{"id":20107,"date":"2026-01-20T08:11:03","date_gmt":"2026-01-20T07:11:03","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20107"},"modified":"2026-06-13T12:51:09","modified_gmt":"2026-06-13T10:51:09","slug":"grouting-technique","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/grouting-technique","title":{"rendered":"Grouting technique"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Grouting technique comprises underpouring, casting, and pressure grouting of voids, joints, and boreholes using mineral or reactive systems. The objectives are bonded, load\u2011transferring bedding, the durable filling of voids, sealing against water and other media, and the anchoring of structural elements. In conjunction with <a href=\"https:\/\/www.darda.de\/en\/applications\/concrete-demolition-and-special-deconstruction\">concrete demolition and special deconstruction<\/a> and rock excavation, it provides a clean technical closure of interventions previously executed with concrete demolition shears, <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">hydraulic rock and concrete splitters<\/a>, or cutting and shearing tools. In this way, structural elements are stabilized after deconstruction, anchors are bonded in a load\u2011transferring manner, and boreholes are professionally closed. Properly planned grouting &#8211; from substrate preparation to verification &#8211; ensures structural performance, tightness, and long\u2011term durability in demanding site conditions.<\/p>\n<h2>Definition: What is meant by grouting technique?<\/h2>\n<p>Grouting technique refers to the totality of methods for placing <strong>grout mortars<\/strong>, injection resins, and injection systems into cracks, joints, drill holes, and beneath bearing surfaces. Technically, a distinction is made between <em>undergrouting<\/em> (e.g., under machine foundations), <em>anchor grouting<\/em> (e.g., for rock and concrete anchors), <em>void filling<\/em> (e.g., after drilling and splitting operations), and <em>sealing injection<\/em> (e.g., against water ingress). Key requirements include flowability, low shrinkage tendency, adequate compressive strength, good bond, and an E\u2011modulus suited to the intended use. In practice, the system choice is guided by substrate condition, moisture, structural load case, and required service life.<\/p>\n<ul>\n<li><strong>Flow and placement behavior:<\/strong> consistent flow under gravity or pump pressure without segregation or bleeding.<\/li>\n<li><strong>Shrinkage and stability:<\/strong> low shrinkage or slightly expansive behavior to ensure tight, void\u2011free bedding.<\/li>\n<li><strong>Mechanical performance:<\/strong> compressive strength, bond strength, and E\u2011modulus harmonized with the component.<\/li>\n<li><strong>Durability:<\/strong> resistance to water, frost, chemicals, and cyclic loading under site\u2011specific exposure.<\/li>\n<\/ul>\n<h2>Materials and systems at a glance<\/h2>\n<p>The selection of the system is guided by loads, environmental conditions, and application method. In the deconstruction and rock context the following groups have become established:<\/p>\n<h3>Cement\u2011based grout mortars<\/h3>\n<p>Used as low\u2011shrinkage or expansive systems with a graded particle\u2011size distribution. Typical are high compressive strengths, good flow values, and robust placement even in larger cross\u2011sections. They are suitable for undergrouting of foundation slabs, filling split and drill holes, and for anchor grouting in concrete and rock. Well\u2011graded, anti\u2011bleed formulations reduce settlement and help achieve a <em>void\u2011free<\/em> contact joint.<\/p>\n<ul>\n<li><strong>Advantages:<\/strong> dimensionally stable, compatible with mineral substrates, and cost\u2011efficient for medium to large volumes.<\/li>\n<li><strong>Notes:<\/strong> observe minimum layer thickness, grout head, and curing to control early\u2011age thermal and moisture effects.<\/li>\n<\/ul>\n<h3>Microfine and ultrafine cement<\/h3>\n<p>For injections into fine cracks and rock pores, for example in tunnel construction for consolidation or to reduce water inflows. The small particle size enables penetration into capillary structures; stability and filtration behavior must be considered. Suspension design (water\u2011to\u2011binder ratio, stabilizers) and filtrate control are decisive for permeation grouting in low\u2011permeability media.<\/p>\n<ul>\n<li><strong>Typical uses:<\/strong> pre\u2011injection ahead of excavation faces, sealing of water\u2011bearing joints, and consolidation of friable zones.<\/li>\n<li><strong>Execution tip:<\/strong> adjust viscosity and pressure stepwise to avoid hydro\u2011fracturing and uncontrolled take\u2011up.<\/li>\n<\/ul>\n<h3>Reactive resins (epoxy, polyurethane)<\/h3>\n<p>Epoxy resins provide very high bond (pull\u2011off) and compressive strengths as well as low creep; they are used for highly loaded undergrouting, anchors in dynamically loaded areas, or for thin bearing joints. Polyurethanes are primarily used for sealing injections, especially in the presence of water ingress. Exothermy, temperature control, and emissions must be carefully managed. Polyurethanes can be formulated hydrophilic or hydrophobic and may foam to displace water; epoxies are typically chosen for structural injection and load transfer where rigidity and adhesion are critical.<\/p>\n<ul>\n<li><strong>Selection criteria:<\/strong> moisture at the interface, required rigidity vs. flexibility, temperature window, and permissible VOC\/emissions.<\/li>\n<li><strong>Execution note:<\/strong> maintain mixing ratios precisely and monitor pot life to avoid gelation in hoses and packers.<\/li>\n<\/ul>\n<h3>Thixotropic and vertically stable systems<\/h3>\n<p>For overhead or vertical applications, such as grouting core drill holes in walls or slabs after using concrete demolition shears and cutting methods. Here, thixotropic additives prevent run\u2011off while still providing sufficient working time. Sag resistance and non\u2011drip behavior improve edge definition and minimize rework on visible surfaces.<\/p>\n<h2>Design and planning in the deconstruction context<\/h2>\n<p>In projects involving concrete demolition and special demolition, proper planning of the grouting technique governs load behavior, tightness, and durability. Load paths, contact surfaces, and temperature histories must be defined in advance. Clear acceptance criteria, test sections, and an execution plan reduce rework and ensure reproducible outcomes.<\/p>\n<ul>\n<li><strong>Planning deliverables:<\/strong> method statement, sequencing with demolition works, packer layout and ports, pressure limits, and acceptance tests.<\/li>\n<li><strong>Interfaces:<\/strong> coordination with reinforcement detailing, corrosion protection, and temporary works stability.<\/li>\n<\/ul>\n<h3>Undergrouting of bearings and equipment<\/h3>\n<p>When undergrouting machine plates, rails, and pedestals &#8211; such as for <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">mobile hydraulic power units<\/a> that are operated temporarily or permanently on foundations &#8211; a flowable, low\u2011shrinkage grout mortar is selected. Important parameters are the E\u2011modulus, compressive strength, and the ability to fill the bearing area without voids.<\/p>\n<ul>\n<li><strong>Execution details:<\/strong> ensure a continuous pour from one side with venting, maintain a grout head, and avoid air entrapment beneath plates.<\/li>\n<li><strong>Dimensional checks:<\/strong> respect minimum and maximum layer thickness, shim removal timing, and flatness tolerances of contact faces.<\/li>\n<\/ul>\n<h3>Anchor grouting in concrete and rock<\/h3>\n<p>After removal with concrete demolition shears or splitting with hydraulic wedge splitters for stone and concrete, temporary or permanent anchors are often installed. The grout must reliably transfer loads, make use of borehole roughness, and respect edge distance. In wet boreholes, water\u2011tolerant systems must be provided. Cleaning quality of the hole (blow\u2011brush\u2011blow or flushing), embedment length, and confinement determine bond performance and slip behavior.<\/p>\n<ul>\n<li><strong>Design checks:<\/strong> bond and steel failure modes, minimum cover and spacing, and permissible installation in water\u2011filled holes.<\/li>\n<li><strong>Quality control:<\/strong> pull\u2011out testing on sample anchors with documented curing time and temperature history.<\/li>\n<\/ul>\n<h2>Process chain: preparation, placement, curing<\/h2>\n<p>Reproducible quality arises from a structured approach from substrate preparation through to documentation.<\/p>\n<ol>\n<li>Prepare the substrate: expose concrete, remove loose material, clean bonding surfaces, pre\u2011wet mineral systems (saturated surface\u2011dry). Ensure compatibility with existing coatings or inhibitors.<\/li>\n<li>Set formwork and dams: tight and stable; plan vent paths and pour openings; provide a gradient for material flow. Seal leakage paths and protect adjacent components.<\/li>\n<li>Mixing: adhere precisely to water addition, observe mixing time, ensure freedom from lumps and control temperature; for resins, keep component ratio exact. Avoid entrained air by suitable mixer geometry.<\/li>\n<li>Placement: place continuously from one side, promote venting, avoid material changes; respect the placement time (pot life). Monitor pressure and flow to prevent washout and segregation.<\/li>\n<li>Curing: protect early against drying, frost, or heat; control exothermic reactions; rework edge areas. Maintain moisture for cementitious systems as specified.<\/li>\n<li>Control: record flow spread, air temperature, component temperature, compressive strength of fresh mortar\/hardened concrete, and, where applicable, pull\u2011off tests or an anchor pull\u2011out test. Trace batch numbers and mixing ratios.<\/li>\n<li>Documentation and acceptance: compile measurements, photographs, and test results in a log to evidence conformity with the execution plan.<\/li>\n<\/ol>\n<h2>Grouting technique in conjunction with stone and concrete splitting devices<\/h2>\n<p>Stone and concrete splitting devices create defined splits via wedge\u2011based stresses in predrilled holes. The resulting voids, split joints, and bore channels are often grouted for structural or building\u2011physics reasons, following the wedge principle. Venting and sequential filling avoid trapping water or air in branched cavities created by splitting.<\/p>\n<h3>Borehole and split\u2011joint grouting<\/h3>\n<p>After controlled splitting in natural stone extraction or in concrete demolition, boreholes can be filled with low\u2011shrinkage mortars to homogenize surfaces, block water paths, or set anchors with a bonded load transfer. In water\u2011bearing areas, consolidating injections with microfine cement or water\u2011reactive systems are appropriate. Filter stability, bleeding behavior, and the risk of washout must be assessed; for large diameters, staged fills and re\u2011compaction improve homogeneity.<\/p>\n<h3>Crack injection for stabilization<\/h3>\n<p>For secondary cracks resulting from load redistribution, injections with low\u2011viscosity systems can restore integrity. Decisive factors include suitable packer arrangement, controlled pressure, and monitoring of material intake. Stop criteria may be a defined pressure rise, material return at adjacent packers, or reaching the calculated intake volume.<\/p>\n<h2>Applications with concrete demolition shears, hydraulic demolition shears and multi cutters<\/h2>\n<p>Selective dismantling with concrete demolition shears exposes reinforcement, produces edge breakouts, and creates local voids. Proper closure includes grouting of:<\/p>\n<ul>\n<li>Core drill holes and penetrations after gutting works, including the annular space around sleeves and lines.<\/li>\n<li>Undergrouting beneath newly installed steel plates or brackets after removal.<\/li>\n<li>Reinforcement anchors for temporary shoring or permanent attachments, with their boreholes pressure\u2011grouted.<\/li>\n<li>Reprofiling of edges and restoration of bearing faces to reinstate load paths and cover.<\/li>\n<li>Sealing of saw\u2011cut terminations where watertightness or fire integrity must be maintained.<\/li>\n<\/ul>\n<p>In steel cutting operations (e.g., with a steel shear or a cutting torch), supports and brackets often need to be re\u2011grouted to transfer loads safely into existing structures. System selection is based on vibrations, corrosion risks, and ambient humidity, with attention to differential stiffness and thermal compatibility at steel\u2011concrete interfaces.<\/p>\n<h2>Rock excavation and tunnel construction: injection, consolidation, sealing<\/h2>\n<p>In rock excavation and tunnel construction, grouting technique supports both preparatory and concluding steps: prior to splitting, injections calm water\u2011bearing zones; after intervention, pressure grouting consolidates loose edge areas. Anchors (rock bolts) are grouted in boreholes, contact grouting behind linings closes voids, and curtain injections reduce inflows. Parameters such as injection pressure, viscosity, and gel time must be matched to the rock mass. Stage grouting and verification borings help optimize intake, limit overbreak, and confirm the achieved permeability reduction.<\/p>\n<h2>Gutting and cutting: properly closing penetrations<\/h2>\n<p>Gutting creates openings for utilities, cable ducts, and ventilation. After cutting, annular spaces, casing pipes, and core drill holes are grouted with vertically stable systems to satisfy fire protection, building acoustics, and tightness. Thixotropic mortars prevent run\u2011off on vertical surfaces; for dynamic loads or high temperatures, epoxy resins can be suitable. Detailing of collars, sleeves, and terminations is key to smoke tightness and long\u2011term impermeability under service conditions.<\/p>\n<h2>Quality assurance and test methods<\/h2>\n<p>For a durable bond, testing and documentation steps are essential. Common practices include flow spread measurements, density determination, temperature tracking, compressive strength testing on specimens, as well as pull\u2011off or an anchor pull\u2011out test for anchors. Boundary conditions such as component temperature, humidity, and wind are recorded. This information allows a traceable assessment of installation quality in the context of concrete demolition and special demolition. For traceability, record batch IDs, water addition or mix ratios, equipment settings, and curing measures; define acceptance thresholds in advance.<\/p>\n<h2>Occupational safety and environmental aspects<\/h2>\n<p>When handling dusting mortars and reactive resins, personal protective equipment, dust suppression, and proper ventilation are required. Resin systems require controlled skin and eye protection and measures against uncontrolled exothermy. Washout into soil and water bodies must be avoided; residual quantities are collected separately and transferred to a certified disposal company. The information in the technical data sheets must be observed; notes are general in nature and do not replace project\u2011specific planning. Consider exposure to respirable crystalline silica during mixing and drilling, and manage isocyanate exposure for specific polyurethane systems with suitable training and controls.<\/p>\n<h2>Typical failure patterns and practical countermeasures<\/h2>\n<p>Frequent causes of deficiencies include excessive water additions, insufficiently cleaned bonding surfaces, lack of curing, material changes during placement, or unconsidered temperature gradients. Countermeasures include precise water dosing, the saturated surface\u2011dry concept for mineral systems, continuous placement from one side, venting of the formwork, and effective moisture protection and temperature control during the first hours. Further pitfalls are washout in flowing water, filter clogging in fine media, and uncontrolled exothermy in resins &#8211; all of which call for adapted viscosity, staged pressure, and temperature management.<\/p>\n<h2>Terminology distinctions within grouting technique<\/h2>\n<p>Undergrouting denotes the flowable, void\u2011free creation of a bonded contact joint, for example beneath machines and bearings. Pressure grouting or injection describes the introduction of low\u2011viscosity systems into cracks, pores, and boreholes under pressure or by gravity. Void filling covers the casting of larger volumes. In many projects &#8211; especially when using concrete demolition shears as well as stone and concrete splitting devices &#8211; these procedures occur in combination: splitting, dismantling, anchoring, and, finally, undergrouting or injection form a continuous process chain for safe, tight, and durable structures.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Grouting technique comprises underpouring, casting, and pressure grouting of voids, joints, and boreholes using mineral or reactive systems. The objectives are bonded, load\u2011transferring bedding, the durable filling of voids, sealing against water and other media, and the anchoring of structural elements. In conjunction with concrete demolition and special deconstruction and <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/grouting-technique\">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":"","_members_access_role":[],"_members_access_error":""},"class_list":["post-20107","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Grouting Technique for Concrete &amp; Rock Structures<\/title>\n<meta name=\"description\" content=\"Guide to grouting technique for concrete &amp; rock - methods, materials \u2713 undergrouting, anchors, sealing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.darda.de\/en\/knowledge\/grouting-technique\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Grouting Technique for Concrete &amp; Rock Structures\" \/>\n<meta property=\"og:description\" content=\"Guide to grouting technique for concrete &amp; rock - 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