt%, it includes 30-50 wt% nano-silica and the balance water. The hydrophilic nanofibers can form a three-dimensional water-locking network in the pores of concrete, providing a physical water-locking mechanism (internal lock). The nano-silica in the silica solution can react with calcium hydroxide in the concrete to form calcium silicate hydrate (C–S–H), forming a chemical compensation mechanism (cellica lock). The synergistic effect of these two components produces a dual-lock effect, effectively sealing pores, retaining moisture, and compensating for shrinkage volume. It can replace traditional non-shrink concrete that requires on-site mixing of expansion agent packets and is suitable for any construction scenario that requires pre-mixed concrete.

Claims

1. A concrete shrinkage inhibiting and compensating spray, comprising, based on a total amount of 100 wt%, the concrete shrinkage inhibiting and compensating spray comprising: 4-6 wt% hydrophilic nanofibers, wherein the hydrophilic nanofibers are cellulose fibers or silk fibers; 55-75 wt% silica solution, comprising, based on a total amount of 100 wt% silica solution, wherein the silica solution comprises 40 wt% nano-silica, and the balance being a dispersant selected from at least one group selected from the group consisting of water or alcohols; 0.05-2 wt% additives, comprising, based on a total amount of 100 wt% additives, wherein the additives comprise 50 wt% humectant and 50 wt% surfactant, wherein the humectant is a polyol component, and the surfactant is selected from at least one group selected from the group consisting of alkyl glycosides and polysorbates; and the balance being a solvent, wherein the solvent is water.

2. The concrete shrinkage inhibiting and compensating spray liquid as described in claim 1, wherein, Based on a total volume of 100 wt% for the concrete shrinkage inhibition and compensation spray, the concrete shrinkage inhibition and compensation spray includes 0.1 to 1 wt% of the aforementioned additives.

3. The concrete shrinkage inhibiting and compensating spray liquid as described in claim 1, wherein, The polyol component is selected from at least one of the groups consisting of polyvinyl alcohol and polyethylene glycol.

4. The concrete shrinkage inhibiting and compensating spray liquid as described in claim 1 or 3, wherein, Based on a total amount of 100wt% for the concrete shrinkage inhibition and compensation spray, the concrete shrinkage inhibition and compensation spray also contains 0.05 to 2wt% of a silane coupling agent, which is an aminoalkylalkoxysilane or an epoxyalkylalkoxysilane.

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