A kind of preparation method of water-soluble polymer surface graft modification machine-made sand

Abstract

The invention discloses a preparation method of water-soluble macromolecular surface-grafted modified machine-made sand. The method is characterized by comprising steps as follows: firstly, performing hydroxylation treatment on machine-made sand to obtain hydroxylated machine-made sand, then modifying the hydroxylated machine-made sand with a coupling agent to obtain a coupling-agent-modified machine-made sand, and enabling the coupling-agent-modified machine-made sand, acrylic acid and methyl allyl polyethenoxy ether to be subjected to grafting polymerization through a grafting polymerization reaction to obtain the water-soluble macromolecular surface-grafted modified machine-made sand. The water-soluble macromolecular surface-grafted modified machine-made sand can effectively enhance the workability and the breaking strength of machine-made sand concrete and can be widely applied to building fields of bridges, roads, railways and the like.

Description

1. Technical field: [0001] The invention relates to a preparation method of water-soluble polymer modified machine-made sand. 2. Background technology [0002] For a long time, natural sand has been widely used as fine aggregate for concrete preparation. However, with the rapid development of the construction industry, the demand for natural sand in construction projects is increasing day by day. However, as a local resource, natural sand cannot be regenerated in a short time. The existing natural sand can no longer meet the needs of engineering construction. , so the use of machine-made sand to prepare concrete has become an inevitable trend in future development. [0003] The roughness of natural sand is relatively small, the surface is smooth, and the grain shape is relatively round, while the roughness of machine-made sand is relatively large, which will increase the flow resistance of the mixture, increase the water demand, and also cause the water retention of freshly...

AI Technical Summary

Problems solved by technology

However, with the rapid development of the construction industry, the demand for natural sand in construction projects is increasing day by day. However, as a local resource, natural sand cannot be regenerated in a short period of time. The existing natural sand can no longer meet the needs of engineering construction. , so the use of machine-made sand to prepare concrete has become an inevitable trend in future development

[0003] The roughness of natural sand is relatively small, the surface is smooth, and the grain shape is relatively round, while the roughness of machine-made sand is relatively large, which will increase the flow resistance of the mixture, increase the water demand, and also cause the water retention of freshly mixed concrete. Poor cohesion, easy segregation, bleeding, difficult to meet the requirements of the preparation of high-performance concrete

According to the principle of close packing, fine aggregates with small porosity need less cementitious materials when making concrete, while the particles of machine-made sand are sharper and have larger porosity. more, this will inevitably increase the cost

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