Concrete mending mortar additive and formulating method for mending mortar

Abstract

The invention discloses a method for preparing a patch mortar additive and patch mortar for concrete. The additive comprises a component A which comprises the following substances in portion by weight: 4 to 8 portions of silica powder, 10 to 12 portions of S105 slag powder, 8 to 10 portions of I-grade fly ash, 8 to 10 portions of UEA swelling agent, 0.3 to 0.5 portion of polycarboxylate type superplasticizer (powder), and 0.3 to 0.4 portion of polypropylene fiber. Further, the additive can also comprises a component B consisting of phenylpropyl emulsion, water, organosilicon antifoaming agent and OP-10 nonionic surfactant. The method for preparing the patch mortar for the concrete comprises the following steps: weighing the following substances in portion by weight: 100 portions of cement, 200 to 300 portions of yellow sand, and 30 to 40 portions of the component A; and after the mixture is mixed and stirred evenly, gradually adding the water or the component B into the mixture, and mixing and stirring the mixture to form the mortar of which the consistency is between 30 and 70 millimeters. The patch mortar can be well combined with the prior concrete, and can be used for patching concrete cracks and patching concrete defects and corroded and damaged surfaces.

Description

technical field [0001] The invention designs an additive for repairing mortar for concrete defects and surface erosion damage. Background technique [0002] With the increase of the service life of reinforced concrete buildings, the concrete is continuously subjected to deterioration such as carbonization, chloride ion erosion, and freezing corrosion. When the deterioration reaches the surface of the steel bars, the corrosion of the steel bars will lead to corrosion cracks along the bars, concrete spalling, and exposed steel bars. In addition, the pavement of roads and bridges is easy to be worn, and the structural components in the high-speed water flow area are washed by the water flow, and the exposed rocks on the concrete surface are abraded. [0003] At present, there are three main types of repair materials for reinforced concrete components such as steel corrosion joints, exposed reinforcement, abrasion and other diseased parts: cement mortar, resin mortar, and polyme...

AI Technical Summary

Problems solved by technology

The bonding strength between cement mortar and old concrete is low, easy to shrink, and the repair effect is not good; the price of resin mortar such as epoxy mortar is as high as 20,000 yuan / m 3 above, and its shrinkage is large, which is several times different from the linear expansion coefficient of concrete, and it is easy to fall off after repair; the price of polymer cement mortar is relatively high, and some polymer mortars have poor adaptability to temperature deformation, and the repair layer is easy to fall off from the base concrete. Open, polymer emulsion has different degrees of retarding effect on cement mortar, and the compressive strength of different types of polymer cement mortar is lower than that of ordinary cement mortar.