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

18/05/2026

The issue of compounding polycarboxylate superplasticizers: Polycarboxylate superplasticizers cannot be compounded with naphthalene-based superplasticizers. If both superplasticizers are used in the same equipment, incomplete cleaning can also cause interference. Therefore, it is now generally recommended that polycarboxylate superplasticizers be used in a separate equipment. Based on current usage, air-entraining agents and polycarboxylate salts show good compatibility, largely because the low dosage of the air-entraining agent allows it to "dissolve" in the polycarboxylate superplasticizer, enabling further compatibility and complementarity. Sodium gluconate in retarders also shows good compatibility, but poor compatibility with other inorganic salt admixtures, making compounding difficult.

11/05/2026

Applications of Sodium Lignosulfonate:

1. Dye Industry: Sodium lignosulfonate is used in large quantities and has high requirements in the dye industry. It is mainly used in the production of disperse dyes, vat dyes, and reactive dyes.

Specific Functions: It acts as a dispersion medium during dye grinding, helping to refine particles to the micron level, preventing fine particles from re-aggregating during drying or storage, improving the heat resistance stability of dyes, avoiding color spots during high-temperature dyeing, and improving the uniformity of dye dispersion in the dye bath.

2. Concrete Admixture: Sodium lignosulfonate is a common water-reducing agent.

Performance Characteristics:
Water Reduction Rate: 8%～12%
Air Content: ≤3%
Setting Time Difference: Initial setting extension 60～120 minutes
Compressive Strength Ratio: 3d≥110%, 7d≥110%, 28d≥100%
No Corrosion to Reinforcing Steel
Usage Recommendations:
Recommended dosage: 0.2%～0.3% of the cementitious material mass.
It can improve slump retention when combined with high-efficiency water-reducing agents.
Adaptability varies greatly among different cements; it is recommended to conduct a cement paste fluidity test.

27/04/2026

Improvement measures for the poor compatibility between cement and polycarboxylate admixtures:
① Improve cement production technology to produce low-heat cement, low-alkali cement, fine-gradation cement, and high-durability concrete cement compatible with polycarboxylate.

② Strengthen cooperation and communication among cement researchers, laboratory personnel, admixture supplier technical service personnel, and field testing personnel in practice to gradually explore the intrinsic factors of the compatibility between polycarboxylate and cement, and continuously develop cement production technology and improve admixture synthesis technology.

20/04/2026

How to compound concrete admixtures?

1. When preparing admixtures, it is essential to fully consider their compatibility with various raw materials, and pay attention to the interactions between different components and the order in which solids dissolve.
2. Different cements and admixtures, as well as other components in the admixture, have a significant impact on the performance of water-reducing agents. For example, when naphthalene-based water-reducing agents are used together with sodium gluconate, the water reduction rate is significantly improved. Organic and inorganic admixtures should be rationally combined.
3. Different cements and admixtures, as well as different mix proportions, will affect the retarding effect.
4. The air-entraining effect of air-entraining agents is affected by many factors, such as cement fineness, aggregate size, sand mud content, temperature, and mix proportion. When adding fly ash, there are more fine materials, smaller aggregate size, larger slump, and lower temperature, resulting in higher air content in the concrete.

13/04/2026

How do water-reducing agent technicians adjust the state of concrete?

When preparing concrete mixes at a batching plant, it's crucial to ensure both the workability and strength of the concrete. To achieve this, the first batch of concrete at the batching plant should be tested in multiple batches. The initial test assesses the workability of the concrete mix. Based on the results, the material usage for the second batch is estimated. After each test, further adjustments to the mix proportions are determined based on the results, until the concrete test results meet the construction requirements. During adjustments, at least the following four factors must be considered: 1) the extended transport time due to distance; 2) the construction process, whether to use a pump truck or crane for delivery; 3) the pouring location, the density of reinforcing steel and corrugated pipes; and 4) the construction environment, such as varying temperatures and weather conditions. Based on the results of the concrete mix trials, the final construction mix proportions are determined.

07/04/2026

Reducing air bubbles on the concrete surface is a comprehensive task that cannot be achieved by one or two methods alone. The following are some commonly used methods and points to note in actual construction:

⑴ Appropriately extend the concrete placement time.

⑵ Adjustment of polycarboxylate superplasticizer. Polycarboxylate superplasticizer manufacturers should not add air-entraining agents during production; if necessary, an appropriate amount of defoamer can be added.

⑶ Improve construction techniques. Improving construction techniques is particularly important for reducing concrete air bubbles.

⑷ Select good release agents and formwork. Practice has shown that selecting good release agents is very effective in eliminating air bubbles on the concrete surface.

23/03/2026

Concrete water-reducing agents are admixtures that reduce water content and strengthen concrete, offering significant technical and economic benefits. While maintaining a constant slump, using water-reducing agents can reduce the water content per unit of concrete, lower the water-cement ratio, thereby increasing concrete strength, density, and durability. While maintaining a constant water content, water-reducing agents can enhance the fluidity of concrete. While maintaining constant concrete strength, water-reducing agents can reduce cement usage, achieving material savings and energy reduction. In actual construction, commonly used water-reducing agents include ordinary water-reducing agents, high-performance water-reducing agents, and high-efficiency water-reducing agents, and the appropriate type should be selected based on the specific circumstances and operational requirements.

09/03/2026

Phenomena of using polycarboxylate-based and naphthalene-based water-reducing agents in combination:

Case 1: Concrete prepared with both polycarboxylate-based and naphthalene-based water-reducing agents was poured into the same location, resulting in severe formwork adhesion during shear wall demolding. During a trial application of polycarboxylate-based water-reducing agents, a mixing plant supplied concrete to two construction sites with different mix proportions of polycarboxylate-based and naphthalene-based water-reducing agents. Due to a power outage at one site, a truckload of concrete prepared with polycarboxylate-based admixtures was dispatched to that site. As a result, severe formwork adhesion was observed during wall demolding at that site.

Case 2: Mixing leftover concrete prepared with naphthalene-based water-reducing agents resulted in extremely poor concrete workability. A production worker mixed a small amount of leftover concrete prepared with naphthalene-based water-reducing agents into concrete prepared with polycarboxylate-based water-reducing agents. The resulting concrete, with a slump of 190mm at the factory, only reached 100mm upon delivery to the construction site, exhibiting almost no fluidity. During vibration, it took a considerable amount of time for the pores to close after the vi****or was removed.

Reason 1: Concrete prepared with two different admixtures has different setting times and shrinkage rates. The two admixtures react adversely when mixed.

Prevention 1: Concrete prepared with two different admixtures should not be used simultaneously in the same location. If a problem is discovered, communicate with the construction site in advance and appropriately delay the formwork removal time. The two admixtures must be used strictly separately; ideally, production should be carried out at fixed stations, on fixed trucks, and at fixed construction sites.

02/03/2026

Factors affecting concrete slump loss:

1. The influence of cement on concrete slump: The mineral composition of cement affects the slump loss of concrete. The main mineral components in cement are C3A (tricalcium aluminate), C4AF (tetracalcium aluminoferrite), C2S (dicalcium silicate), C3S (tricalcium silicate), and small amounts of other components. Different mineral components have different degrees of adsorption on water-reducing agents. Under the same conditions, the adsorption capacity of the main mineral components in cement for water-reducing agents follows the order: C3A > C4AF > C3S > C2S.

2. The influence of water content per unit volume and water-cement ratio: Water content per unit volume refers to the total water content in a unit volume of concrete. It is a major factor affecting the workability of cement concrete. In freshly mixed concrete, water forms a water film on aggregates, cement particles, and mineral admixture particles, making the particles more lubricated and creating fluidity.

24/02/2026

Those who don't understand admixture-based slurry enhancement will never design a reasonable mix proportion.

Technical Guidance:
1. The biggest problem is a layer of bubbles on top of the concrete. These bubbles absorb carbon, forming small black foams. This is caused by poor adaptability, excessive admixture application, and high sensitivity.
2. If the admixture doesn't enhance slurry enhancement, it results in poor coating, with no slurry on the aggregate, leading to a loose and crumbly texture.
3. A high sand ratio results in a large aggregate surface area, causing sand to coat the cement, resulting in a rough and astringent texture. This is similar to a mixed aggregate, and has little to do with gradation. Poor admixture adaptability and high sensitivity cause bleeding even before dissolving, with oil and carbon rising to the surface and adsorbing with the bubbles to form a layer of foam. This is the key issue. The admixture's failure to enhance slurry enhancement and the high sand ratio both lead to loose concrete, a large aggregate surface area, and sand coating the cement, resulting in a poor mixed aggregate.

09/02/2026

Analysis of Issues in Concrete Admixture Testing:

1. Cement Used for Testing: According to relevant standards, dedicated reference cement should be used to test the performance of concrete admixtures. Some companies believe that admixtures that pass the test using reference cement are not effective in actual construction and therefore tend to use engineered cement for testing. Research has shown that the compressive strength ratio tested using engineered cement is higher than that tested using reference cement. The results obtained using engineered cement are not significantly different with varying amounts of admixtures, while reference cement can reflect the quality level of the admixture. Therefore, national testing standards should be strictly followed, and reference cement should be used for admixture quality testing.

2. Air Content: Air content is an important performance indicator of concrete. A certain air content can improve the durability and workability of concrete. After mixing, transportation, pumping, and vibration, the air content of concrete changes significantly compared to laboratory test results. Furthermore, the air content tested using reference cement is higher than that tested using engineered cement. This is mainly because engineered cement contains more admixtures, which absorb some gas. Existing manufactured sand has high mud content and poor gradation, and most of it cannot meet the Class II sand standard. When configuring admixtures, in order to meet the workability requirements of concrete, it is necessary to increase the amount of air-entraining agent, which can easily lead to excessive air content. Therefore, if the air-entraining agent dosage is fixed and the impact on concrete strength is not significant, the air content index can be appropriately relaxed.

Shandong Jufu Chemical Technology Co., Ltd.

18/05/2026

11/05/2026

27/04/2026

20/04/2026

13/04/2026

07/04/2026

23/03/2026

09/03/2026

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24/02/2026

09/02/2026

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