Exhibit 3.42b

                                                         STATE OF DELAWARE
                                                        SECRETARY OF STATE
                                                     DIVISION OF CORPORATIONS
                                                   DELIVERED 05:59 PM 12/20/2004
                                                     FILED 05:59 PM 12/20/2004
                                                   SRV 040923901 - 3169307 FILE

                               STATE OF DELAWARE
                            CERTIFICATE OF AMENDMENT
                        OF CERTIFICATE OF INCORPORATION

The corporation organized and existing under and by virtue of the General
Corporation

Law of the State of Delaware does hereby certify:

FIRST: That at a meeting of the Board of Directors of Concrete XXIX Acquisition,
Inc. resolutions were duly adopted setting forth a proposed amendment of the
Certificate of Incorporation of said corporation, declaring said amendment to be
advisable and calling a meeting of the stockholders of said corporation for
consideration thereof. The resolution setting forth the proposed amendment is as
follows;

RESOLVED, that the Certificate of Incorporation of this corporation be amended
by changing the Article thereof numbered "FIRST" so that, as amended, said
Article shall be and read as follows:

The name of the corporation (hereinafter called the "corporation") is USC
Payroll, Inc.


SECOND: That thereafter, pursuant to resolution of its Board of Directors, a
special meeting of the stockholders of said corporation was duly called and held
upon notice in accordance with Section 222 of the General Corporation Law of the
State of Delaware at which meeting the necessary number of shares as required by
statute were voted in favor of the amendment.

THIRD: That said amendment was duly adopted in accordance with the provisions of
Section 242 of the General Corporation Law of the State of Delaware.

FOURTH: That the capital of said corporation shall not be reduced under or by
reason of said amendment.

IN WITNESS WHEREOF, said corporation has caused this certificate to be signed
this 20th day of December, 2004.


                                        By: [signed]
                                            ------------------------------------
                                            Authorized Officer
                                        Title: Secretary
                                        Name: Donald C. Wayne
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