{"id":19016,"date":"2025-10-17T16:23:18","date_gmt":"2025-10-17T14:23:18","guid":{"rendered":"https:\/\/www.darda.de\/chemical-demolition-method"},"modified":"2026-03-30T13:06:02","modified_gmt":"2026-03-30T11:06:02","slug":"chemical-demolition-method","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/chemical-demolition-method","title":{"rendered":"Chemical demolition method"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>The <em>chemical demolition method<\/em> is a low-vibration way to separate concrete and natural stone in a controlled manner. It is used when blasting vibrations must be avoided, crack propagation controlled, and sensitive environments protected. In practice, the structure preconditioned by chemical crack induction is then usually released mechanically and separated by material type &#8211; often with <strong>concrete demolition shears<\/strong> and <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">hydraulic rock and concrete splitters<\/a>, powered by <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">compact hydraulic power units<\/a>. The method is relevant for concrete demolition and special demolition, building gutting and cutting, rock excavation and tunnel construction, natural stone extraction, as well as special operations. In many specifications it is also referred to as non-explosive demolition with expansive mortar and is planned as part of an integrated process chain with hydraulic tools.<\/p>\n<h2>Definition: What is meant by the chemical demolition method?<\/h2>\n<p>The chemical demolition method refers to processes in which non-explosive, chemically reactive media &#8211; typically expansive mortars (expansion grouts) &#8211; are introduced into concrete or rock via boreholes. The chemically induced volumetric expansion generates controlled tensile stresses and cracks that divide the component into defined blocks. The process is time-delayed, low-vibration, and low-noise. The released segments are then mechanically removed, crushed, and hauled away, for example with concrete demolition shears, rock splitting cylinders, multi cutters, combination shears, or steel shears for reinforcement. The method is blast-free and suitable for selective deconstruction and for areas with strict requirements regarding noise, vibration, and dust.<\/p>\n<p><strong>Reaction times<\/strong> depend on system type and ambient conditions and typically range from a few hours to one working day. Target block sizes, separation planes, and reinforcement layout are defined in advance to ensure predictable follow-up with hydraulic tools.<\/p>\n<h2>Operating principle and chemical fundamentals<\/h2>\n<p>Expansive mortar is usually based on reactive binders that undergo an exothermic hydration when mixed with water. A high, gradually increasing expansive and contact pressure develops in the boreholes. This pressure exceeds the local tensile strength of concrete or natural stone, causing cracks to form between the boreholes. The crack pattern can be controlled via hole diameter, depth, grid spacing, and the sequence of placement. Temperature and humidity influence the reaction rate; excessive temperatures can cause premature gas formation, while low temperatures slow crack formation.<\/p>\n<p>Depending on formulation and curing conditions, expansive mortars can develop very high pressures sufficient to open cracks along the planned joints. Reliable performance requires clean, well-dimensioned boreholes and consistent mixing to avoid segregation and local overpressure. Avoiding completely airtight hole closures reduces the risk of blowouts and facilitates controlled pressure release.<\/p>\n<h3>Reaction control and boundary conditions<\/h3>\n<ul>\n<li><strong>Temperature window<\/strong>: Cool substrates slow hydration, warm substrates accelerate it. Manufacturer-specific minimum and maximum temperatures must be observed to prevent delayed cracking or gas formation.<\/li>\n<li><strong>Substrate condition<\/strong>: Slightly moist hole walls promote heat dissipation and adhesion. Standing water in holes must be removed prior to filling.<\/li>\n<li><strong>Hole geometry<\/strong>: Diameter, depth, spacing, and edge distances determine crack initiation and continuity. Uniform grids improve predictability.<\/li>\n<li><strong>Mix quality and dosing<\/strong>: Accurate water ratio and thorough mixing ensure consistent expansion. Partial fills or air pockets can disrupt crack paths.<\/li>\n<li><strong>Sequencing<\/strong>: Staggered filling can steer crack propagation and reduce peak loads in sensitive areas.<\/li>\n<\/ul>\n<p>The chemically induced pre-damage significantly reduces the material resistance. As a result, subsequent steps &#8211; such as secondary splitting with rock and concrete splitters or targeted biting with concrete demolition shears &#8211; can be carried out in a more controlled, quieter way and with lower energy input.<\/p>\n<h2>Applications and suitability<\/h2>\n<p>The chemical demolition method is suitable when precision and low environmental impact are paramount. Typical use cases include:<\/p>\n<ul>\n<li>Concrete demolition and special demolition of massive foundations, walls, and slabs<\/li>\n<li>Building gutting and cutting in existing structures with immediate neighboring use<\/li>\n<li><a href=\"https:\/\/www.darda.de\/en\/applications\/rock-demolition-and-tunnel-construction\">rock demolition and tunnel construction<\/a> when vibrations must be limited<\/li>\n<li>Natural stone extraction to release blocks along defined cracks<\/li>\n<li>Special operations, for example on hard-to-access components or in areas with elevated protection requirements<\/li>\n<li>Selective removal near utilities and sensitive assets where vibration and noise windows are tight<\/li>\n<\/ul>\n<h3>Sensitive environments<\/h3>\n<p>In hospitals, laboratories, or listed buildings, low vibration and controlled crack guidance are crucial. The chemical approach minimizes secondary damage to adjacent components. The released pieces can then be cut off with concrete demolition shears and reduced to manageable sizes. Supplementary measures such as partitioning, negative pressure zones, and misting reduce dust and protect adjacent uses.<\/p>\n<h3>Massive components and rock<\/h3>\n<p>With very thick cross-sections or hard rock, chemical crack induction enables pre-weakening. Rock splitting cylinders and rock and concrete splitters then engage at the separation joints formed and widen them in a controlled manner. This significantly reduces the effort required for mechanical size reduction. Stepwise sequences with intermediate verification help maintain directional control over crack growth in complex geometries.<\/p>\n<h2>Workflow in practice<\/h2>\n<p>The typical workflow combines chemical crack formation with mechanical follow-up:<\/p>\n<ol>\n<li>Analysis of as-built conditions, material, reinforcement, and boundary conditions<\/li>\n<li>Planning of drilling pattern, hole diameter, depth, and grid<\/li>\n<li>Creation of boreholes and cleaning of the drill channels<\/li>\n<li>Mixing and placement of the expansive mortar in accordance with the manufacturer\u2019s instructions<\/li>\n<li>Controlled crack formation within the intended reaction time<\/li>\n<li>Mechanical follow-up: re-splitting, biting, cutting, and sorting<\/li>\n<li>Removal, recycling, and disposal of the material fractions<\/li>\n<li>Verification and handover: check of separation quality, documentation, and clearing for subsequent trades<\/li>\n<\/ol>\n<h2>Drilling pattern, dosing, and time management<\/h2>\n<p>The quality of the result is largely determined by the drilling pattern. Tighter grids promote uniform crack formation but increase drilling effort. Hole diameter is based on component thickness and the mortar system. Hole depth and edge distances must be chosen to enable the desired crack propagation without uncontrolled spalling. Uniform hole filling and avoiding airtight seals reduce the risk of blowouts.<\/p>\n<p>Temperature management is essential: cold components slow the process, warm components accelerate it. Shading, moistening of hole walls (without standing water), and adjusting the mix water temperature help control reaction times. The time window between filling and mechanical follow-up must be defined for the project.<\/p>\n<h3>Practical parameter guidelines<\/h3>\n<ul>\n<li><strong>Hole diameter<\/strong>: typically aligned with system guidance and component thickness.<\/li>\n<li><strong>Hole depth<\/strong>: commonly 80 to 95 percent of component thickness to maintain control at the back face.<\/li>\n<li><strong>Spacing<\/strong>: selected to balance drilling effort and crack continuity; closer spacing in high-strength or heterogeneous substrates.<\/li>\n<li><strong>Edge distances<\/strong>: sufficient offsets to prevent edge breakout where surfaces must be preserved.<\/li>\n<li><strong>Dosing and fill height<\/strong>: consistent to avoid pressure peaks and voids; avoid complete sealing at the top.<\/li>\n<\/ul>\n<h3>Reinforced concrete<\/h3>\n<p>In reinforced components, the reinforcement limits crack opening. After chemical pre-damage, concrete demolition shears are used to separate the concrete from the reinforcement. Steel shears or multi cutters then cut the exposed bars. This results in clean separation of concrete and steel by material type. Pre-cuts along cover zones with saws or small bites can further protect visible surfaces and accelerate bar exposure.<\/p>\n<h2>Combination with hydraulic tools<\/h2>\n<p>The greatest efficiency arises from coordinated process chains. After crack induction, hydraulic tools supplied by hydraulic power packs follow with clear roles:<\/p>\n<ul>\n<li>Rock and concrete splitters as well as rock splitting cylinders widen the formed separation joints and divide the material more precisely.<\/li>\n<li>Concrete demolition shears crush released segments, remove residual bridges, and finish edges.<\/li>\n<li>Combination shears and multi cutters process mixed materials; steel shears cut reinforcement; tank cutters are used for special steel tanks or pipelines.<\/li>\n<\/ul>\n<p>Chemical pre-damage lowers the required cutting and splitting forces. This reduces tool loads, accelerates secondary demolition, and improves occupational safety. Matching tool size, jaw geometry, and hydraulic power to the planned block mass minimizes idle time and changeovers.<\/p>\n<h2>Advantages and limitations<\/h2>\n<ul>\n<li>Advantages: low vibration, low noise, precise crack control, low risk of dust and flying fragments, well-plannable sequence.<\/li>\n<li>Limitations: waiting times until crack formation, temperature sensitivity, increased drilling effort, limited effect in heavily reinforced zones without subsequent mechanical separation.<\/li>\n<\/ul>\n<p>When selecting the method, boundary conditions such as access, permissible emissions, schedule, and disposal routes must be balanced against drilling capacity and available tool sets.<\/p>\n<h2>Occupational safety and environmental protection<\/h2>\n<p>Safe handling requires personal protective equipment, low-dust drilling, and an exclusion zone during the reaction phase. Boreholes must not be sealed airtight; this reduces the risk of blowouts. Splashes must be avoided during processing, as expansive mortars can be strongly alkaline. Good ventilation, coordinated signaling, and documented clearance before mechanical follow-up increase safety.<\/p>\n<p>From an environmental perspective, pH values and potential entries into soil or water bodies must be considered. Residual mortar and rinsings must be collected and disposed of properly. Measures for dust and noise reduction, separation by material type, and recycling of fractions must be planned on a project basis and should comply with applicable codes and regulatory requirements.<\/p>\n<h3>Site setup, PPE, and handling<\/h3>\n<ul>\n<li><strong>PPE<\/strong>: chemical-resistant gloves, eye and face protection, suitable clothing, and respiratory protection for drilling dust.<\/li>\n<li><strong>Mixing and filling<\/strong>: splash protection, controlled mixing speeds, and immediate cleanup of spills; prevent unplanned contact with reinforcement or embedded items.<\/li>\n<li><strong>Exclusion zone<\/strong>: cordon off areas until crack formation is verified; use signage and access control.<\/li>\n<li><strong>Ventilation<\/strong>: ensure adequate air exchange in enclosed spaces to manage heat and any vapors.<\/li>\n<li><strong>Emergency measures<\/strong>: provide washing facilities and first-aid instructions for alkaline exposure.<\/li>\n<\/ul>\n<p>Permitting, neighbor communication, and time windows for noisy works should be agreed in advance. Transport, storage, and disposal routes are organized to avoid cross-contamination and to support selective recycling.<\/p>\n<h2>Quality assurance and documentation<\/h2>\n<p>For reproducible results, mixing ratios, temperatures, times, drilling parameters, and crack development are documented. Before deploying concrete demolition shears or splitters, crack development is to be checked visually. Tool selection, hydraulic power, and accessibility must be aligned with the planned block size. Ongoing photo documentation facilitates verification and optimization.<\/p>\n<ul>\n<li><strong>Typical acceptance checks<\/strong>: continuity of separation joints, block dimensions versus plan, absence of uncontrolled spalling, and readiness for mechanical follow-up.<\/li>\n<li><strong>Trials<\/strong>: small-scale pilot fields under site conditions calibrate spacing, depth, and timing before full rollout.<\/li>\n<li><strong>Recording<\/strong>: capture temperatures, reaction times, mortar batches, and any deviations to inform subsequent shifts.<\/li>\n<\/ul>\n<h2>Cost-effectiveness and project planning<\/h2>\n<p>The cost structure is determined by drilling performance, mortar consumption, reaction times, and the efficiency of the mechanical follow-up. Early alignment of the drilling pattern and the planned use of rock and concrete splitters or concrete demolition shears avoids double steps. Hydraulic power packs, shears, and cutters should be matched to site logistics in terms of output and hose lengths to minimize changeover times.<\/p>\n<p>Reliable schedules factor in temperature-driven reaction variability, shift models for follow-up works, and buffer times before removal and transport. Coordinated batch sizes for mixing reduce waste and keep tool utilization high.<\/p>\n<h2>Practical application scenarios<\/h2>\n<p>In inner-city existing buildings, the chemical demolition method facilitates the gutting of load-bearing elements without affecting neighboring buildings. The resulting blocks are reduced to transportable sizes with concrete demolition shears. In tunnel construction and rock removal, chemical crack induction enables low-vibration loosening before rock splitting cylinders and rock and concrete splitters produce the defined separations. In natural stone extraction, controlled crack formation enables gentle block release, followed by mechanical finishing. In special operations involving mixed materials, combination shears, multi cutters, steel shears, or tank cutters are additionally used to complete separation by material type.<\/p>\n<p>Selection is based on emission limits, access, substrate composition, and required finish quality. Pilot sections, measured crack development, and iterative adjustment of drilling grids provide the basis for robust, low-risk execution.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The chemical demolition method is a low-vibration way to separate concrete and natural stone in a controlled manner. It is used when blasting vibrations must be avoided, crack propagation controlled, and sensitive environments protected. In practice, the structure preconditioned by chemical crack induction is then usually released mechanically and separated <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/chemical-demolition-method\">read more&#8230;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"parent":14846,"menu_order":0,"comment_status":"open","ping_status":"open","template":"tmpl\/template-wissen.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-19016","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chemical Demolition Method for Concrete &amp; Rock<\/title>\n<meta name=\"description\" content=\"Low vibration \u2713 The chemical demolition method uses non-explosive mortar for controlled cracking in concrete &amp; rock.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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