https://www.concreteinfo.in/blog/index.html Practical, code-referenced articles on concrete technology, IS standards and construction QA/QC, written from 25+ years of field experience. en-in Sun, 02 Aug 2026 00:00:00 +0000 ConcreteInfo static blog https://www.concreteinfo.in/blog/b1-honeycombing-concrete.html https://www.concreteinfo.in/blog/b1-honeycombing-concrete.html Sun, 02 Aug 2026 00:00:00 +0000 Best Practice Honeycombing in concrete is a placement failure, not a mix failure. The five root causes, the six prevention tactics, the three repair thresholds, and the patch-repair procedure. IS 456 workmanship, with field-tested thresholds for when to call a structural consultant. https://www.concreteinfo.in/blog/b2-cover-blocks-spacers.html https://www.concreteinfo.in/blog/b2-cover-blocks-spacers.html Sun, 02 Aug 2026 00:00:00 +0000 Best Practice Why 25, 40 or 50 mm design cover fails on site: cover blocks, spacer wheels, chairs, IS 456 nominal cover, NDT checks and a five-step field procedure. https://www.concreteinfo.in/blog/t3-self-compacting-concrete.html https://www.concreteinfo.in/blog/t3-self-compacting-concrete.html Sat, 01 Aug 2026 00:00:00 +0000 Concrete Tech Self-compacting concrete (SCC) needs three properties — filling, passing, segregation resistance — and three field tests to prove them: slump-flow, J-ring, V-funnel. EFNARC limits, IS 10262:2019 (no SCC annex; the "IS 10262 SCC amendment" citation has no BIS publication), mix design shifts, and the failures conventional concrete's tests miss. https://www.concreteinfo.in/blog/s3-concrete-grade-selection.html https://www.concreteinfo.in/blog/s3-concrete-grade-selection.html Sat, 01 Aug 2026 00:00:00 +0000 IS Standards How to pick between M20, M25, M30, M35 and M40 for an Indian RCC member — IS 456:2000 Tables 3 and 5 (exposure conditions, minimum cement, maximum w/c, minimum grade), the worst-of-three rule, and a coastal-tower field story. https://www.concreteinfo.in/blog/mix-design-masterclass-is10262.html https://www.concreteinfo.in/blog/mix-design-masterclass-is10262.html Fri, 31 Jul 2026 00:00:00 +0000 Concrete Mix Design IS 10262:2019 (Second Revision) concrete mix design masterclass — target strength, water/cement selection, water content, cement content, aggregate ratio by absolute volume, admixture envelope, three trial mixes, and what to do when the trial mix fails. With worked M30 numbers, three SVG diagrams, questionnaire, checklist, and three what-happens-if cases. https://www.concreteinfo.in/blog/qa-qc-systems-itps-holdpoints-capa.html https://www.concreteinfo.in/blog/qa-qc-systems-itps-holdpoints-capa.html Fri, 31 Jul 2026 00:00:00 +0000 QA/QC Systems A site-level pillar on QA/QC systems for concrete works: ITPs, hold and witness points, method statements, NCR and CAPA loops, and quality records, mapped to IS 456, IS 1199, IS 516, IS 4926 and ISO 9001:2015. Indian first, ACI/ISO second. https://www.concreteinfo.in/blog/q3-slump-vs-slump-flow.html https://www.concreteinfo.in/blog/q3-slump-vs-slump-flow.html Thu, 30 Jul 2026 00:00:00 +0000 QA/QC Slump test measures consistency (mm) for vibrated concrete under IS 1199; slump flow measures spread diameter (mm) for self-compacting concrete under EFNARC. The two tests use the same Abrams cone but different procedures, different decision rules, and the 25-blow rodding mistake on an SCC can quietly cost a slab. https://www.concreteinfo.in/blog/b3-concrete-pour-card.html https://www.concreteinfo.in/blog/b3-concrete-pour-card.html Thu, 30 Jul 2026 00:00:00 +0000 Best Practice A printable pre-pour checklist of 14 checks organised in 4 clusters — before the truck, at the truck, at the pump, during placement. IS 456 workmanship, IS 1199 slump, with a one-pager ready to take on site. https://www.concreteinfo.in/blog/t2-curing-methods.html https://www.concreteinfo.in/blog/t2-curing-methods.html Wed, 29 Jul 2026 00:00:00 +0000 Concrete Technology Concrete curing methods using IS 456 curing minimums and ACI 308R-16 guidance — when water ponding beats membrane spray, when membrane spray beats steam, and how to pick the right method for slabs, columns and precast. https://www.concreteinfo.in/blog/q2-rmc-plant-audit.html https://www.concreteinfo.in/blog/q2-rmc-plant-audit.html Wed, 29 Jul 2026 00:00:00 +0000 QA/QC A four-hour, 515-checkpoint walkthrough of an RMC plant quality audit under IS 4925 and IS 9103: stockpile management, batching tolerances, admixture storage, transit-mixer discipline, lab and documentation, common audit findings, and a field-tested pass / conditional-pass / fail decision. https://www.concreteinfo.in/blog/s2-is10262-mix-design.html https://www.concreteinfo.in/blog/s2-is10262-mix-design.html Sun, 26 Jul 2026 00:00:00 +0000 Concrete Technology IS 10262:2019 (Second Revision) mix design — step-by-step M30 worked example: target strength, water content from Table 7 (Cl 6.2.4), aggregate ratio by absolute volume, PCE admixture dose, three trial mixes, plus IS 456 Table 11 compliance. https://www.concreteinfo.in/blog/q1-acceptance-criteria-is456-table11.html https://www.concreteinfo.in/blog/q1-acceptance-criteria-is456-table11.html Sun, 26 Jul 2026 00:00:00 +0000 Concrete Technology Learn IS 456 Table 11 concrete strength acceptance: fck, four-sample mean, individual-result limits, small-pour rules and failed-sample action. https://www.concreteinfo.in/blog/t1-admixtures-indian-concrete.html https://www.concreteinfo.in/blog/t1-admixtures-indian-concrete.html Sat, 25 Jul 2026 00:00:00 +0000 Concrete Technology Plasticisers, superplasticisers and accelerating admixtures in Indian concrete: IS 9103:2018 performance and uniformity tests, dosage-vs-slump curves, OPC/PPC/PSC compatibility, and cost per m³ worked example. https://www.concreteinfo.in/blog/s1-is456-15-clauses.html https://www.concreteinfo.in/blog/s1-is456-15-clauses.html Sat, 25 Jul 2026 00:00:00 +0000 Concrete Technology IS 456:2000 — the 15 clauses every Indian site engineer must know for RCC QA/QC: materials (Cl 6), workmanship (Cl 7), durability (Cl 8), cover (Cl 9), design constants (Cl 10), loads (Cl 11), structural design (Cl 12), slenderness (Cl 13), beams (Cl 14), columns (Cl 15), acceptance (Cl 16), footings (Cl 17), stirrups (Cl 18), development length (Cl 19), detailing (Cl 20). https://www.concreteinfo.in/blog/concrete-failure-field-guide.html https://www.concreteinfo.in/blog/concrete-failure-field-guide.html Fri, 24 Jul 2026 00:00:00 +0000 Failure Investigation A field guide to concrete failure investigation: seven failure families, investigative workflow, evidence and chain of custody, working with labs, and the repair-or-replace decision. Anchored to IS 456 Cl 16 and Cl 17, with ACI 562 and EN 1504 as international reading. https://www.concreteinfo.in/blog/concrete-materials-field-handbook.html https://www.concreteinfo.in/blog/concrete-materials-field-handbook.html Fri, 24 Jul 2026 00:00:00 +0000 Concrete Materials Concrete materials field handbook for Indian practice: cement (IS 269, IS 8112, IS 12269, 33/43/53 grade), fly ash (IS 3812), GGBS (IS 16714), silica fume (IS 15388), metakaolin, aggregates (IS 383), water (IS 456 Cl 5.4), and admixture interaction. Indian context first, ACI/ASTM as international guidance. https://www.concreteinfo.in/blog/concrete-repair-strengthening-method-selection.html https://www.concreteinfo.in/blog/concrete-repair-strengthening-method-selection.html Fri, 24 Jul 2026 00:00:00 +0000 Repair & Strengthening How to choose the right concrete repair or strengthening method: assessment, surface preparation, patch mortars, crack injection, jacketing, FRP, corrosion mitigation, and the repair-vs-replace decision. Rooted in IS 456 Cl 17 with EN 1504, ACI 546R and ACI 562 as international guidance. https://www.concreteinfo.in/blog/concrete-technology-training-programme.html https://www.concreteinfo.in/blog/concrete-technology-training-programme.html Fri, 24 Jul 2026 00:00:00 +0000 Technical Training Concrete technology training programme for Indian engineers: audience, online and on-site coverage, learning outcomes, sample schedule, trainer experience, participant resources and registration. https://www.concreteinfo.in/blog/concrete-testing-field-handbook.html https://www.concreteinfo.in/blog/concrete-testing-field-handbook.html Fri, 24 Jul 2026 00:00:00 +0000 QA/QC Field testing of concrete in India: IS 516, IS 1199 and IS 13311 procedures for sampling, fresh-concrete tests, hardened-concrete tests, non-destructive testing, statistical quality control and handling disagreements, with worked Indian examples and acceptance gates. https://www.concreteinfo.in/blog/durability-handbook.html https://www.concreteinfo.in/blog/durability-handbook.html Fri, 24 Jul 2026 00:00:00 +0000 Concrete Durability Concrete durability handbook for India: classify exposure under IS 456 Table 3, apply Table 5 water-cement ratio and concrete-quality limits, provide nominal cover, cure properly, and plan for service life. https://www.concreteinfo.in/blog/is-456-annotated-walkthrough.html https://www.concreteinfo.in/blog/is-456-annotated-walkthrough.html Fri, 24 Jul 2026 00:00:00 +0000 IS Standards IS 456:2000 annotated walkthrough — clause-by-clause field guide for site engineers. Materials (Cl 5–6), durability (Cl 8 + Tables 3, 4, 5), cover (Cl 26.4 + Table 16), workmanship (Cl 7), acceptance (Cl 15–16), investigation (Cl 17), with ACI 318 and EN 1992 cross-references and Indian context. https://www.concreteinfo.in/blog/ishikawa-fishbone-5-why-root-cause.html https://www.concreteinfo.in/blog/ishikawa-fishbone-5-why-root-cause.html Fri, 24 Jul 2026 00:00:00 +0000 QA/QC and Root-Cause Analysis A site-level guide to Ishikawa fishbone diagrams and 5-Why root-cause analysis for concrete QA/QC, NCRs and CAPA, with an end-to-end low cube-strength example. https://www.concreteinfo.in/blog/low-carbon-concrete-india.html https://www.concreteinfo.in/blog/low-carbon-concrete-india.html Fri, 24 Jul 2026 00:00:00 +0000 Low-Carbon Concrete Low-carbon concrete in India: why embodied carbon matters, cement and clinker, supplementary cementitious materials under IS 456 Cl 5.2 and Cl 8.2.4.2, LC3 and limestone calcined clay, recycled concrete aggregate, plant-side and project-side levers, the embodied-carbon vs strength trade-off, and tender language for low-carbon concrete with GCCA, IEA and EN 16757 as international guidance. https://www.concreteinfo.in/blog/rmc-plant-quality-management.html https://www.concreteinfo.in/blog/rmc-plant-quality-management.html Fri, 24 Jul 2026 00:00:00 +0000 QA/QC RMC plant quality management in India: five control zones, calibration, aggregate moisture correction, batch-ticket traceability, transit and placement, laboratory discipline, and plant-side failure prevention. https://www.concreteinfo.in/blog/special-concretes-field-handbook.html https://www.concreteinfo.in/blog/special-concretes-field-handbook.html Fri, 24 Jul 2026 00:00:00 +0000 Special Concretes Special concretes field handbook for India: HPC, UHPC, self-compacting, lightweight and aerated, fibre-reinforced, mass and high-volume fly ash, dry-mix mortars and grouts, with IS 10262, IS 456 Table 5, IS 9103 and ACI 363 / ACI PRC-239 / EFNARC references. https://www.concreteinfo.in/blog/water-cement-ratio-explained.html https://www.concreteinfo.in/blog/water-cement-ratio-explained.html Mon, 06 Jul 2026 00:00:00 +0000 Concrete Technology Water-cement ratio explained: w/c, w/cm and w/p definitions, IS 456 exposure limits for plain and reinforced concrete, free-water corrections, and an illustrative M30 calculation. https://www.concreteinfo.in/blog/self-compacting-concrete-mix-design.html https://www.concreteinfo.in/blog/self-compacting-concrete-mix-design.html Mon, 06 Jul 2026 00:00:00 +0000 Concrete Technology Self-compacting concrete (SCC) mix design: powder content, paste volume, three fresh-concrete acceptance tests (slump flow, J-ring, V-funnel), and EFNARC / ACI 237R-07 references. https://www.concreteinfo.in/blog/supplementary-cementitious-materials-scm-india.html https://www.concreteinfo.in/blog/supplementary-cementitious-materials-scm-india.html Mon, 06 Jul 2026 00:00:00 +0000 Concrete Technology Supplementary Cementitious Materials in India: fly ash (IS 3812), GGBS (IS 16714), silica fume (IS 15388), metakaolin (IS 16354), ultrafine GGBS (IS 16715), rice husk ash & ultrafine fly ash (IS 19058:2024, published Dec 2024) — composition, IS 456 blend limits, and selection by application. https://www.concreteinfo.in/blog/cold-weather-concreting.html https://www.concreteinfo.in/blog/cold-weather-concreting.html Mon, 06 Jul 2026 00:00:00 +0000 Concrete Technology Cold-weather concreting in India: IS 456:2000 Cl 13.4 sets a 5°C placement floor (control limit). IS 7861 (Part 2) gives mix-temperature targets, accelerator choice, and enclosure design. ACI 306R is international guidance. https://www.concreteinfo.in/blog/non-destructive-testing-ndt-concrete.html https://www.concreteinfo.in/blog/non-destructive-testing-ndt-concrete.html Mon, 06 Jul 2026 00:00:00 +0000 Concrete Technology Non-destructive testing of concrete in India per IS 516 series: rebound hammer (IS 516 Pt 5/Sec 4), ultrasonic pulse velocity (IS 516 series), and core sampling (IS 516 Pt 4) — when to use which method, combined interpretation. https://www.concreteinfo.in/blog/hot-weather-concreting.html https://www.concreteinfo.in/blog/hot-weather-concreting.html Tue, 10 Mar 2026 00:00:00 +0000 Concrete Technology Hot weather concreting in India: IS 456:2000 Cl 13.3 caps concrete at placement at 40°C — a control limit, not a target. IS 7861 (Part 1) and ACI 305R (international guidance) give evaporation, mix and curing controls. https://www.concreteinfo.in/blog/concrete-cracking-guide.html https://www.concreteinfo.in/blog/concrete-cracking-guide.html Tue, 10 Mar 2026 00:00:00 +0000 Concrete Technology 7 types of concrete cracks — plastic shrinkage, drying shrinkage, thermal, settlement, structural, chemical, crazing. Each one explained with cause, prevention and repair, with IS 456 crack-width limits. https://www.concreteinfo.in/blog/cube-testing-is516.html https://www.concreteinfo.in/blog/cube-testing-is516.html Tue, 10 Mar 2026 00:00:00 +0000 Concrete Technology IS 516 cube testing procedure: sampling, casting, curing, testing of 150mm cubes and IS 456 acceptance criteria with worked M30 example. https://www.concreteinfo.in/blog/reinforcement-steel-is1786.html https://www.concreteinfo.in/blog/reinforcement-steel-is1786.html Mon, 28 Jul 2026 00:00:00 +0000 IS Standards IS 1786:2008 reinforcement steel grades, D/S suffixes, mechanical properties, bond, development length, lap length, sampling and site acceptance. https://www.concreteinfo.in/blog/statistical-qc-concrete.html https://www.concreteinfo.in/blog/statistical-qc-concrete.html Mon, 28 Jul 2026 00:00:00 +0000 QA/QC Statistical QC of concrete: normal distribution, standard deviation, control charts, Table 11 acceptance criteria with worked M30 example. https://www.concreteinfo.in/blog/formwork-engineering-is14687.html https://www.concreteinfo.in/blog/formwork-engineering-is14687.html Mon, 28 Jul 2026 00:00:00 +0000 Best Practice IS 14687 formwork design: concrete lateral pressure, dead/live loads, deflection limits, stripping times and common failures. https://www.concreteinfo.in/blog/formwork-types-and-liners.html https://www.concreteinfo.in/blog/formwork-types-and-liners.html Mon, 28 Jul 2026 00:00:00 +0000 Best Practice Timber, steel, aluminium (MIVAN), plastic formwork; table forms, climbing, slip forming; form liners; tie systems; release agents; selection criteria.