{"id":19309,"date":"2025-09-03T12:02:47","date_gmt":"2025-09-03T10:02:47","guid":{"rendered":"https:\/\/www.darda.de\/calcium-silicate-brick"},"modified":"2026-04-18T12:08:03","modified_gmt":"2026-04-18T10:08:03","slug":"calcium-silicate-brick","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/calcium-silicate-brick","title":{"rendered":"Calcium silicate brick"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Calcium silicate brick is a widely used masonry building material for load-bearing and non-load-bearing walls in building construction. It stands for high dimensional stability, good sound insulation and non-combustibility. In existing buildings it is found from single-family houses to schools, from hospitals to administrative buildings. For planning, processing and deconstruction, it is crucial how the brittle, compression-resistant material responds to cutting, splitting and crushing. Depending on the objective, quiet, low-vibration methods come into play, such as <em>static splitting<\/em> using <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">hydraulic rock and concrete splitters<\/a> or controlled removal with concrete shears. The following sections consolidate fundamental knowledge and proven procedures &#8211; objective, safety-conscious, and focused on demolition, strip-out and specialized deconstruction.<\/p>\n<h2>Definition: What is meant by calcium silicate brick?<\/h2>\n<p>Calcium silicate brick (also silicate brick, sand-lime brick, abbreviated KS) is a man-made masonry unit produced from quartz sand, lime and water. The mixture is formed under pressure and steam-cured in an autoclave. This creates a solid, dimensionally accurate structure with high compressive strength. Calcium silicate brick is non-combustible, exhibits a relatively high bulk density and thus provides good sound insulation. It is used as standard-size units, blocks, plane elements or large-format panels. Thin-bed joints are typical for plane-element masonry, as are load-bearing and bracing wall panels. The material is brittle and preferentially fractures along targeted stress lines &#8211; an aspect that can be exploited when choosing separation and deconstruction methods. In practice, standardized formats and tolerances support precise laying and subsequent separation with predictable crack paths.<\/p>\n<h2>Properties, formats and manufacturing of calcium silicate brick<\/h2>\n<p>Calcium silicate brick is produced from natural sand and hydrated lime, which are mixed with water, pressed, and cured under saturated steam. Under the microscope, dense matrices with calcium silicate hydrates are visible. This structure explains the <strong>high compressive strength<\/strong> but low tensile and flexural strength. Bulk density classes and strength classes cover a broad spectrum &#8211; from lightweight units for partition walls to load-bearing elements for multi-storey buildings. Thermal conductivity is higher than in many lightweight materials, fire performance is excellent, and sound insulation is very good due to mass. Water can be absorbed capillarily; from a building physics perspective, plinth detailing and moisture protection must therefore be planned carefully. Where exposure to freeze-thaw cycling is expected, detailing and drainage should limit prolonged saturation.<\/p>\n<h3>Formats and microstructure<\/h3>\n<ul>\n<li>Standard and block formats for conventional masonry<\/li>\n<li>Plane elements for fast installation with thin-bed mortar<\/li>\n<li>Solid and perforated units, depending on the desired bulk density and handling<\/li>\n<li>Factory-made, dimensionally accurate elements facilitate precise separation<\/li>\n<li>Optional grooves, recesses or handling aids can simplify installation and guided splitting<\/li>\n<\/ul>\n<h3>Material classes and performance metrics<\/h3>\n<ul>\n<li><strong>Strength classes<\/strong>: coordinated with regional standards; suitable variants for non-load-bearing to highly loaded walls<\/li>\n<li><strong>Bulk density<\/strong>: higher mass than many lightweight units, promoting <em>sound insulation<\/em> and improving impact resistance<\/li>\n<li><strong>Thermal behavior<\/strong>: moderate thermal conductivity; thermal bridges require careful detailing at connections<\/li>\n<li><strong>Moisture behavior<\/strong>: capillary-active; design plinths, splash zones and damp-proof courses with particular care<\/li>\n<li><strong>Fire performance<\/strong>: non-combustible with stable load-bearing behavior under fire exposure<\/li>\n<\/ul>\n<h2>Behavior during processing, separation and deconstruction of calcium silicate brick masonry<\/h2>\n<p>KS masonry reacts in a brittle manner. It fractures along targeted stress peaks and existing weaknesses (joints, openings, service chases). For controlled interventions, <strong>low-vibration<\/strong> methods have proven effective: static splitting using stone and concrete splitters, sectional <em>nibbling<\/em> of wall edges with concrete shears, and pre-drilling and sawing where precise cut edges are required. The goal is to respect load paths, prevent unintended crack propagation, and protect adjacent components. Composite zones (lintels, ring beams, anchors) and embedded conduits should be identified in advance to avoid uncontrolled breakout.<\/p>\n<h3>Tool selection based on objective and boundary conditions<\/h3>\n<ul>\n<li><strong>Stone and concrete splitters<\/strong>: Introduction of defined tensile stresses via wedges\/splitting cylinders; ideal for quiet, low-vibration opening and partial deconstruction of KS walls. Particularly effective along drill lines and at joints.<\/li>\n<li><strong>Concrete shears<\/strong>: Nibbling of masonry, edges and projections; suitable for controlled removal, especially in mixed constructions with ring beams, lintels or concrete components. Enables section-by-section reduction of cross-section.<\/li>\n<li><a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">Hydraulic power packs<\/a>: Power supply for handheld or portable tools where access is tight, in interior spaces and sensitive areas. Selection depends on required pressure and flow.<\/li>\n<li>Combination shears and multi-cutters: For mixed materials, e.g., when dismantling built-in components, conduits, or light steel sections adjacent to KS. Reduces tool changes on site.<\/li>\n<li><a href=\"https:\/\/www.darda.de\/en\/product-overview\/steel-shears\">Steel shears<\/a>: Cutting reinforcement in adjacent concrete components or steel structural parts that brace KS walls. Prevents unintended load transfer during masonry separation.<\/li>\n<li>Tank cutters: Specifically for sheet metal and hollow bodies; in the KS context mainly relevant for adjacent special tasks, not for the masonry itself.<\/li>\n<li><strong>Diamond saws and core drills<\/strong>: For clean arrises and tolerance-critical interfaces; combine with extraction or wet methods to control dust.<\/li>\n<\/ul>\n<h3>Selective demolition in existing buildings<\/h3>\n<p>For door openings, wall breakthroughs or partial removals, a clear separation joint is crucial. Typical practice: pre-score or pre-drill along the planned cut line, set splitting cylinders to induce <em>directed crack formation<\/em>, then remove remaining webs with the concrete shear. This keeps vibrations low and protects adjacent surfaces. For KS with ring-shaped concrete components (ring beams, reinforced concrete lintels), the concrete portions can be separated with the concrete shear.<\/p>\n<ul>\n<li>Sequence from free edges toward supported areas; relieve constraints early to limit crack diversion.<\/li>\n<li>Maintain adequate edge distances when drilling to avoid spalling; stagger holes where required.<\/li>\n<li>Protect adjacent finishes mechanically (boards, mats) in addition to dust control.<\/li>\n<\/ul>\n<h3>Vibrations and building protection<\/h3>\n<p>Calcium silicate brick transmits vibrations in the form of fine crack formation. <strong>Static splitting<\/strong> significantly reduces the risk compared to impact or hammer use. In sensitive zones (buildings with high-value finishes, laboratories, clinics) low-vibration methods are standard. Pre-condition surveys of finishes and crack gauges or spot measurements can be used to document and verify compliance with project-specific thresholds.<\/p>\n<h2>Planning: Consider structure, load paths and temporary states<\/h2>\n<p>Before intervening, clarify load transfer, intermediate states and the function of wall panels. Load-bearing KS walls can provide bracing; openings change stiffness. Temporary shoring and the sequence of work steps must be defined accordingly. In moisture-exposed areas, assess material condition and masonry bonds, as saturated units fracture differently. Interfaces to slabs and columns, ring beams and lintels, as well as restraints by finishes or fixtures, should be mapped and considered in the cutting pattern.<\/p>\n<h3>Dust and noise reduction<\/h3>\n<ul>\n<li>Wet cutting or drilling where technically feasible<\/li>\n<li>Sectional splitting instead of continuous percussive work<\/li>\n<li>Dust extraction at drilling points; clear openings promptly<\/li>\n<li>Covers and partitions in interior spaces<\/li>\n<li>Use suitable extraction units and filters; avoid dry sweeping<\/li>\n<li>Plan work windows to align with permissible noise periods<\/li>\n<\/ul>\n<h3>Safety and occupational safety<\/h3>\n<p>Hydraulic tools must be operated as intended. For deconstruction work, protective measures apply against crushing, hydraulic leaks, flying fragments and dust. Manufacturer instructions and generally accepted technical rules should be observed.<\/p>\n<ul>\n<li>PPE: eye and face protection, cut-resistant gloves, hearing protection, safety footwear and dust masks appropriate to exposure<\/li>\n<li>Hydraulics: check hoses, couplings and pressure settings; secure hoses against tripping and damage<\/li>\n<li>Work area: establish exclusion zones; ensure secure footing and safe component support before section release<\/li>\n<li>Dust: prefer on-tool extraction and water suppression; dispose of collected dust appropriately<\/li>\n<\/ul>\n<h2>Cutting, drilling and opening: proven procedures<\/h2>\n<p>Precise openings in KS often result from a combination of pre-drilling, static splitting and localized removal. Saw cuts deliver clean edges; where sawing is not possible, splitting cylinders assume crack control. Residual webs and cantilevering areas can be selectively removed with the concrete shear. Hydraulic power packs supply the tools even in areas without a heavy-duty electrical connection. Edge distances, drill spacing and drilling angle should be coordinated to avoid unintended breakout; avoid overcuts at corners by using core holes or intersecting cut strategies.<\/p>\n<h3>Typical work steps<\/h3>\n<ol>\n<li>Mark out and assess structurally; install required temporary shoring. Document the initial condition of adjacent surfaces.<\/li>\n<li>Pre-drill along the cut line (spacing and diameter matched to the splitting tool).<\/li>\n<li>Apply stone and concrete splitters to generate a controlled fracture joint.<\/li>\n<li>Remove webs and edges section by section with concrete shears.<\/li>\n<li>Secure, extract and separate materials by type.<\/li>\n<li>Dress edges; if necessary, level the masonry and prepare.<\/li>\n<\/ol>\n<h2>Recycling and disposal of calcium silicate brick<\/h2>\n<p>Source-pure KS material can be processed into <em>recycled aggregates<\/em>, for example for unbound base layers or as aggregate in recycled construction material mixes. Mortar adhesions and impurities (gypsum, wood, plastics, metals) should be minimized. Separate collection of KS, concrete and brick increases the material recycling rate. Legal requirements for waste classification and the use of recycled materials must be observed. Depending on the jurisdiction, suitability and environmental compatibility can require testing (e.g., fines content, contaminants, leaching behavior).<\/p>\n<h3>Reuse<\/h3>\n<p>Undamaged units can be reused in secondary applications after cleaning, provided load-bearing capacity and serviceability are ensured. Visual quality depends on the removal method; <strong>gentle, low-vibration methods<\/strong> promote preservation. Dimensional accuracy, absence of cracks and moisture content should be verified before reuse, especially where tight tolerances or exposed surfaces are intended.<\/p>\n<h2>Calcium silicate brick compared with concrete and natural stone in demolition work<\/h2>\n<p>Compared to concrete, calcium silicate brick has high compressive strength but low tensile strength. This makes it susceptible to separation cracks through static splitting. Concrete shears are used especially where KS components are coupled with concrete or steel parts (lintels, ring beams, bearing zones). Natural stone exhibits anisotropic fracture surfaces depending on the rock type; KS, by contrast, fractures predominantly along joints and drill lines, making crack control more predictable. Reinforcement typically found in concrete is absent in KS units themselves, but composite elements and anchors can alter the fracture pattern and tool choice.<\/p>\n<h2>Typical damage patterns and their significance for deconstruction<\/h2>\n<p>Hairline cracks, settlement cracks, moisture-related symptoms or frost spalling influence the fracture path. In pre-damaged zones the material may break out irregularly. The placement of splitting points and the sequence of work steps must be adapted accordingly. <em>Preliminary trials<\/em> in non-critical areas help assess the masonry\u2019s response. Efflorescence or salt-laden zones can indicate prior moisture ingress and potential weakness or increased brittleness.<\/p>\n<h2>Areas of application and practical uses<\/h2>\n<p>In <strong>concrete demolition and specialized deconstruction<\/strong>, KS walls are often processed adjacent to reinforced concrete components. Concrete shears separate ring beams and concrete lintels, while stone and concrete splitters open KS surfaces with low vibration. In <strong>strip-out and cutting<\/strong>, quiet handheld tools are advantageous, for example in occupied buildings. For <strong>special tasks<\/strong> with limited access or restrictions on noise and dust, compact hydraulic systems are a practical solution. For <strong>rock demolition and tunnel construction<\/strong> as well as <strong>natural stone extraction<\/strong>, KS is not the target material; the splitting and shear principles used there show parallels in controlled crack guidance and can be transferred to KS.<\/p>\n<h2>Selection of suitable equipment and parameters<\/h2>\n<p>The choice of equipment category depends on wall thickness, bonding, embedded components and accessibility. For splitting, drill-hole diameter, cylinder stroke and splitting force must be coordinated. For concrete shears, jaw opening, blade geometry and force curve are decisive, especially at transitions to concrete. For diamond tools, blade specification and cooling method must reflect KS density, joint layout and required edge quality.<\/p>\n<h3>Notes on sizing<\/h3>\n<ul>\n<li>Match drill-hole diameter to the splitting wedge; select uniform hole spacing.<\/li>\n<li>Use smaller hole spacing for thin walls to control notch stresses.<\/li>\n<li>Identify KS\/concrete transitions in advance; define the removal sequence.<\/li>\n<li>Select hydraulic power packs according to the required flow rate and pressure.<\/li>\n<li>Maintain minimum edge distances for drill holes and cuts to prevent spalling at corners.<\/li>\n<li>Apply staged splitting with intermediate relief where wall panels show restraint or high pre-stress.<\/li>\n<\/ul>\n<h2>Quality assurance and documentation<\/h2>\n<p>For sensitive projects, vibrations, crack patterns and dust generation should be documented. Measurement points before and after the interventions provide comparison values. A clear sequence plan with inspection and approval points increases execution safety. Photo logs, material separation records and equipment settings (pressures, flow rates) support traceability and repeatability.<\/p>\n<h2>Regulations and permits at a glance<\/h2>\n<p>For masonry work, demolition and occupational safety, the relevant technical rules and official requirements apply. These must be reviewed and complied with on a project-specific basis. The information in this contribution is general in nature and does not replace project-specific planning. Depending on the location, additional requirements may concern noise and dust limits, transport and disposal of mineral waste, and exposure control for respirable crystalline dust.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Calcium silicate brick is a widely used masonry building material for load-bearing and non-load-bearing walls in building construction. It stands for high dimensional stability, good sound insulation and non-combustibility. In existing buildings it is found from single-family houses to schools, from hospitals to administrative buildings. For planning, processing and deconstruction, <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/calcium-silicate-brick\">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-19309","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>Calcium Silicate Brick | Construction &amp; Demolition<\/title>\n<meta name=\"description\" content=\"Learn about calcium silicate brick \u2713 properties, uses &amp; low vibration demolition for precise openings.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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