SIKA AT WORK Central Subway , , uSa Central Subway tunnel San FranCiSCo

PROJECT DESCRIPTION PROJECT REQUIREMENTS the Central Subway tunnel in San Francisco, is a tunnel construction was executed by using two tunnel- $233 million uS project being constructed between March ing boring Machines (tbMs) with a boring speed of 40 feet 2012 and March 2015. the double tube tunnel is 1.7 miles (2.7 (12 meters) per day and required a constant supply of con- km) long and 20 feet (6 meters) in diameter. it represents the crete tunnel segments. to accomplish this, the production of backbone of the extension of muni’s third line and will provide 21,258 segments representing approx. 36,600 yd³ (28,000 a signiicant decrease in travel times between 4th and King m³) of concrete was required. in order to produce such a large Street and Chinatown. Full operation is scheduled for 2019. it amount of tunnel segments in a short period of time, 60 seg- will be a crucial travel artery, reducing current travel times of ments per day had to be produced. this production rate could more than 20 minutes down to just 8 minutes, for a distance only be accomplished by using a high early strength concrete, of 1.7 miles (2.7 km). gaining a minimum stripping strength of 17 MPa (2,500 psi) at the age of 14 hours. COIT SIKA SOLUTION Lombard St. Columbus Ave. TOWER The Embarcadero Washington Sika admixtures Plastocrete® 161, Sika® ViscoCrete® 2100, Square Park

T Union St. U N N E SikaCrete® 950 DP, Sika® Fiber HP, as well as SikaSet® nC L

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(when set acceleration and faster strength gain was neces- S

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E Ferry Building sary) ensured the trouble free production of the high quality Washington St. T CHINATOWN tunnel segments. this admixture combination guaranteed a Battery St. Montgomery St.

Kearny St. required 30 minute slump life to place conventional concrete Stockton St. EMBARCADERO California St. with a slump of 6-7 inches (150 – 175 mm) into concrete forms Leavenworth St. Bush St. FOLSOM FUTURE TRANSBAY and to perform all inishing operations. the use of SikaSet® Post St. MONTGOMERY TERMINAL UNION SQUARE/ 1st St. nC, a non-chloride accelerating admixture, during the colder MARKET STREET Market St.

J K L M N T 2nd St. weather assured early strength development without any ad- Mission St. POWELL ditional concrete heating. Howard St. BRANNAN Harrison St. Folsom St. 4th St. I-80 Golden Gate St. YERBA BUENA/

MOSCONE 5th St. last but not least, the concrete plasticity at the time of con- 3rd St. 2ND ST. AND KING CIVIC solidation had to be such that it provided an excellent bughole 6th St. CENTER 7th St. 4TH ST. AND AT&T BALLPARK King St. free surface needed to fulill stringent requirements for T Third Phase 2 BRANNAN 4TH AND KING/BERRY N T

vacuum lifting. Bryant St.

Brannan St. MISSION ROCK Townsend St. 11th St.

HIGHWAY 101 UCSF UCSF MISSION BAY S a

16th St. n

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22ND ST. 23RD ST.

24th St. 25th St.

Muni Metro East

Cesar Chavez St. MARIN

Jerrold Ave. Cargo Way Evans Ave.

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I-280 T Third Phase 1 Phase Third T Oakdale Ave. HUDSON/INNES Palou Ave.

Phelps St. KIRKWOOD/LA SALLE

Silver Ave.

OAKDALE/PALOU

REVERE/SHAFTER

San Bruno Ave. WILLIAMS

LEGEND CARROLL

T Third Phase 2

T Third Phase 1 GILMAN/PAUL Mansell St.

Gilman Ave. LE CONTE

BART

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Visitacion Ave. CANDLESTICK PARK

Harney Way T SUNNYDALE BAYSHORE SiKa at worK

Tunnel Geneva Sika Green roof System 3 SiKa aDMixtureS For PreCaSt

SIKA PRODUCTS PROJECT PARTICIPANTS ́Plastocrete® 161 water reducer ́Client: San Francisco Municipal transportation authority ́Sika® ViscoCrete®-2100 Superplasticizer ́Preliminary engineering Firms: Parsons brinckerhof’s San Francisco and Cleveland, ́SikaSet® nC Set accelerator along with San Francisco–based PGH wong engineering, inc. ́Sikacrete® 950 DP Microsilica ́Final Design: Pb telamon (joint venture of the San Francisco oice of Parsons brinckerhof ́Sika® Fiber HP (2lbs/yd) Micro Synthetic Fiber and San Francisco–based telamon engineering Consultants, inc.) ́Segment Producer: Precast Management Corporation ́Contractor: barnard impregilo Healy joint venture

our most current General Sales Conditions shall apply. Please consult the Data Sheet prior to any use and processing. © Sika Services aG / tunneling / CMDl / 08. 2014 / 821 / iD:48798

SIKA SERVICES AG Contact tüfenwies 16 Phone +41 58 436 40 40 CH-8048 Zürich Fax +41 58 436 41 50 Switzerland www.sika.com