FAQs

Curing Related FAQS Q1. Although curing on the horizontal surface is facilitated by flooding the water by bunding along the periphery, curing on the vertical surfaces like chimneys, high rise buildings is difficult. So how can curing on vertical surfaces be carried out? OR How to carry out curing in areas like Middle East or mountainous regions where water is in shortage? A1. Our curing compounds like DURACURE is ideal in such cases. The vertical surface has to be sprayed with DURACURE
Moreover, use of DURACURE is also recommended for construction activities carried out in water scarce regions. Q2. Sometimes the top surface of the concrete is exposed to high solar energy which causes it to crack due to fast evaporation of surface water. What is the solution? A2. DURACURE WP which is having solar reflective pigments (reflects 60% of the heat) can be used in such cases. SHUTTERING RELATED FAQS Q3. Generally engineers prefer use of mobil oil, cow dung as a shutter release agent to reduce cost. But often such agents due to the presence of organic impurities which are acidic in nature cause scouring of concrete surface. Moreover use of such agents give a poor coverage of around 5-10 m2 per litre and forms a stain/pitting on the surface. What other alternatives do we have? A3. Due to scouring effect on the surface, painting or any other surface treatment becomes difficult. Under such a situation, DURAMOL, a high quality mould release agent can be used with better release property. In addition to its release properties, DURAMOL also gives a coverage of 40-50 m2/litre and provides a fair faced concrete free of any blowholes/pitting. BONDING RELATED FAQS Q4. How can structural members be joined to each other? How can cantilever extension be carried out from the existing surface? A4. Here the use of structural adhesives like DURAXYBOND is recommended. It is applied on the existing surface followed by placing fresh concrete Q5. Do you have any products for joining structural members as in the case of segmental bridge construction? A5. Our segmental bridge adhesive i.e. DURAXY SBA can be used in such cases. SILICONE IMPREGNATION RELATED FAQS Q6. Sometimes efflorescence/ dampness can be noticed inside the room of a building after a heavy downpour. How can such a problem be arrested? A6. This can be stopped by coating the external wall of the building with DURAPEL W/S used as a raincoat.

Q1. Some engineers feel admixtures added to concrete may improve physical properties but are detrimental in the term long term durability of concrete. Is this true? A1. The above statement is misleading especially in reference to detrimental properties so as to when admixtures are added to concrete. Infact, proven admixtures based on lignosulphonates (LS), naphthalene sulphonates (NSF), melamine sulphonate (MSF), polyhydroxy carboxylic acid salts, poly carboxylate and poly carboxylate ether would not only improve the properties like increase and maintenance of slump, cohesion of concrete, reduction of bleeding, ease of compaction but also lead to ultimate durability of concrete in both fresh and hardened states. Q2. How should we choose admixtures for a particular use? A2. Choice of admixtures depends on the purpose of its use:
a) For simple increase in the workability, use DURASPRED N. Typically slump may be increased by 100% at a dosage rate of 0.5% by wt. of cement. This slump may last for 15 minutes. If you wish to have maintenance of slump for a longer period, such requirement should be brought to our notice so that tailor made solution may be provided.
b) For increase in strength by 15-20%, water reduction upto 10% may be carried by adding DURASPRED N.
c) Cement saving upto 10% is also possible by maintaining the same W/C.
Note: While using DURASPRED N, all the three advantages as mentioned above can be achieved at once but that would require a little compromise in the strength increase and water/cement reduction. Q3. Where should we use DURASUPASPRED? A3. DURASUPASPRED is available in 2 versions, i.e., normal i.e. DURASUPASPRED and retarded i.e. DURASUPASPRED 500/ 400C. The normal version may be used for high slump concrete which has to be used in 10 mins. Also super water reduction can be achieved which would result in 25-30% strength development very quickly. The retarded version may be used where slump has to be maintained for a longer period of time and strength development needs to be gradual. It is highly useful for pumping concrete. Q4. What is the purpose of using DURAMICROSILICA? A4. It is used where it is difficult to achieve the desired strength of concrete especially for high strength concrete M50 and above. Q5. Shotcreting operation in a tunnel leads to rebound loss of concrete up to 40% and the possibily of washout through the oozed water is very high. How can this be resolved? A5. The same can be resolved by using DURASHOT P/L in wet as well as dry process.
Note- Alkali containing accelerators may have strength loss to the extent of 30%. In such cases by using alkali free accelerators i.e. DURASHOT LAF is strongly recommended where strength fall would be minimum. Q6. Nowadays mixing water in most of the projects contains high chloride levels that may lead to corrosion of reinforcement of concrete over a period of time. Do you have any material to counteract this hazard? A6. According to an European analysis, Corrosion is the biggest deterioration mechanism of a structure leading to crores of rupees wasted in the repair and rehabilitation annually. To counteract this problem, we have DURACOROBIT 60 that can be used at the rate of 0.7L per m3 of concrete which neutralises the effect of chloride. Q7. Sometimes corrosion of reinforcement takes place due to reduction of alkalinity in a hardened concrete. Can we arrest the phenomenon of further corrosion? A7. Yes we have a pH enhancer like DURALISER which can be injected to increase the pH levels and maintain the alkalinity of concrete. As a result corrosion levels can be checked.

Grouting Related FAQS Q1. How can porosity/honeycombing of concrete structure be reduced to a maximum extent? A1. This can be done in 2 ways:
The cement milk must be admixed with DURAEV (Non shrink polymeric grouting compound). This slurry must then be introduced into the structure through grout pump.
Also ready to use grout like DURAGROUT E1 (only the required quantity of water needs to be added) can be injected. Q2. How can holding down bolts be grouted/ anchored in the foundation? A2. This can be done by pouring DURAGROUT GP in the holding down bolt pocket. Q3. How can base plate be grouted so that it is perfectly leveled for the subsequent erection of machine? A3. This can be done by forming a hydrostatic head pocket through which fluid DURAGROUT GP can be poured to complete the base plate grouting. Tiling Related FAQS Q4. It is observed that tiles on bathroom/ kitchen walls fall off and water seeps in through the joints of tiles. As a result, the other side of the wall surface gets damaged due to dampness/ efflorescence. What is the solution? A4. The tile should be fixed with DURAXY 1P/2P and the joints should be filled with DURATILOFIL. The tiles fall due to shrinkage or due to expansion of air entrapped between the tile and the wall. Flooring FAQS Q5. Sometimes dust accumulates on the factory floor due to release of lime. How can such a problem be resolved? A5. Such a problem can be solved using floor sealer DURAFLORSIL/DURAFLORHARD. Q6. It is seen that the floor surface in a huge factory area is weak due to excessive presence of water during the laying of fresh concrete. As a result, concrete surface develops poor strength and is not waterproof which results in scouring. What solution does DURA have? A6. In such a situation DURAHARD can be used which makes the surface highly impermeable and abrasion resistant. Joint Sealants Related FAQS Q7. How can expansion/ contraction joints be treated? A7. Our polysulphide compound viz., DURASIL GPS which is non sag and gungrade can be applied on vertical as well as horizontal surfaces. However DURASIL PPS can be applied on only horizontal surfaces like airport runways, etc. Q8. Often window and door joints get cracked due to expansion/ movement between two elements. How can this be resolved? A8. This can be solved by using DURACRYL MP, joint sealing compound. It can be used for filling gaps and joints in concrete, doors, windows, etc.

Q1. Sometimes deep cracks appear on the concrete surface and in some cases spalling is observed. How can this be resolved? A1. Cracked concrete/ delaminated concrete should be cut back upto sound concrete surface and sometimes below the reinforcement where huge corrosion products may be formed. This needs total cleaning before application of our R&R system. Sometimes sand blasting as a cleaning method may be adopted to remove rust/ loose particles from steel surface. Now once the surface has been prepared, the surface treatment can be provided in 3 ways:

1. The prepared surface must be coated with DURARUSTOBIT to prevent further corrosion. This should be followed by filling the surrounding area with mass-in-fill (Mass-in-fill refers to Cement: Sand: DURAKRIT mortar mixed in the ratio 1: 2.75: 0.5 followed by adding requisite amount of water).
2. The prepared surface must be coated with DURARUSTOBIT as above followed by application of DURAXY primer. Then the surrounding area of the concrete should be filled with DURAXY RM (2 pack system).
3. Another alternative is to treat the steel rod with DURAKRIT: cement slurry in the ratio 1:2. This can be followed by mass-in-fill as in (1)

Q2. Corrosion/ sulphate attack leads to reduction of the cross section of the concrete beams/ columns. As a result, the strength along with the load bearing capacity of the structural element gets diminished. How can such a problem be addressed? A2. In such a situation, necessary surface preparation in the form of cleaning must be adopted. Then jacketing with the help of DURAMICROKIT (Very high strength micro concrete powder) would solve the problem so that the necessary strength could be achieved. Q3. Often surface cracks appear on concrete/ masonry surface due to expansion, heat cracks or excessive shrinkage. What answer does Dura have? A3. In such situations DURASILFIL 1P/2P can be used as it is a flexible and non shrink sealing material.

Q1. Why should we use construction chemicals as they are known to increase construction cost? A1. The myth surrounding the Indian construction sector that construction chemicals increase construction cost is purely hypothetical and short-term based. Although, it accounts for less than 2% of the overall construction cost, long term benefits are in multiples. They have the ability to improve the fresh and hardened properties as well as enhance the durability and sustainability of the structure. Currently, more than 60% of the construction cost is spent on repair and rehabilitation. Thus, the need for the hour is to pursue good construction practices at the conception stage by using materials which can maintain the integrity of the structure throughout its design life. Q2. What assurances can you provide relating the quality of your products? A2. As mentioned in our company's motto "Quality,Integrity Assured", you can be rest assured regarding the quality and performance of our products. Our high-end research facilities and quality management systems designed by seasoned professionals who have served in top MNCs in the same sector means that you would get international quality products with an indigenous taste. Q3. Another company is providing me an equivalent product at a lower price. Why should I go for your product? A3.There are many small companies who have entered the construction chemicals sector and are selling products deceitfully. Beware of them as their products are diluted versions having low grade quality. We pride ourselves on quality as all our products come with a QA certificate attested by our QC personnel. However, each of our products is available in different grades as well to suit your price and functional requirements. In any case you can be rest assured of best competitive rates.. Q4. Can you provide any guarantee regarding the performance of your products? A4.There are many external factors like environmental/ climatic, workmanship, storage conditions which may affect the performance of construction chemicals. Hence, rarely do companies like us give guarantee on their products. However, the products are validated in terms of their performance and specifications before and after manufacture. This is true especially in case of functional products like plasticisers, grouts, curing, bonding, sealing compounds. Visual products like waterproofers can carry guarantees which often depend on the applicators applying those products. Dura shall at all times provide any technical support needed during the course of usage of the product. Q5. How much time does it usually take for order delivery? A5.Our manufacturing system is developed in a way so as to minimize the lead time taken to deliver products. The time taken usually varies depending on the distance. However, in most cases, the order is delivered within 3-4 days against purchase order. Q6. What are your payment terms and conditions? A6.Any one of the following payment terms is usually accepted by the company. However, advance payment is the most preferred option which can also fetch attractive discounts at the discretion of our marketing department.
=>Upto 10-14 days post dated cheque => Payment against delivery (discounts available)
=> 30- 45 days credit. Q7. Are you open to new business opportunities like technical collaborations, distributorship, and business associate-ship? A7.We are constantly looking for new business ventures, markets and would welcome such opportunities. We would like to transfer the technical knowhow gained over the years to suitable organizations that fit in our culture.