Concrete spacer PCA-35/40/45/50

2. OVERVIEW – WHAT IS THE 35–40–45–50MM MULTI-SIZE CONCRETE SPACER PCA-35/40/45/50?

The 35–40–45–50mm multi-size concrete spacer PCA-35/40/45/50 is a multi-sided concrete spacer used to maintain rebar clearance from formwork at cover levels of 35mm, 40mm, 45mm, and 50mm. This product series is suitable for beams, columns, shear walls, and footings with lean concrete blinding, where spacers are required to function vertically or horizontally and reliably maintain the distance between the steel frame and the formwork surface. The key characteristic of PCA-35/40/45/50 is its broad height range from 35mm to 50mm, suitable for projects requiring fast switching between beams, columns, walls, and footings. By rotating the spacer to the correct side, construction crews can adjust the cover depth without switching to a different product code. The selection of the seating surface and fixing method must conform to structural drawings, rebar diameter, and approved construction methods.

3. KEY FEATURES AND STRUCTURE

PCA-35/40/45/50 features four working heights providing protective cover depths of 35mm, 40mm, 45mm, and 50mm. Its multi-sided design allows rotating the spacer to select the required clearance, which is particularly useful when a project involves multiple structural elements or zones requiring varying cover depths. Regarding its function, the product creates clearance between rebar and formwork in beams, columns, shear walls, and footings with lean concrete blinding. It offers a broad height range from 35mm to 50mm, suitable for projects requiring fast switching between beams, columns, walls, and footings. When used vertically, spacers must be securely attached to the steel frame according to construction procedures to prevent slipping, rotation to the wrong side, or changing cover depth during formwork installation. Structurally, it consists of a monolithically cast concrete body with recessed surfaces designed to cradle rebar bars. Each working side corresponds to a specific cover height; therefore, correct dimension identification is essential prior to installation. Unlike flat-base spacers, multi-size spacers should not be placed arbitrarily, as the orientation directly determines the protective concrete cover thickness.

4. USER GUIDE

1. Determine the required cover depth among 35mm, 40mm, 45mm, and 50mm and identify the corresponding spacer side. 2. Rotate the spacer to the correct orientation; place the rebar into the recessed groove and secure it to the steel frame when installing for columns, walls, or vertical members. 3. Verify that spacers do not slip, rotate to the wrong side, or jam between rebar and formwork before closing the forms. 4. After completing the rebar frame, perform random spot-check measurements of the clearance to formwork at multiple locations. Spacer placement density depends on steel cage rigidity, bar diameter, stirrup pitch, and construction loads. Increase spacer density at column corners, wall edges, bar ends, lap splices, or areas prone to frame deformation per construction procedures.

5. TESTING AND QUALITY CONTROL

The 35–40–45–50mm multi-size concrete spacer PCA-35/40/45/50 undergoes quality control per production batch, covering appearance, dimensions, working height, rebar support surface, packaging specifications, and sample load capacity. Prior to usage, clients should verify product codes on packaging, quantity, crack/damage status, and working dimensions against project requirements. Each factory-shipped batch includes a Product Sample Inspection Certificate, detailing product code, batch code, sampling date, test parameters, results, and quality conclusions. The inspection certificate serves to cross-reference received shipments and is retained in material quality management records.