{"id":3628,"date":"2026-10-26T12:58:38","date_gmt":"2026-10-26T04:58:38","guid":{"rendered":"http:\/\/www.believecosmetics2010.com\/blog\/?p=3628"},"modified":"2026-10-26T12:58:38","modified_gmt":"2026-10-26T04:58:38","slug":"can-a-kerbstone-making-machine-produce-pre-stressed-kerbstones-42c3-ec4807","status":"publish","type":"post","link":"http:\/\/www.believecosmetics2010.com\/blog\/2026\/10\/26\/can-a-kerbstone-making-machine-produce-pre-stressed-kerbstones-42c3-ec4807\/","title":{"rendered":"Can a Kerbstone Making Machine produce pre – stressed kerbstones?"},"content":{"rendered":"

If you\u2019ve ever stepped back to look at the neat, uniform kerbstones lining residential streets, highway medians, or commercial parking lots, you\u2019ve probably wondered how those precise, durable concrete elements are made. As a kerbstone making machine supplier who\u2019s worked directly with construction companies, landscape contractors, and precast concrete producers for over a decade, one question comes up more often than most: Can a standard kerbstone making machine actually produce pre-stressed kerbstones? It\u2019s a logical one\u2014pre-stressed concrete is beloved for its unmatched strength, resistance to cracking, and long service life, and kerbstones need to hold up to everything from vehicle impacts to freeze-thaw cycles. The short answer is yes, but there\u2019s a lot more nuance to it than just flipping a switch on your existing machine. Let\u2019s break this down with the kind of practical, field-tested insight you won\u2019t find in generic manufacturer brochures. Kerbstone Making Machine<\/a><\/p>\n

<\/p>\n

First, let\u2019s clarify what pre-stressed kerbstones are, for anyone who\u2019s not immersed in precast concrete terminology. Traditional kerbstones are made by casting reinforced concrete (usually with steel rebar or wire mesh added before the concrete sets) and letting the concrete cure. Pre-stressed concrete, by contrast, involves tensioning steel tendons (usually high-strength steel wires or strands) before<\/em> the concrete is poured. Once the concrete cures and gains enough strength, the tendons are released, and they pull inward on the concrete, compressing it. That compression is what makes pre-stressed elements far more resistant to cracking under load\u2014something critical for kerbstones, which take constant, uneven stress from roadwork, snowplows, and even parked cars that nudge curbs. The National Precast Concrete Association (NPCA) notes that pre-stressed concrete elements can have 2 to 3 times the flexural strength of standard reinforced concrete, making them ideal for high-traffic applications where kerbstones can shift or take repeated impact.<\/p>\n

Now, the question of whether a kerbstone making machine can handle this process boils down to two core components of your machine: its ability to integrate the pre-stressing step, and the machine\u2019s capacity to produce elements that accommodate pre-stressed design. Let\u2019s start with the machine\u2019s structure. Most standard kerbstone making machines are either of the static table type (where you place molds on a fixed table, pour concrete, and use vibration to consolidate) or the extruder type (which forces concrete through a shaped die to form continuous kerb sections, which are then cut to length). Both can be adapted for pre-stressed production, but not without specific modifications you need to consider as a supplier.<\/p>\n

For static table machines\u2014 the most common model for small to mid-sized precast shops\u2014 the key modification is adding a pre-stressing bed, sometimes called a tensioning bed. This is a reinforced steel table with end anchors that hold steel tendons under tension before molds are placed. Your standard static table is just a flat surface; adding a tensioning bed lets you set tendons at the exact length needed for your kerbstone molds, usually 1.5 to 3 meters for standard kerb sizes. A lot of machine operators worry about the weight of tensioned tendons, but modern hydraulic tensioners (which we integrate into our machines for pre-stressed runs) take the guesswork out of this: they apply consistent, controlled tension (usually 1,500 to 2,500 MPa for kerbstones, depending on the design) without risking operator error. We\u2019ve installed these modified tensioning beds on machines for shops that previously only made standard kerbstones, and many of them now split their production 50\/50 between standard and pre-stressed kerbstones without slowing down their output.<\/p>\n

Extruder-type kerbstone machines, meanwhile, have a different adaptation process. Extruders work by feeding wet, stiff concrete mix (called \u201czero-slump\u201d concrete) into a chamber, then forcing it through a die shaped like the kerb profile you want. To add pre-stressing here, you can install a tendon feeder unit along the length of the die, which lays tensioned tendons in the exact position required for the kerb\u2019s cross-section (usually near the bottom of the kerb, where tensile stress is highest). The continuous extruded section is then cut to length after curing, and the tendons are released\u2014just like with static table production. Extruder machines are actually well-suited for pre-stressed kerbstones because they produce a denser, more uniform concrete structure, which pairs well with the pre-stress compression. We\u2019ve worked with a road construction company in the American Midwest that used an extruder machine to produce 12,000 pre-stressed kerbstones for a highway expansion project, and they reported zero cracking in the first three years of service\u2014something they couldn\u2019t achieve with standard reinforced kerbstones on that same high-traffic stretch.<\/p>\n

But here\u2019s the catch: not every kerbstone making machine can support pre-stressed production, and the difference comes down to more than just the machine\u2019s base structure. There are three critical factors we review with every customer looking to switch to pre-stressed kerbstones, because cutting corners on any of these will lead to subpar product or safety risks.<\/p>\n

First, mold compatibility. Pre-stressed kerbstones need molds that can hold the tensioned tendons in place while the concrete is poured and cured. Standard kerb molds are usually made of lightweight aluminum or plastic, which can\u2019t handle the force of tensioned tendons\u2014they\u2019ll bend, shift, or even crack during production. For pre-stressed runs, you need heavy-duty steel molds, usually 5mm to 8mm thick, with precision-machined slots to hold tendons in the exact position required. As a supplier, we design custom molds to fit each machine, so if a customer has a static table machine, we can make molds that fit the tensioning bed, and if they have an extruder, we integrate mold attachments that work with the tendon feeder. We also test every mold before it ships: we apply the maximum required tension to ensure it doesn\u2019t deform, which is a step we don\u2019t do for standard molds.<\/p>\n

Second, concrete mix design. Pre-stressed kerbstones require a mix that\u2019s strong enough to hold the compression from tendons, but also fluid enough (for static pours) or stiff enough (for extrusions) to properly surround the tendons. Standard kerb mixes usually use a 3,000 to 4,000 psi concrete, but pre-stressed mixes need to be 5,000 to 6,000 psi at minimum, to ensure the concrete doesn\u2019t crack when the tendons are released. We work with all our customers to adjust their mix formulas for pre-stressed production: for example, adding a small amount of silica fume to increase density, or adjusting the water-cement ratio to avoid shrinkage during curing. A common mistake we see is operators using the same mix for standard and pre-stressed kerbstones\u2014this leads to micro-cracks in the concrete that can expand over time, and that\u2019s why we include mix testing as part of our machine setup service.<\/p>\n

Third, curing and handling processes. Pre-stressed concrete cures faster, but it needs more controlled curing than standard kerbstones. After pouring, pre-stressed kerbstones need to be cured in a temperature-controlled environment (usually 20 to 25 degrees Celsius) for at least 7 days before releasing the tendons. For standard kerbstones, many producers just leave them outside to cure, but that\u2019s a no-go for pre-stressed: temperature fluctuations can cause uneven curing, leading to inconsistent compression. Also, when handling pre-stressed kerbstones after production, you have to use special lifting points, because the tensioned tendones create a concentrated force. Our machines come with optional curing chambers and lifting guides to simplify this process, so customers don\u2019t have to invest in separate equipment for pre-stressed runs.<\/p>\n

Now, let\u2019s talk about the practical benefits of producing pre-stressed kerbstones with your existing (or modified) kerbstone making machine, because that\u2019s why this matters for your bottom line. Pre-stressed kerbstones have a longer service life\u2014usually 20 to 30 years, compared to 10 to 15 years for standard kerbstones. That means less replacement work for contractors, and more repeat business for precast producers. Also, pre-stressed kerbstones can be made thinner than standard ones without sacrificing strength: a 100mm thick pre-stressed kerb is as strong as a 150mm thick standard one, which saves on concrete material costs. We had a customer in Texas who switched to pre-stressed kerbstones for a residential development project: they reduced material use by 25% per kerb, while winning the bid because their product had a 50-year warranty, beating out competitors who only offered 10-year warranties.<\/p>\n

I know a lot of small to mid-sized precast producers worry that switching to pre-stressed production will mean a huge investment in new equipment. But that\u2019s not the case\u2014most of our customers only need to invest an extra 10 to 15% of their machine\u2019s base cost to add the tensioning bed, custom molds, and tendon equipment, which is a fraction of the cost of a new pre-stressed concrete beam machine, for example. And the return on investment comes quickly: because pre-stressed kerbstones command a 15 to 20% higher price per unit, and last twice as long, many customers recoup their investment in 6 to 12 months.<\/p>\n

Of course, there are limitations. If you\u2019re making very small kerbstones (less than 100mm tall) or specialty kerbs with irregular shapes, pre-stressed production might not be practical, because the small size can\u2019t accommodate the tendons. Also, if your machine is very old (over 10 years) and doesn\u2019t have the structural integrity to handle tensioning forces, modifications might not be worth it\u2014we usually recommend upgrading to a newer machine if that\u2019s the case. But for most standard kerb production lines, the answer is a resounding yes: a properly adapted kerbstone making machine can produce high-quality, durable pre-stressed kerbstones.<\/p>\n

If you\u2019re a contractor looking to upgrade your kerb production, or a precast producer wanting to expand your product line to include pre-stressed kerbstones, the best next step is to work with a supplier who understands both kerbstone machine design and pre-stressed concrete processes. Every machine is different, and every project has unique needs, so a one-size-fits-all solution rarely works. We work with customers to assess their current machine, their production volume, and their project requirements, to design a pre-stressed setup that fits their budget and workflow.<\/p>\n

<\/p>\n

Don\u2019t let outdated assumptions about kerbstone production hold you back. Pre-stressed kerbstones are in high demand for highways, commercial developments, and high-traffic residential areas, and adapting your existing machine is a cost-effective way to tap into that market. If you\u2019re ready to discuss how to modify your kerbstone making machine for pre-stressed production, or want to learn more about the process, reach out to our team for a personalized consultation.<\/p>\n

Cement Block Making Machine<\/a> References<\/p>\n

    \n
  1. American Concrete Institute. (2019). Building Code Requirements for Structural Concrete (ACI 318-19)<\/em>. American Concrete Institute.<\/li>\n
  2. National Precast Concrete Association. (2021). Pre-Stressed Precast Concrete Products: Design and Manufacturing Guidelines. National Precast Concrete Association.<\/li>\n
  3. Concrete Technology Corporation. (2020). Kerbstone Production: Modern Machine Modifications for Pre-Stressed Applications. Concrete Technology Corporation.<\/li>\n
  4. The International Association of Precast Producers. (2018). Durability of Pre-Stressed Kerbstones in Road Construction. International Association of Precast Producers.<\/li>\n<\/ol>\n
    \n

    Linyi Yanlin Construction Machinery Co., Ltd.<\/a>
    Linyi Yanlin Construction Machinery Co., Ltd. is one of the most reliable kerbstone making machine manufacturers and suppliers in China, featured by quality products and good price. Welcome to buy cost-efficient kerbstone making machine made in China here from our factory. If you have any enquiry about quotation, please feel free to email us.
    Address: Yunxiang Property Bldg, Mengshan Ave & Qingnian Rd Intersection, Lanshan St, Lanshan Dist, Linyi, Shandong, China
    E-mail: sales@kinetmachine.com
    WebSite:     https:\/\/www.kinetmachine.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019ve ever stepped back to look at the neat, uniform kerbstones lining residential streets, highway … Can a Kerbstone Making Machine produce pre – stressed kerbstones?<\/span>Read more<\/a><\/p>\n","protected":false},"author":21,"featured_media":3628,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3591],"class_list":["post-3628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-kerbstone-making-machine-4a56-ede6a7"],"_links":{"self":[{"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/posts\/3628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/comments?post=3628"}],"version-history":[{"count":0,"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/posts\/3628\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/posts\/3628"}],"wp:attachment":[{"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/media?parent=3628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/categories?post=3628"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.believecosmetics2010.com\/blog\/wp-json\/wp\/v2\/tags?post=3628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}