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cement expiry date

for how many months does a batch of bags of cement expires from the production date?

for how many months does a batch of bags of cement expires from the production date?

it is written on the bags but the atmospheric condition may alter the expiry date. if there is humidity than the bags will be expired quite quickly while the dry weather can take more time to expire the bags of cement. so also check the weather condition before storing the bags and try to make the dry storage place.

it is written on the bags but the atmospheric condition may alter the expiry date. if there is humidity than the bags will be expired quite quickly while the dry weather can take more time to expire the bags of cement. so also check the weather condition before storing the bags and try to make the dry storage place.

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cement shelf life - page 1 of 4

cement shelf life - page 1 of 4

Hello Sundar, The answer to both questions is;- it depends on the conditions of humidity and temperature under which the cement has been stored. eg;- If the container in which the cement has been stored is airtight andhas been stored in an environment where thetemperature and humidity have been carefully controlled, (eg air-conditioned or dehumidified room), thenthe cement mayremain fully reactivefor up to 12 months, as long as the container has not been opened. However, this is the best-case scenario and, in practice, cement is rarely stored in this way, except for bulk laboratoryreference cements. Bagged cement is not airtight and even if unopened should be used within afew months. Although again, the shelf life of individual bags depends on the conditions under which they have been stored. Atbest, correctly-stored, unopened bags might have a shelf life of up to six months. As long as the cement is less than six months old, has no lumps and is a completelyfree-flowing powder, it should be okay to use for non-structural purposes. All structural jobs (ie. jobs that require maximum strength) should always use fresh cement. Regards, Ted.

If the container in which the cement has been stored is airtight andhas been stored in an environment where thetemperature and humidity have been carefully controlled, (eg air-conditioned or dehumidified room), thenthe cement mayremain fully reactivefor up to 12 months, as long as the container has not been opened. However, this is the best-case scenario and, in practice, cement is rarely stored in this way, except for bulk laboratoryreference cements.

Bagged cement is not airtight and even if unopened should be used within afew months. Although again, the shelf life of individual bags depends on the conditions under which they have been stored. Atbest, correctly-stored, unopened bags might have a shelf life of up to six months.

As long as the cement is less than six months old, has no lumps and is a completelyfree-flowing powder, it should be okay to use for non-structural purposes. All structural jobs (ie. jobs that require maximum strength) should always use fresh cement.

Dear All, As per indian standards, cement with retention of more than 6 months, can only be used only after retesting for its conformance.Ted, an, thus, expired cement best be recycled by mixing with raw material to rejuvenate it again as clinker.Isn't it?Regards,Gulam Dastgir

Dastgir:Ted, an, thus, expired cement best be recycled by mixing with raw material to rejuvenate it again as clinker.Isn't it?Hello Gulam,Yes, that is one way, however it depends on the age and condition of the cement to be recycled. Ifcement is badly hydrated (ie. solid mass or large lumps with little or no free-flowing power) thenblending with the raw materials is really the only way to recycle it.But, if a significant proportion of free-flowing powder remains, and can be economically sparated from the lumps, then this can be blended back through the cement mill at a rate low enough to prevent quality impacts on the fresh cement. (ie all quality specifications are preserved)If the first option is used, care should be taken not to upset the ALK/SO3 balance too much, due to the extra SO3 contribution from the recycled cement. ie ALK/SO3 should be not be allowed to fall below 0.9 In addition, too much gypsum in the raw materials can also lead to sulphate spurrite (4CaO.2SiO2.CaSO4) build-ups in the middle to lowerparts of thepreheater where meal temperatures are between 700 and 910 deg. CRegards,Ted.

But, if a significant proportion of free-flowing powder remains, and can be economically sparated from the lumps, then this can be blended back through the cement mill at a rate low enough to prevent quality impacts on the fresh cement. (ie all quality specifications are preserved)

If the first option is used, care should be taken not to upset the ALK/SO3 balance too much, due to the extra SO3 contribution from the recycled cement. ie ALK/SO3 should be not be allowed to fall below 0.9

In addition, too much gypsum in the raw materials can also lead to sulphate spurrite (4CaO.2SiO2.CaSO4) build-ups in the middle to lowerparts of thepreheater where meal temperatures are between 700 and 910 deg. C

question: what happens if you use old cement? - ceramics

question: what happens if you use old cement? - ceramics

Can my cement still be used once it has passed its use by date? We strongly recommend that you do not use any cement that has exceeded its use by date. The use by date on cement is related to health and safety regulations about chromium VI which can cause allergic dermatitis.

Yes, mortar mix does go bad. I had an experience with some 20+ year old mortar mix. Looked good in the bag, had never gotten wet, but it never hardened properly and crumbled after drying, causing me to need to redo the whole project.1 Nov 2004

Cement is highly sensitive to moisture, and it hardens to forms clumps when exposed to water or dampness. The cement bags should be stored in a dry and enclosed structure, protected from rains and moisture and the stacked cement bags should be kept covered with waterproof sheets or tarpaulin.

Cement should be stored in dry, leakproof and moisture proof sheds with minimum number of windows and close fitting doors. The cement bags should be stacked on wooden planks placed about 150 to 200 mm above the floor. The space between stacks and exterior walls should be 450 to 600 mm.

Applying fresh mortar on top of old mortar that is loose or falling out will do little or no good; enough of the old mortar must be removed to make room for a layer of new mortar that is at least half an inch thick, and even then it is important to make sure that what is left of the old mortar is still solid and 3 Aug 1986

Hardened cement or concrete in a sack cannot be used for its original purpose, but there are several ways to salvage the material for new projects. The range of use depends on whether only the outside layer or the entire sack is hardened. Dry cement mix can become hardened in the sack if not stored properly.

In reality, their life span is more like 50-100 years, and sometimes less. Building codes and policies generally require buildings to survive for several decades, but deterioration can begin in as little as 10 years.17 Jun 2016

they will not last indefinately. They will eventually (about a year usually) absorb enough moisture to become a bag shaped rock. Provided they are not stored in a wet area where they can absorb more than just the humidity from the air, they should last indefinately.6 Mar 2008

Ready Mix Cement. Ready-mix cement is sold as rapid set or fast set ideal for a small projects like building a garden wall. Buy cement in 10kg tubs typically for domestic, smaller commercial/industrial or agricultural uses. Ready mix is ideal for making repairs to stone, brick, concrete and render.

The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.

When cement is mixed with water, its molecules form bond with each other with the help of water. Because of this chemical bond, the cement gets hardened. If it gets wet due to water or humidity in storage then we cannot used it again by drying it.

Cement has a shelf life of 3 months, when stacked properly. It cannot be stored indefinitely. Cement bags should be stored on an elevated surface within a dry leakproof shed protecting it from rain, moisture, sunlight and wind. No hooks should be used while handling cement bags.

Once the cement reached solid stage , not to use it . You can use small hammer to break the solid cement . If it is possible to get the cement in powder form , sieve it . This Cement can be mixed with good quality cement ( 25% old cement + 75% new cement ) and use in PCC concrete .7 Mar 2017

What is the expire date of PPC cement? A cement bag must be used before 3 months from its date of production. If you want to use the cement, then it should be tested for its strength before being taken into use.

Hence, it is possible to say that the best storing system for cement is place the bags of cement in an additional plastic bag and seal it. The cement also should be stored in a building which is dry, leak proof and as moisture proof as possible.

how long does bagged cement last? moneysavingexpert forum

how long does bagged cement last? moneysavingexpert forum

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