Calcium Aluminate Cements are high-performance specialty binders and mineral reagents with various useful properties, and Bisley supplies CALUCEM’s range of fused calcium Aluminate cements (CACs). CACs can be found in concrete mix designs and repair mortars used for pipe lining applications as well as sewer rehabilitation projects.<\/p>\n
Though their chemical make-up differs considerably from that of Portland cements, CAC concretes demonstrate remarkable high performance in certain applications such as resistance to acid attack and abrasion resistance.<\/p>\n
Calcium Aluminate Cement’s primary binder, calcium Aluminate (CA), offers much higher resistance to acid than Portland cement. Although all concretes degrade in acid environments, CA offers exceptional resistance against both hydrochloric and sulfuric acids due to its reaction with water, and has exceptional resistance against sulfates making it suitable for use in concrete repair mortars exposed to such chemicals.<\/p>\n
CA is versatile enough to be used as either a standalone binder, in binary or ternary systems with OPC, fly ash and\/or gypsum as part of an OPC\/F\/A mix, or mixed in binary\/ternary combinations with them to produce rapid hardening, early strength development and biogenic corrosion resistance. Bisley offers grades of CAC that range from 40-80% Al2O3 for use in self-levelling grouts with high early strength grouts as well as self-levelling\/high strength grouts used ductile iron pipe lining, sewer rehabilitation as standalone blends blended with Portland cement mixes.<\/p>\n
CAC systems with binary systems offer quick setting times, making them ideal for repair work in small areas that need rapid strength development. Compatible with most OPC admixtures, CAC should only be used with precision when using ternary CAC systems which may cause early strength aging resulting in mottled surface appearance due to early strength aging – recipe design and testing should only be conducted before use.<\/p>\n
Visit our catalog for an extensive selection of CAC options. All the products in our range contain at least 40% alumina for optimal use in concrete and refractory applications, boasting low viscosity for effortless mixing and pouring. High resistance to sulfates, biogenic corrosion and abrasion make them ideal for concretes and repair mortars in harsh environments, while they also boast excellent chemical and heat resistance. A product’s service temperature is determined by its alumina content; higher percentages can withstand temperatures as high as 1900degC, making this cement ideal for applications such as refractory bricks, furnace lining and coating smoke stacks. CAC cement’s unique properties also mean it can help shorten project durations while providing more environmentally sustainable solutions than its alternatives.<\/p>\n
Calcium aluminate cements have long been utilized for applications requiring high resistance to corrosion, abrasion and heat as well as rapid setting times. They can be found used as specialty binders in concrete and mortar applications within specific construction environments; such as lining steel or ductile iron pipes with these cements to increase resistance against aggressive substances like H2S produced microbially or as part of cementitious mixes for hydraulic dams.<\/p>\n
Calcium aluminate cements possess unique properties due to their chemical and microstructural makeup. They contain a significant proportion of anhydrous aluminate which exhibits superior durability over Portland cements due to its resistance against degradation across a broad spectrum of temperatures and chemicals environments.<\/p>\n
Anhydrous Aluminate resists acid attack even in the presence of sulfates which degrade Portland cement and other concrete, by bonding tightly to silica during its hydration process and keeping water from penetrating the concrete matrix. This gives calcium Aluminate cements exceptional durability when exposed to harsh environments where corrosion and abrasion are prevalent issues.<\/p>\n
Calcium aluminate cements have proven extremely useful in road rehabilitation and repair applications to increase durability of existing highways, especially where road usage increases rapidly. Their quick application in dry weather with minimal traffic disruption or delays has proved especially advantageous in these regions.<\/p>\n
Calcium aluminate cements’ rapid setting time allows them to produce fast-hardening concretes and repair mortars, which have proven particularly valuable when building bridge decks that must withstand heavy traffic loads as well as trucks and other vehicles.<\/p>\n
Calcium aluminate cements are widely utilized as refractories due to their excellent resistance against very high temperatures and abrasion, making them an excellent material choice for coating the insides of steel furnaces and blast furnace linings.<\/p>\n
Calcium Aluminate Cements (CAC) offer excellent thermal, wear and acid resistance as well as early strength gains. CAC can also serve as an excellent binder in applications where corrosion resistance, heat or abrasion resistance and rapid strengthening are important considerations; such as use as an adhesive layer. These characteristics make calcium Aluminate cements popular choices when rapid strengthening is essential.<\/p>\n
Contrary to Portland cement, calcium aluminate cement concretes produced using CAC have a superior resistance against chemical attack and erosion caused by acidic solutions and hydrogen sulfide gas in sewer networks (microbial or bacteriogenic corrosion). This protects them from being broken apart into smaller fragments that would easily disperse under normal weather conditions or under heavy loads from heavy equipment use (cement-coated steel reinforcement in particular is often susceptible).<\/p>\n
CAC can significantly help to inhibit steel reinforcement corrosion, whether by increasing chloride binding capacity or by creating a protective alumina gel which slows corrosion down. Studies have also demonstrated that when mixed together OPC and CAC the inhibition effect exceeds even that of using either alone.<\/p>\n
CAC and OPC combinations in concrete have been discovered to exert a high inhibitive effect on steel’s polarization resistance, due to increased chloride binding capacity which reduces mobility of chlorine ions within pore solutions and thus limit their potential corrosion corrosive impact on steel.<\/p>\n
CAC hydration is generally slower than OPC, limiting the release of alkalis into the pore fluid and slowing its development into an aluminate gel layer. This reduces its pH value as well as retarding formation.<\/p>\n
CAC boasts an exceptional 24-hour final strength that makes it suitable for quick-hardening applications such as self-levelling and high strength grouts, self-levelling applications, pipe linings and refractory concretes. Bisley offers CACs (40-80% Al2O3) that can be used both standalone binders or integrated into binary or ternary systems for these purposes.<\/p>\n
Calcium Aluminate Cements and Concretes have an innovative microstructure which renders them highly resistant to chemical attack, while also being durable enough for abrasion resistance. Their chemical makeup and microstructure account for these unique properties that make CACs useful in specific applications like protecting sewage pipes against sulfuric acid production by bacteria or in hydraulic dam linings against wear-and-tear.<\/p>\n
CACs are often combined with Portland cement to produce chemical-resistant concretes. Their combination allows for faster hydration rates, enabling rapid rise to strength and controlled expansion during construction projects; for instance, leveling screeds and grout mortar should reach their final strength within 24 hours after mixing.<\/p>\n
All hydraulic binders go through a series of hydration reactions which depend on ambient temperature and moisture content, as well as when exposed to water at elevated humidity levels and elevated temperatures. Hydration reactions tend to be most successful when exposed directly to moisture at these conditions; CACs in particular appear less affected by moisture than OPCs during this process.<\/p>\n
Calcium Aluminate cements form a matrix during hydration which is impregnated with a gel-like layer of hydrous aluminate that acts to bind metal ions like chloride and iron, providing increased chemical resistance against corrosion attacks. Furthermore, this gel-like layer prevents these metal ions from reacting with silica in the matrix and creating expansive Ettringite corrosion within ductile iron pipes – another common cause of corrosion.<\/p>\n
An increase in pH value on the surface of CAC mortar or concrete is another key element to its enhanced biogenic corrosion resistance. When subjected to an accelerated MIC test that mimics natural conditions associated with sewer infrastructure, cell numbers in both OPC 45 mortar samples and CAC 45 samples fall to similar levels; however, with CAC samples stabilising at around 2, significantly decreasing sulfuric acid production by bacteria.<\/p>\n
Bisley distributes Istra brand Calcium Aluminate Cements (CAC) manufactured by CALUCEM for use in construction products like self-levelling and high strength grouts, pipe lining and sewer rehabilitation mortars and refractory concretes. CACs feature rapid hardening rates, strong early strength gains and exceptional chemical resistance either alone or as part of binary\/ternary systems.<\/p>","protected":false},"excerpt":{"rendered":"
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