Durable polymer mortar for high-strength steel wire cloth reinforced concrete member

Abstract

The invention relates to the technical field of building material mortar preparation, in particular to durable polymer mortar for a high-strength steel wire cloth reinforced concrete member. The concrete is prepared from the following raw materials in parts by weight: 45-55 parts of a cementing material, 38-45 parts of graded quartz sand, 3-5 parts of polymer rubber powder, 0.2-0.4 part of a water reducing agent, 0.05-1 part of a thixotropic agent, 0.05-0.2 part of a retarder, 0.05-0.2 part of a coagulant, 0.1-0.2 part of PP fibers and 3-5 parts of a freeze-thaw-resistant and rust-resistant compacting agent. The ordinary Portland cement and the sulphoaluminate cement are compounded to serve as the reinforcing mortar of a main cementing material, the shrinkage value of the reinforcing mortar is small, the later strength is good, the cement-based mortar is modified through the polymer rubber powder and the freeze-thaw-resistant rust-resistant compacting agent, and the anti-freezing and anti-rust performance of the reinforcing mortar is improved. The bonding strength between the repairing mortar and an original concrete base layer, the bond stress between the repairing mortar and the high-strength steel wires and the durability of the high-strength steel wire-polymer mortar reinforcing layer, such as water resistance, freeze thawing resistance and chloride ion permeation resistance, are improved.

Description

technical field [0001] The invention relates to the technical field of building material mortar preparation, in particular to a durable polymer mortar for reinforcing concrete members with high-strength steel wire cloth. Background technique [0002] Reinforced concrete is the most widely used building material in construction engineering. However, due to a series of factors such as the increase of service life, the use environment or the impact of disasters, the performance of the concrete structure has deteriorated and the structural safety has been seriously endangered, or the use of the original building has to be changed, or the original building has been If the requirements of the current new standards and specifications cannot be met, or some new concrete projects do not meet the design requirements due to design, construction and other reasons, they need to be repaired and strengthened. my country's construction industry has begun to move from the first development ...

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Problems solved by technology

However, in the prior art, ordinary portland cement is used as cementitious mortar for reinforcement, which has a long curing period, large shrinkage, and easy cracking, which is likely to cause low bond strength between the new mortar and the old concrete interface; Reinforcement mortar as the main cementitious material develops quickly in the early stage of strength, but it is prone to the problem of strength shrinkage in the later stage. Freeze-thaw resistance and rust resistance, because the high-strength steel wire bundles in the mortar layer are different from those in concrete, the diameter of the steel wire bundles is thin, and the thickness of the protective layer is small. In the prior art, 2011101630688 a high-performance structural reinforcement mortar composition and its preparation process, and 201410239189X a special reinforcement mortar for wharf concrete structures can improve and enhance the durability of the reinforcement mortar itself, but there is no relationship between mortar and Performance indicators of high-strength steel wire

Due to the characteristics of thinner high-strength steel wire and smooth surface, it lacks chemical bonding force, mechanical occlusal force and frictional force with mortar, and it will slip during the joint stress process with mortar. Poor grip strength and poor comprehensive durability; therefore, it is urgent to propose a durable polymer mortar for high-strength steel wire cloth reinforced concrete members, and has a high cost performance

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