Concrete cushion block and preparation technology thereof

Abstract

The invention relates to a concrete cushion block and a preparation technology thereof, belonging to the technical field of a strutting piece for a building. The concrete cushion block is characterized in that a cushion block body comprises the following raw materials in parts by weight: 100 parts of cement, 460-520 parts of aggregate chips, and 42-61 parts of water, wherein the aggregate chips and water are mixed according to the ratio of 1:0.2-0.12, and according to the difference of particle sizes D of aggregate chips, the mass percentages are as follows: the aggregate chips with D of no more than 0.1cm accounts for 40-50%, the aggregate chips with D of more than 0.1cm and no more than 0.2cm accounts for 20-25%, the aggregate chips with D of more than 0.2cm and no more than 0.3cm accounts for 15-20%, and the aggregate chips with D of more than 0.3cm and no more than 0.5cm accounts for 12-15%. According to the technology, a reinforcement steel bar slot is formed in the side surface, and demolding and maintenance are immediately conducted after pressing is conducted for 1-4s. The cushion block is short in maintenance time, high in early strength, adaptive to concrete of buildings, convenient and fast in technological process, firm and difficult to loose, short in preparation period and convenient to use.

Description

technical field [0001] A concrete cushion block and its preparation process belong to the technical field of building supports. Background technique [0002] During the construction of reinforced concrete building structures, it is necessary to bind the steel frame before pouring the concrete. During the tying process of the horizontal steel frame, it is necessary to add pads between the formwork and the steel bars to determine the thickness of the concrete member’s protective layer and ensure that the bottom surface of the steel frame is at the same height. Inconsistent specifications of the pads will lead to exposed bars. [0003] At present, the raw materials of concrete pads are mainly cement and sand, and some concrete pads use stone chips instead of part of sand as the raw materials of concrete pads. With the implementation of environmental protection policies, it is an inevitable trend that the use of river sand and sea sand will be replaced. It is imperative to pre...

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Problems solved by technology

However, the inventor has found in practice that there are many problems in the process of preparing concrete pads by using stone chips to completely replace sand: 1. The pad preparation cycle is long, and the maintenance time required after pressing is long, and the maintenance needs to be done within 14 2. The strength of the pad is low, and it is easy to cause damage or cracks during the laying and maintenance of steel bars. It is troublesome to replace the pad after the reinforcement frame is tied; 3. The pad only considers the height standard requirements when laying the pad. , do not pay attention to the bonding strength between the pad and the pad after the concrete is poured; 4. The pad and the concrete basic structure of the building have different expansion and contraction ratios, causing the pad to fall off, the contact surface to crack, and the moisture in the air to infiltrate from the gap to the surface of the steel bar, causing electrochemical corrosion of the steel bar, and the corroded steel bar will expand in volume to further damage the concrete structure and shorten the service life of the building; One side of the concrete pad is pressed down to form the reinforcement groove, because the fluidity gap of concrete between different batches or / and the pressure of different pressing tools are different, so that the distance between the bottom of the reinforcement groove of the concrete pad and the bottom surface of the pad body is not uniform, Unevenness of the steel bar surface when laying the steel bar

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