US3582376A – Quick-setting cement composition containing portland cement,alpha gypsum and a dispersant – Google Patents Julie 1 1971 T.5. AMES QUICK-SETTING CEMENT COMPOSITION CONTAINING P crammwensummn A DISPERSANT eH’Sept.9, l 68 s M S R E M Y m M. N A MR E.0 Vs N A s United States Patent Int.
- Cl. C04b 13/14 US.
- Cl.106-90 8 Claims ABSTRACT OF THE DISCLOSURE Craters and earth voids are quickly filled with a highstrength, quick-setting cement composition comprising a mixture of cement material consisting essentially of from about 9.5 to about 4 parts by weight of calcium sulfgge hemihydrat to about 0.5 to about 6 parts by weight mimic-GEE! and water which is present in a quan- 1 hour corn- Cold Dry cement Acid Slurry pressive chamber material temp., temp strength, Acid percent temp, F.
temp., F.F.F.p.s.i. It is preferred that the viscosity of the quick-setting cement of the present invention be maintained at below about 250 centipoises to facilitate pumping, and the limits of pumpability are at about 100 poises. For this reason, if the quick-setting cement is to be pumped it must be maintained at a value less than 100 poises.
Having described the invention in connection with certain specific embodiments thereof, it is to be understood that further modifications may now suggest themselves to those skilled in the art and it is intended to cover such modifications as fall within the scope of the appended claims. What is claimed is: 1.
A quick setting cement composition consisting essentially of a mixture of 9.5 to 4 parts by weight of alpha gypsum and 0.5 to 6 parts by weight of portland cement together with a minor effective portion of a dispersant.2. The cement composition of claim 1 further comprising from 22 to 70% by weight water based on the 12 quantity of said alpha gypsum and portland cement in said composition.3.
The cement composition of claim 2 consisting essentially of from 9.5 to 7 parts by weight of alpha gypsum and from 0.5 to 3 parts by weight of portland cement, and from 22 to by weight water based on the quantity of said alpha gypsum and portland cement in said composition.4. A mass of hardened material bound by the setting action of the composition of claim 2.5.
The cement composition of claim 1 containing 9.5 parts by weight of alpha gypsum and 0.5 part by weight of portland cement.6. The cement composition of claim 1 wherein said dispersant is the sodium salt of sulfonated naphthalene formaldehyde.7. The cement composition of claim 2 further comprising a minor effective proportion of an inorganic acid accelerator.8.
- The cement composition of claim 7 wherein said acid is hydrochloric acid.
- References Cited UNITED STATES PATENTS 1,558,783 10/ 1925 Bleecker 94-24 1,705,088 3/1929 Hipple 94-24 3,179,528 4/1965 Holmgren 106-90 3,232,778 2/1966 Dean 106-89 2,798,003 7/1957 Morgan et al.106-90 2,690,975 10/1954 Scripture 106-90 2,310,023 2/1943 Gardner 106-110 2,172,076 9/1939 Wolf et a1 106-111 1,923,370 8/1933 Hansen 106-89 1,901,056 3/1933 Randel 106-89 933,036 8/1909 Headson 106-97 581,466 4/1897 Kleber 106-110 OTHER REFERENCES F.C.
Welch Journal of the American Ceramic Society, vol.6, No.11, November 1923, pp.1204-6. JAMES E. POER, Primary Examiner W.T. SCOTT, Assistant Examiner U.S.Cl.X.R.10689, 97, 109, 110, 315, 287 soil stabilization : US3582376A – Quick-setting cement composition containing portland cement,alpha gypsum and a dispersant – Google Patents
Contents
- 1 Which compound is added in quick setting cement?
- 2 What is the best quick setting concrete?
- 3 How strong is quick cement?
- 4 How fast is quick setting cement?
- 5 Which of the following compound is added to cement?
- 6 Which of the following add a quick setting time of cement?
- 7 Which compound added to cement clinker?
Which compound is added in quick setting cement?
Free 10 Questions 30 Marks 10 Mins Quick setting cement means the cement which sets early. Quick setting cement is prepared by adding small amount of alumina in finely grinded cement clinker and reducing the proportion of calcium sulphate (Gypsum). Applications: 1.
Grouting 2. Under water concreting. Important point: Quick setting cement should not be confused with rapid hardening cement. Rapid hardening cement develops higher rate of gain of strength while quick setting cement sets quickly only and its rate of gain of strength is similar to ordinary Portland cement.
Note: This is SSC JE Official question and answer. Option 1 and 3 both can be correct as per concept but, Option 3 is more appropriate. Last updated on Sep 22, 2022 UPPSC AE Final Result Out on 1st December 2022. The candidates appeared for the interview from 17th October to 15th November 2022.
Where is quick setting cement used?
The initial setting time for this kind of cements are about 5 minutes and the final setting time is about 30 minutes. It is used in under-water construction, in running water conditions, in rainy & cold weather conditions, in anchoring & tunnelling and also where quick strength is needed in short span of time.
What is quick setting cement called?
What Is Quick Setting Cement? – Quick setting cement is one of the types of cement. This cement setting time very high like initially set in 5 mins and the final set is achieved in 30 mins, and ordinary cement initially set in 30 mins, and the final set is achieved in 24 hours, so we are told that cement Quick setting cement.
What is the best quick setting concrete?
3. BEST FOR SETTING POSTS: Quikrete Fast-Setting Concrete Mix – Are you replacing a fence, mailbox, or lamppost, or installing a swing set or basketball hoop for the kids? Setting the posts for these common outdoor structures in concrete makes for sturdier, safer, and more stable structures in the long run.
Because posts can be unwieldy to handle, it’s best to select a concrete product that sets quickly. That’s where Quikrete Fast-Setting Concrete Mix comes in. It will let you set your posts pronto and finish the project faster. The special blend of cement, sand, and gravel can be poured directly into a posthole and then topped with water—no mixing required.
Even better? The fast-setting formula saves time and spares your arms the fatigue of standing around holding a post while waiting for the concrete to cure. It sets in a speedy 20 to 40 minutes! Take a peek at the video tutorial to see for yourself how quick and easy it is to set your own posts with Quikrete. 
Photo: quikrete.com
How do you make quick set concrete?
1. Bags of Pre-Mixed Concrete Can Be Bad When You Buy Them – To use Fast-Setting Concrete, all you must do is add water to the pre-mix. This sounds simple, but often when being delivered to the store, the mix is exposed to the elements. If caught in the rain or humidity long enough, the concrete mix will absorb some of the moisture and begin hardening.
How strong is quick cement?
Summary: Is Quikrete As Good As Concrete? – Quikrete premixed concrete is just as good, and strong, as traditional concrete you buy from a plant or concrete you mix on site. Concrete is made from sand, cement and aggregate stone and that’s exactly what’s in Quikrete premixed concrete.
Premixed bags are very easy to work with because all the ingredients are already put together in the correct ratio for the strength you need. Bags come in a variety of strengths as high as 5000 psi so you can build just about anything with Quikrete right out of the bag. And if you need something special like reinforcements or color, you can add additional ingredients to Quikrete just like you can with traditional concrete.
Quikrete offers a variety of mixes for all sorts of applications. These include traditional mixes in a variety of strengths and attributes like fast setting and crack resistant. They even offer mixes for special applications like building shower pans or countertops.
- One of the most popular Quikrete mixes we use is the fast setting mix.
- It’s very strong and sets much quicker than traditional concrete.
- If you doing a job that’s time sensitive, like installing fence posts, you’ll love having a concrete that hardens fast.
- Quikrete fast setting concrete is just as strong as regular concrete.
Concrete gets its strength from a chemical reaction that occurs over time during curing. After it’s had time to cure, which usually take 28 days to complete, Quikrete can reach strengths up to 5000 psi. If you have any questions or comments us any time.
What are the properties of quick setting cement?
What is quick-setting cement? – Fast-setting cement is a binding material with properties similar to the traditional Portland cement, Its main attribute is its fast setting time, which can harden in a time ranging between 20 to 40 minutes. 
Source: southerncement.co.uk Unlike traditional Portland cement, fast-setting cement doesn’t lose strength nor is it negatively affected by its fast hardening in any way. What’s more, its mixture is capable of achieving high mechanical resistance in a short period.
How fast is quick setting cement?
PRODUCT USE QUIKRETE® Fast Setting Concrete Mix is a general purpose concrete designed to achieve final set in 20-40 minutes. Fast Setting Concrete Mix is suitable for setting posts and pouring slabs when a rapid return to service is desired.
Which of the following compound is added to cement?
Gypsum is called the retarding agent of cement which is mainly used for regulating the setting time of cement and is an indispensable component.
Which of the following add a quick setting time of cement?
Discussion :: Building Materials – Section 3 ( Q.No.22 ) –
| Ankit Bhadola said: (Aug 22, 2015) | |
| Answer is C. Quick Setting Cement as the name indicates, these types of cements are used where quick setting is needed. The quick setting cement is manufactured by adding a small percentage of aluminum sulphate and then it is finely grinded with cement. And also for quick setting action a small percentage of gypsum or retarder is added. The aluminum sulphate is mainly added to accelerate the setting time fast. |
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
table>
Civil Engineering – Building Materials – Discussion
Which compound added to cement clinker?
Answer Verified Hint: Gypsum is a mineral and is hydrated calcium sulfate in chemical form. You should know that gypsum plays a very important role in controlling the rate of hardening of the cement. Complete step by step answer: Let us see what gypsum is. Gypsum is naturally occurring mineral mined from deposits formed by ancient seabeds as a raw material.
It is composed of calcium sulfate and water; it is used for a variety of manufacturing, industrial and agricultural uses. An important property of gypsum is that it is naturally fire-resistant. The chemical formula of gypsum is $CaS _,2 _ O$. Let us see what happens when gypsum is added in the cement.
In the manufacturing process of cement, clinkers are formed. These cement clinkers are cooled down and added with a small amount of gypsum. The mixture is then sent to the final grinding process. The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water.
During the cement manufacturing process, upon the cooling of the clinker, a small amount of gypsum is introduced during the final grinding process. Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.
How to Make Thin Repairs to Damaged Concrete with QUIKRETE®
Hence, Gypsum is added to the cement clinker to decrease the rate of setting of cement. Therefore, option A is the required answer. Note: You should know that gypsum cement possesses considerably greater strength and hardness when compared to non-gypsum cement.
