Grouting material for sleeve connection of prefabricated concrete components of prefabricated buildings and preparation method thereof

Abstract

The invention discloses a grouting material for sleeve connection of prefabricated concrete components of an assembled building, which belongs to the technical field of cement-based grouting material, and the key point of the technical scheme is that it includes the following components in parts by weight: Portland cement 40-50 55-65 parts of construction sand, 6-10 parts of water reducer, 3-5 parts of early strength agent, 3-5 parts of expansion agent, 1-5 parts of shock-absorbing particles, 1-3 parts of bentonite, 1 part of mixed alcohol ‑3 parts, water 10‑18 parts. The grouting material of the invention has the characteristics of good fluidity and good compressive and flexural strength, and can still maintain high strength in low temperature environment, so it is suitable for construction in low temperature environment. The invention also correspondingly discloses a method for preparing the grouting material for the sleeve connection of the prefabricated concrete components of the prefabricated building, which has simple process steps and low cost of raw materials, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of cement-based grouting material, more specifically, it relates to a grouting material for sleeve connection of prefabricated concrete components in prefabricated buildings and a preparation method thereof. Background technique [0002] The prefabricated concrete structure is referred to as PC (Prefabricated Concrete). Its technology is to form a concrete structure with prefabricated concrete components as the main component, which is assembled, connected, and partially cast in place. Due to its convenient construction and stable and reliable quality, prefabricated concrete components are currently actively exploring the improvement of their performance at home and abroad and are gradually being used. However, the reliability of the connection of prefabricated components has always been a key factor affecting the quality of prefabricated structures. How to connect The steel bars between two prefabricated co...

AI Technical Summary

Problems solved by technology

[0005] 1. The initial fluidity is not high, resulting in tight construction time and constraints on the convenience of construction;

[0006] 2. The initial strength is insufficient to meet the progress requirements of the rapid construction of prefabricated structures;

[0007] 3. The performance of the grouting material is greatly affected by the construction season and does not have strong adaptability;

[0008] 4. The inner space of the connecting sleeve used in the grouting sleeve connection process is relatively limited, and it is required that the quantitative grouting material must provide sufficient strength;

[0009] 5. The connection direction of prefabricated components is diverse, which means that the direction of force on the connection part is also diverse. However, the strength performance of traditional grouting materials mainly focuses on compressive strength, while the flexural strength performance is very limited, making it difficult to meet multiple requirements. The connection requirements of prefabricated components in this case;

[0010] 6. The connecting sleeve exists as a kind of lateral restraint, and the traditional grouting material does not make full use of its strengthening effect on strength, and even causes unfavorable situations such as concrete shrinkage;

The grouting material reduces the dosage of the polycarboxylate water reducing agent by introducing the inorganic water reducing agent, reduces the impact of the water reducing agent on the later strength and environmental protection, increases the compactness of the grouting material, and improves the later strength of the grouting material, but the formula The addition of gypsum makes the grouting material more brittle after solidification and weak in flexural resistance, which makes it difficult to meet the connection requirements of prefabricated components in various situations; and the Chinese patent application publication number CN106830817A is a prefabricated concrete structure grouting material for prefabricated floors. The content of each component in parts by weight is: 80-100 parts of cement, 90-110 parts of fine sand, 5-8 parts of composite expansion agent, 0.4-0.6 parts of polycarboxylate superplasticizer, and 0.1-0.2 parts of defoaming agent 40-55 parts of diatom mud, 2-4 parts of polyethylene glycol, 2-4 parts of acrylic resin, 0.2-0.3 parts of dimethyl sulfoxide, 0.1-0.2 parts of sodium monofluorophosphate, 0.1 parts of dimethyl ethanolamine -0.2 parts, expanded vermiculite 1-2 parts, tourmaline 0.8-1.2 parts, strontium carbonate 0.4-0.6 parts, europium oxide 0.5-1.0 parts, dysprosium oxide 0.2-0.8 parts, methyl styrene 3-7 parts, six 0.1-0.3 parts of calcium fluoroacetylacetonate, 1.5-3 parts of lithium magnesium silicate, 0.1-0.2 parts of phenothiazine, 0.1-0.2 parts of benzotriazole, and 0.1-0.9 parts of 2-imidazolidinone. Good strength and fluidity, but its formula contains strontium carbonate, europium oxide, dysprosium oxide, tourmaline and other commonly used and expensive substances in the field of non-construction grouting materials, which greatly increases the preparation cost; among them, europium oxide can be combined with The steam volatilizes together, is alkaline, toxic, and irritating to the eyes, respiratory tract, and skin, and is not suitable for popularization and application

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