When a reinforced concrete column, beam, or slab is damaged, the instinct is often to patch it with ordinary cement mortar or fresh concrete. On a congested, corroded, or hard-to-reach section, that rarely works. The mix will not flow into the tight gaps around the reinforcement, it cannot be vibrated properly, and as it dries it shrinks and pulls away from the parent concrete, leaving voids exactly where you needed strength. This is the problem micro-concrete repair was designed to solve.
Micro-concrete and repair mortars are the two workhorses of structural concrete repair. One is poured, one is trowelled, and knowing which to reach for saves time, material, and re-work. This guide explains the difference, walks through the Sika and Dr. Fixit options that Khandelwal Trading Co. stocks in Panchkula, and shows how to match the product to the repair. It is written for contractors and site engineers across the Tricity, though anyone rebuilding a damaged plinth, staircase, or column will find it useful.
Micro-concrete vs repair mortar: which one for your job
Both restore damaged concrete, but they suit different situations. The choice usually comes down to the depth of the repair, whether the surface is horizontal or vertical, and how congested the reinforcement is.
Reach for micro-concrete when
- The repair is deep, typically more than about 40 to 50 mm, or you are enlarging a section.
- The reinforcement is congested and a hand-applied mortar cannot be packed in properly.
- You can put up formwork and pour, letting a free-flowing material fill the void under its own weight.
- You are jacketing a column or beam to increase its load capacity.
Reach for a repair mortar when
- The repair is shallow to medium depth and can be built up by hand.
- The surface is vertical or overhead, where a thixotropic mortar stays put without slumping.
- You are patching spalled cover, honeycombing, or small localised defects.
- Setting up formwork would be impractical for the size of the job.
As a rule of thumb: if you can pour it, think micro-concrete; if you have to trowel it, think repair mortar.
Micro-concrete for deep repairs and jacketing
Micro-concrete is a factory-designed, pre-bagged powder that you mix with clean water on site to produce a pourable, non-shrink, self-compacting concrete. Because it flows into place and fills congested reinforcement without vibration, it is the go-to material for deep structural repairs and section enlargement.
Sikacrete-145
Sikacrete-145 is Sika’s high-performance micro-concrete for deep repairs to all types of concrete structures. It is shrinkage-compensated, free-flowing, and self-compacting, and it conforms to the EN 1504-3 repair standard. Typical uses include repairing damaged columns, beams, and slabs, jacketing members to add load capacity, and any localised deep repair where access is restricted. It is mixed with clean water, and for deeper lifts, graded aggregate is added on site as per the data sheet. Formwork is put up to contain the pour, and it can be placed by hand for small jobs or pumped over larger areas.
Sika also offers related grades for specific conditions, such as SikaRep Microcrete-4 for versatile horizontal and vertical work, and SikaRep Microcrete-3 UW, an anti-wash micro-concrete for wet or underwater repairs.
Dr. Fixit Micro Concrete
Dr. Fixit Micro Concrete is the Pidilite alternative we also stock: a ready-to-use, dual shrinkage-compensated dry powder that needs only clean water to produce a free-flowing, dimensionally stable micro-concrete. It is designed for the same job, restoring damaged reinforced sections and jacketing RCC columns, conforms to EN 1504-3 Class R4, contains no chloride-based additives, and can be poured or pumped into restricted, congested areas.
Note: Dr. Fixit also sells a product called Powercrete, but that is an acrylic-polymer waterproofing coating, not a micro-concrete, so do not confuse the two on site.
Repair mortars for hand-applied patching
Where the defect is shallower or on a vertical face, a trowel-applied repair mortar is faster and needs no formwork. Sika’s cementitious repair mortars cover the common cases:
- SikaTop-122 HS is a polymer-modified, one-component repair mortar for hand or machine application, a solid all-rounder for patching spalled and damaged concrete.
- Sika MonoTop-122 F is a dual shrinkage-compensated, fibre-reinforced, thixotropic mortar that holds well on vertical and overhead surfaces.
- Sika MonoTop-3400 Abraroc is a high-abrasion-resistant repair mortar for surfaces that take heavy wear, such as loading areas and industrial floors.
For repairs that need the highest strength or chemical resistance, Sika’s epoxy mortars step up. Sikadur-41 IN and Sikadur-43 HE are three-part thixotropic epoxy patching mortars used where a cementitious mortar simply is not tough enough, for example on machine bases, edges, and chemically exposed areas.
Do not skip the prep, the steel, or the bond
Even the best micro-concrete fails if the groundwork is wrong. A durable repair depends on three things that happen before the new material goes in.
- Surface preparation: cut back loose and weak concrete to a sound base, saw-cut the edges of the repair area to avoid feather-edging, and clean off dust, oil, and laitance. Bring the substrate to a saturated surface-dry condition before placing cementitious repair materials.
- Treat the reinforcement: if the steel is corroded, clean it and coat it with an anti-corrosion primer such as SikaTop Armatec-110 EpoCem, or the rust will simply push the new repair off again.
- Get the bond right: use the correct bonding coat so old and new act as one. Our guide to SBR bonding agents covers this in detail.
For the full picture of how these steps fit together across the whole repair system, see our pillar guide, concrete repair and surface strengthening with Sika.
Quick reference: which product for which repair
- Deep repair, column or beam jacketing, congested rebar: Sikacrete-145 or Dr. Fixit Micro Concrete.
- Wet or underwater deep repair: SikaRep Microcrete-3 UW.
- Shallow to medium patching, vertical and overhead: SikaTop-122 HS or Sika MonoTop-122 F.
- High-abrasion patch on a worn surface: Sika MonoTop-3400 Abraroc.
- Highest strength or chemical resistance: Sikadur-41 IN or Sikadur-43 HE epoxy mortar.
Not sure which grade suits your section and access? Send us the details through our get a quote page and we will help you specify it.
Buying micro-concrete and repair mortars in Panchkula
Khandelwal Trading Co. carries the Sika and Dr. Fixit repair ranges along with the bonding agents, primers, and curing products that go with them, so you can pick up everything a repair needs in one trip. Tricity contractors have long treated us as the “Google shop for the construction industry,” and for structural repair work that means the right grade for the right job, not just whatever is on the shelf. If a specific grade is not in stock, we can usually source it. Browse the wider range on our construction chemicals and adhesives page.
Whether you are a contractor doing column jacketing across a site or a homeowner fixing a single spalled beam, come in, call, or message us and we will help you get the specification and quantity right the first time.
Frequently asked questions
What is micro-concrete, and how is it different from normal concrete?
Micro-concrete is a pre-bagged, factory-designed repair material that you mix with clean water on site. Unlike ordinary concrete, it is free-flowing and non-shrink, so it fills congested reinforcement and deep voids under its own weight without vibration, and it does not shrink away from the parent concrete as it sets.
How deep a repair can micro-concrete handle?
It is made for deep repairs and section enlargement. For lifts beyond around 100 mm, graded aggregate is usually added on site as per the product data sheet. For shallower repairs, a trowel-applied repair mortar is often the better and faster choice.
Can I use a repair mortar on a vertical wall or overhead?
Yes. Thixotropic repair mortars such as Sika MonoTop-122 F are designed to stay in place on vertical and overhead surfaces without slumping, which is exactly where a pourable micro-concrete would not work.
Do I need a bonding agent with micro-concrete and repair mortars?
Surface preparation and bonding are critical. The substrate must be sound, clean, and brought to a saturated surface-dry condition, corroded steel must be primed, and a suitable bond coat used. Skipping these steps is the most common cause of repair failure.
Is Dr. Fixit Powercrete a micro-concrete?
No. Dr. Fixit Powercrete is an acrylic-polymer waterproofing coating. For structural repairs, the correct Dr. Fixit product is Dr. Fixit Micro Concrete. It is an easy mix-up because the names sound similar.
Get the right repair material for your structure
Tell us what you are repairing, how deep, and how congested, and we will match it to the correct micro-concrete or repair mortar, grade, and quantity. Visit Khandelwal Trading Co. at Shop No. 4, Street No. 2, Maheshpur, Sector 21, Budanpur, Panchkula, call us on 94175 65977, or message us on WhatsApp. Trade enquiries are welcome through our get a quote page.
