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cement in the mixture will determine the strength; usually at a cure time of 28 days to measure strength in psi (pounds per square inch). While most concrete is a minimum of 3000 psi strength, some may run as high as 14,500 psi for specialty applications. Some applications may require reinforced concrete that incorporates steel mesh or re-bar set in the forms before pouring.
A basic guideline is the rule of 6: * At least 6 bags of Portland cement per cubic yard. * No more than 6 gallons of water per cubic yard. * A minimum of 6 days curing time, while keeping concrete moist by misting several times each day. * When concrete will be subjected to freezing and thawing, an air content of 6% is necessary. * For most applications such as concrete steps, sidewalks, floors, driveways, etc, mix using this 6 part ratio; 1 part Portland cement, 2 parts sand, 3 parts gravel or crushed rock. In addition to accurate mixing, properly pouring concrete involves several aspects: screeding (leveling), vibrating (eliminating voids in the slab), troweling (finishing the surface), and jointing (adding expansion joints for large slabs to expand and contract without breaking or cracking). 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Reliable local service providers immediately begin providing competitive bids for the project in days, even hours from posting. Project owners can view contractor portfolios and credentials online at HandyAmerican.com 24-hours a day. And then make contact with only those contractors of their choosing for their concrete project or none at all. 1. Motorola divides into two separate companies data: 27.03.08 Motorola's chief executive said he hoped that by spinning off the unprofitable mobile phone unit, the company would have better luck attracting a new chief executive to revive it. 2. New Labour chief may reject job over debt data: 10.04.08 The crisis engulfing Gordon Brown's leadership has deepened after the man he hand-picked to clean up Labour's finances held back from taking up the job amid fears about the party's ÂŁ20 million debt. 3. Yevgeny Primakov, former prime minister of Russia, supports partition of Kosovo data: 27.03.08 He said that only ethnic partition would avoid future conflict but warned that it would entail population movements. 4. Delia recipes 'loaded with salt' data: 07.04.08 Campaigners attack recipes in Delia Smith's latest book for being too high in salt. 5. Owning a cat 'cuts stroke risk by third' data: 19.03.08 Owning a cat can reduce the risk of heart attacks and strokes by more than a third, researchers have found. 6. EU moves toward allowing in-flight cellphone calls data: 07.04.08 The new regulations, to be released Monday, will remove a major obstacle for companies that want to sell the service. 7. Zimbabwe election run-up 'flawed' data: 19.03.08 Zimbabwe is failing to meet its democratic obligations ahead of elections next week, says a human rights group. 8. Nikolai Baibakov, Stalin's oil minister, dies at 97 data: 07.04.08 Nikolai Baibakov, who oversaw Russian oil production during World War II and went on to become one of the Soviet Union's top economic officials, died Monday in Moscow. 9. Pssst - Want an unlocked phone? data: 27.03.08 Wireless carriers often offer customers cheap or free phones in exchange for multi-year contracts, but then the phones are technologically "locked" - the subscriber cannot cancel the contract and sign up for service with another company. 10. Has Sir Alan met his match in The Apprentice? data: 19.03.08 Sir Alan Sugar, the archetypal bully best known for his withering put-downs, will come face to face on the new series of The Apprentice with a woman who successfully sued a city law firm for victimisation. 11. Junior doctors 'bullied' into unpaid overtime data: 07.04.08 More than half of junior doctors are being "bullied" to work hours of unpaid overtime, the British Medical Association has warned. 12. Clashes in Egypt strike stand-off data: 07.04.08 Egyptian textile workers and police clash after security forces take over their factory to prevent a major strike. 13. Heather Mills's 'exaggerated career claims' data: 19.03.08 Heather Mills' 'exaggerated career claims' 14. What's so bad about Slough? data: 27.03.08 "Slough," which rhymes with "cow" and means "muddy quagmire," is not the only cross the English town has to bear now that a book has appeared, picking on it for being a grim, cheerless wasteland. 15. Turkish court weighs bid to shut down governing party data: 07.04.08 The petition alleging Islamist activities has divided Turkey, increased uncertainty in the financial markets and could undermine Ankara's campaign to join the European Union. 16. Who'd be a toilet attendant? data: 10.04.08 You visit a fancy bar. You go to the toilet. As you wash your hands, a man passes over some nice paper towels. He seems to expect a tip. Welcome to one of the UK's grimmest workplaces. 17. Sue Carroll: Shameless to sneer at Shannon's family data: 19.03.08 For a nation which has spent the best part of a year praying for the safe return of Madeleine McCann, news that missing girl Shannon Matthews had been found alive was joyous. 18. Sir Paul McCartney and Heather Mills divorce: Judge's full ruling to be made public data: 19.03.08 Previously unknown details of Sir Paul McCartney's divorce settlement are to be made public, after a court refused Heather Mills's application for secrecy. 19. Boring press conference, telling moment data: 27.03.08 20. 'Modern mums are spoiling children' data: 07.04.08 Competitive modern mothers are producing a generation of demanding, spoilt children, according to a report on parenting. 21. Fed loses its unified voice data: 10.04.08 As the U.S. Federal Reserve Board deals with the biggest American financial crisis in a generation, its policies are coming under criticism from within. 22. The promise of qualifying in Malaysia data: 27.03.08 23. Dutch court to consider bid to ban anti-Islam movie data: 27.03.08 A Dutch court said Friday it would hear a complaint lodged by Muslim groups seeking to bar the politician Geert Wilders from releasing his film on the Koran. 24. Brian Reade: Blow me down.. it was only a bit wet data: 19.03.08 The good people of Columbus, Ohio, probably didn't have time to watch much international TV news this week. 25. Can the Dalai Lama resign? data: 19.03.08 It's been suggested the Dalai Lama would resign if Tibetans launch an armed struggle with China. But is that possible? 26. Kurds and police clash for 5th day in Turkey data: 27.03.08 The police on Monday broke up a protest by hundreds of masked and stone-throwing Kurdish demonstrators during the fifth straight day of clashes that have killed two people and wounded dozens, news reports in Turkey said. 27. Bosnia police arrest 5 terrorism suspects in raid data: 27.03.08 During the raid on the suspects' homes in Sarajevo and Bugojno, the police seized anti-tank mines, laser sights, maps and manuals describing how to build bombs, officials said Friday. 28. Two titles apologise to McCanns data: 19.03.08 The Daily Express and the Daily Star apologise to Kate and Gerry McCann over their reporting of missing daughter Madeleine. 29. BP and ConocoPhillips to build gas pipeline to United States and Canada data: 10.04.08 BP and Conoco will initially spend $600 million in the next three years to drum up support for the Alaska project, which they said would be the largest-ever private-sector construction project in North America. 30. Extra troops to be sent to fight Taliban data: 07.04.08 Britain is poised to send another 450 troops to Afghanistan and take control of its most war-torn region for at least the next two years following pressure from the United States, The Daily Telegraph has learned. --- --- --- -x- |