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  1. Background Cement strength is the core indicator of cement quality and a fundamental guarantee of structural safety in construction projects. The updated GB/T 17671-2021 “Method of Testing Cements – Determination of Strength (ISO Method)” officially came into effect on July 1, 2022, replacing the 1999 edition. This revision systematically improves testing equipment requirements, operational procedures, and data processing methods, making China’s cement strength testing more scientific and closely aligned with ISO international standards. 2. Key Changes in the New Standard 1. Stricter Equipment Requirements Higher precision requirements for mortar mixers, jolting apparatus, and compression testing machines Enhanced requirements for structural rigidity and stability Mandatory calibration and performance verification 2. More Standardized Procedures Clear specifications for mixing water quality Standardized cement mixing procedures Detailed specimen moldi...

 Importance of Plaster Mortar Curing Curing plaster mortar is crucial in construction to ensure wall quality, bonding strength, and durability. Proper plaster mortar curing times help prevent cracks, hollowing, and improve subsequent works such as tiling or waterproofing. Construction professionals should plan curing periods based on mortar type and environmental conditions. 1️⃣ Ordinary Cement Mortar Curing Ordinary cement mortar is one of the most commonly used plaster materials. Under normal temperature (around 20℃) and humidity, it should be cured for at least 7 days. Keeping the surface moist promotes cement hydration, improves strength, and reduces the risk of cracking. Keywords: cement mortar curing, plaster mortar curing time 2️⃣ Cement-Lime Mortar Curing Cement-lime mortar combines the strength of cement with the flexibility of lime. A curing period of at least 7 days ensures full hardening and optimal bonding. Lime content is moisture-sensitive, so proper wet curing is es...

 Exterior wall paint may look like “just a layer of coating,” but in real projects, it is often one of the most failure-prone and costly materials to repair . Have you experienced these issues? ✔️ Color fading or chalking shortly after completion ✔️ Blistering, peeling, or water penetration after rain ✔️ Huge price gaps between “similar” exterior paints ✔️ Products passing sales claims but failing inspections 👉 In most cases, the problem lies not in application, but in incorrect selection and misunderstood testing standards . The core mission of exterior wall coatings is simple but demanding: to withstand complex, long-term outdoor environments . 1. Main Classification of Exterior Wall Coatings From an engineering and testing perspective, exterior coatings are commonly classified by binder type and decorative effect . 1️⃣ By Binder System (Durability-Oriented) Acrylic exterior coatings Silicone-acrylic coatings Pure acrylic or fluorocarbon systems fo...

 In construction practice, masonry mortar and plastering mortar are often regarded as interchangeable materials. They look similar, are both cement-based, and are sometimes used interchangeably on site to save time or cost. However, this misunderstanding is one of the most common reasons behind insufficient wall strength, surface cracking, hollowing, and plaster detachment. The real difference between these two mortars does not lie in minor formulation details, but in the fundamentally different roles they are designed to perform. Masonry mortar is a structural material. Its primary function is to bond bricks or blocks into a stable wall system and to transfer loads from the upper structure. As part of the load-bearing system, its design priority is compressive strength, bonding strength, and long-term durability. To achieve these properties, masonry mortar typically contains a higher proportion of sand with a relatively coarse particle size, giving it the rigidity and stability re...

1. What Is Anti-Crack Mortar? Anti-crack mortar is a special modified cement-based mortar designed to prevent surface cracking in buildings. It is produced by adding polymer modifiers, fibers, and other crack-resistant components to cement mortar. It is widely used in external thermal insulation systems, plastering layers, and local structural repairs. Key Features and Performance Anti-crack mortar works effectively due to the following properties: High flexibility (low shrinkage) : absorbs stresses caused by temperature changes and minor structural movement Excellent adhesion : bonds firmly to concrete, insulation boards, and cement substrates Good tensile strength : according to JG/T 158-2013 , the 28-day tensile bond strength should be ≥ 0.7 MPa Durability and environmental friendliness : water-based systems with good freeze–thaw resistance and weather durability Common Types Polymer-modified anti-crack mortar : the most widely used type, available in standard and high-flexibility ...

  — Most tile failures start with missed timing, not poor materials In tile installation, many problems are not caused by the adhesive itself, but by incorrect control of application time . Tile adhesive is not a “apply and forget” material—its performance depends heavily on whether each critical time window is respected . Missing these key moments can result in reduced bonding strength, hollow tiles, debonding, or even costly rework. Below is a clear, step-by-step guide to the most important timing points during tile adhesive application . 1. After Mixing: Use Within 2 Hours Once tile adhesive is mixed with water into a uniform paste, it typically has a pot life of around 2 hours . During this time: The adhesive maintains proper workability Bonding performance is stable and reliable As hydration progresses: The mixture gradually thickens Bonding strength continuously decreases Re-tempering with water after the pot life has expired will severely weaken adhe...