https://www.jufuchemtech.com/, https://www.jfchemtech.com/, https://www.construction-chemical.com/

Shandong Jufu Chemical Technology Co., Ltd., Bld. 4-405, No. 2177, Tianchen Road , Shandong, China, Jinan (2026)

17/08/2026

Methods to Re**rd Slump Loss

(1) Increase the dosage of high-performance water-reducing admixtures and raise the initial slump;
(2) Adjust the composition and dosage of re**rding components;
(3) When using lignin-based water reducers to formulate pumping aids, the dosage must not exceed 0.15%, and a foam-stabilizing agent must be added simultaneously;
(4) When using high-efficiency re**rding, air-entraining, water-reducing admixtures, a foam-stabilizing agent should be added simultaneously;
(5) Supplement with soluble SO3 if under-sulfation is detected;
(6) Early-strength agents capable of delaying the hydration induction period can also control slump loss;

(7) Adjusting to an optimal sand ratio can re**rd slump loss.

10/08/2026

The root causes of delayed slump increase and bleeding: issues regarding the properties and dosage of the admixture itself
1. Excessive dosage or uncontrolled release rate of controlled-release polycarboxylate superplasticizers:
This is currently the most common cause. Modern polycarboxylate superplasticizers generally employ a "controlled-release" molecular structure (achieving the gradual release of water-reducing groups via hydrolyzable linkages such as ester or amide bonds), originally designed to counteract slump loss over time. — When the dosage exceeds a critical threshold, the amount of superplasticizer consumed during the initial stage of cement hydration is limited; consequently, a large quantity of unadsorbed superplasticizer continues to hydrolyze within 30 to 90 minutes after mixing. This releases additional dispersing groups—such as carboxyl and sulfonic acid groups—which further break down cement flocculation structures and release entrapped water, causing the slump to increase rather than decrease. — If the hydrolysis rate of the controlled-release groups is mismatched with the ambient temperature (e.g., the release slows down at low temperatures or accelerates excessively at high temperatures), this temporal mismatch is exacerbated. For instance, at approximately 20°C, if a specific controlled-release superplasticizer reaches its peak dispersing effect exactly 60 minutes after mixing, the slump measured at the one-hour mark will be significantly higher than the value measured immediately after discharge from the mixer.

03/08/2026

The "Heart" of Polycarboxylate Superplasticizers: Polyether Monomers
How to choose:

For standard projects where cost control is a priority: Choose HPEG. It is a mature, versatile, and cost-effective option that meets the needs of the vast majority of ordinary concrete applications.
For high-temperature conditions, long-distance transport, or poor-quality aggregates: Choose TPEG.
When facing "challenging" conditions—such as summer construction, long transport distances, or aggregates with high silt content—TPEG’s superior slump retention and adaptability offer valuable peace of mind. For high-strength concrete where excessive stickiness is a concern: Choose EPEG.
MPEG represents a different technical approach (an esterification process) and is suitable for specialized scenarios requiring exceptionally long slump retention. If your production conditions allow for it and you specifically require this slow-release characteristic, MPEG remains a reliable choice.

20/07/2026

To control concrete slump, the following factors should be considered:
1) Fully understand the characteristics of the cementitious materials. Re**rders can be added to delay the hydration of aluminates (such as C3A), or slump-retaining agents can be used to mitigate the impact of cement fineness on slump loss over time.
2) Incorporate mineral admixtures in appropriate amounts. Adding materials like fly ash can save on cement and reduce costs, while also lowering the heat of hydration and enhancing long-term strength.
3) Fully account for the impact of ambient temperature. Generally, higher ambient temperatures lead to greater slump loss. Therefore, during summer operations, concrete mixing can be scheduled for the cooler hours of the morning or evening.
4) Select aggregates (sand and gravel) with low silt content whenever possible. In practical projects, if environmental constraints make it impossible to obtain aggregates with low silt content, the dosage of water-reducing agents should be increased to minimize slump loss. 5) Rationally design the concrete mix proportion. When designing the mix, factors influencing slump loss—such as ambient temperature, transportation distance, and the type of admixtures—must be fully considered. After the initial design, laboratory trial mixes should be conducted to ensure the concrete meets requirements for strength, workability, and durability; any issues identified should be addressed through timely adjustments.

13/07/2026

Concrete Shrinkage-Reducing Admixtures: The Secret Weapon to Prevent Cracking at the Source
1. Reducing Surface Tension (Core Technology): Capillary pressure—generated as moisture evaporates from concrete pores—is the primary cause of shrinkage. Shrinkage-reducing admixtures significantly lower the surface tension of the pore solution, reducing capillary pressure by 30%–50% and thereby substantially mitigating shrinkage.
2. Modifying Pore Structure: High-quality shrinkage-reducing admixtures optimize the distribution of pores within the concrete, creating a more uniform microstructure that further enhances crack resistance.
3. Synergistic Effects: Modern shrinkage-reducing admixtures are typically used in combination with other admixtures; they reduce shrinkage without compromising the concrete's strength development or workability.

30/06/2026

Defoamer: Rapid foam elimination and long-lasting foam suppression

Product Advantages
Rapid Foam Breaking: Instantly eliminates foam without disrupting production schedules
Long-lasting Foam Suppression: Effectively inhibits foam regeneration to ensure product quality
System Compatibility: Highly compatible with various admixture systems; causes no adverse effects
High Stability: Resistant to acids, alkalis, and high temperatures; suitable for diverse, complex operating conditions
Ease of Use: Can be added directly or diluted before use; simple to handle

22/06/2026

Redispersible polymer powder is a white powder produced by spray-drying a polymer emulsion; its defining characteristic is its ability to redisperse upon contact with water. When mixed with dry-mix mortar and water, the powder rapidly redisperses into a stable polymer emulsion that distributes evenly throughout the mortar system. As the mortar cures and dries, polymer particles form a continuous film within the framework created by cement hydration—acting like countless "flexible bridges" that firmly bind the aggregates and cement particles together. This mechanism is the key to the superior performance the powder imparts to the mortar. Compared to traditional liquid emulsions, the powder form significantly reduces transportation and storage costs while eliminating issues such as spoilage, freezing, and limited shelf life. It can be uniformly blended with dry materials—such as cement, sand, and lightweight aggregates—to create stable dry-mix mortar products that are ready for use simply by adding water on-site; this not only simplifies the construction process but also ensures consistent performance across different product batches.

15/06/2026

HPMC finds application across virtually all dry-mix material systems in construction, serving as a vital asset in various stages thanks to its stable and reliable performance.

In the realm of tile adhesives, HPMC plays a pivotal role in enhancing water retention and workability. If moisture is absorbed too rapidly by the wall or tile after application, incomplete cement hydration and reduced bond strength can occur, potentially leading to tile detachment later on. HPMC forms a uniform water film on the surface of the adhesive particles, locking in moisture and allowing the cement sufficient time to complete the hydration reaction, thereby significantly boosting bond strength. Additionally, it improves the thixotropic properties and slip resistance of the adhesive, preventing large-format tiles from sagging during installation and simplifying the application process.
In putty powder systems, HPMC primarily functions to retain water, increase viscosity, and improve application feel. Rapid moisture loss after application can cause peeling, cracking, and powdering, compromising the wall's smoothness and the quality of subsequent coating applications. HPMC’s water-retention capabilities ensure uniform moisture distribution as the putty dries, reducing the risk of cracking. Furthermore, it transforms the mixture into a smooth, fine paste upon mixing with water, offering lower resistance during application, higher efficiency, and a smoother, more refined finish.
In plastering mortars, HPMC serves multiple functions: water retention, thickening, and crack resistance. Whether for interior or exterior plastering, mortar water retention directly impacts construction quality. Insufficient water retention can lead to hollow spots and cracking during drying, impairing the wall's thermal insulation and impermeability. HPMC effectively locks moisture within the mortar, facilitating more complete cement hydration and enhancing both bond strength and crack resistance. It also improves mortar workability, ensuring a smoother plastering process and reducing surface defects. Beyond these uses, HPMC plays a significant role in self-leveling mortars, bonding mortars for thermal insulation systems, and gypsum-based products. In self-leveling mortar, it ensures material flowability and stability; in thermal insulation systems, it enhances the bond between adhesive mortar and insulation boards; and in gypsum products, it improves workability and water retention while reducing cracking. This broad compatibility has established HPMC as the recognized "all-round additive" in the dry-mix mortar industry.

08/06/2026

Types of Water-Reducing Agents:

By Appearance: Divided into aqueous solutions and powders. Aqueous solutions typically have a solids content of 10%, 20%, 40% (also known as mother liquor), and 50%, while powders generally have a solids content of 98%.

By Water-Reducing and Strengthening Capabilities: Divided into ordinary water-reducing agents (also known as plasticizers, with a water reduction rate of not less than 8%, represented by lignin sulfonates), high-efficiency water-reducing agents (also known as superplasticizers, with a water reduction rate of not less than 14%, including naphthalene-based, melamine-based, aminosulfonate-based, and aliphatic-based agents), and high-performance water-reducing agents (with a water reduction rate of not less than 25%, represented by polycarboxylate-based water-reducing agents), further subdivided into early-strength, standard, and re**rded types.

By Compositional Materials: Lignosulfonates, polycyclic aromatic salts, water-soluble resin sulfonates, naphthalene-based high-efficiency water-reducing agents, aliphatic high-efficiency water-reducing agents, amino high-efficiency water-reducing agents, polycarboxylate high-performance water-reducing agents, etc. Based on chemical composition, water-reducing agents can be categorized as follows: lignin sulfonate water-reducing agents, naphthalene-based high-efficiency water-reducing agents, melamine-based high-efficiency water-reducing agents, aminosulfonate-based high-efficiency water-reducing agents, fatty acid-based high-efficiency water-reducing agents, and polycarboxylate-based high-efficiency water-reducing agents.

01/06/2026

Precautions for Water-Reducing Agent Application

① Ensure compatibility with cement. This is fundamental to the use of water-reducing agents and must be taken seriously in terms of compatibility with cement. If the two are incompatible, the water-reducing effect will not only be ineffective, but it will also lead to reduced project quality and increased construction costs.

② Correctly select the water-reducing agent. To ensure the water-reducing agent functions effectively, it is essential to select the correct agent based on actual conditions. Different water-reducing agents should not be mixed to prevent adverse effects on concrete quality.

③ Pay attention to the quality of the water-reducing agent. There are many types of water-reducing agents, and their quality directly affects the quality of concrete. Therefore, when selecting a water-reducing agent, avoid using substandard ones during construction.

④ Control the dosage of the water-reducing agent. The dosage of the water-reducing agent directly affects the quality of concrete. Too little or too much water-reducing agent will not achieve the maximum effect and may even lead to engineering accidents. Therefore, the dosage of the water-reducing agent must be strictly controlled during use.

Shandong Jufu Chemical Technology Co., Ltd.

17/08/2026

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