Exhibit 3.37a State of Delaware Secretary of State Division of Corporations FILED 09:00 AM 02/01/2000 001052095 - 3169313 CERTIFICATE OF INCORPORATION OF CONCRETE XXX ACQUISITION, INC. The undersigned, a natural person, for the purpose of organizing a corporation for conducting the business and promoting the purposes hereinafter stated, under the provisions and subject to the requirements of the laws of the State of Delaware (particularly Chapter 1, Title 8 of the Delaware Code and the acts amendatory thereof and supplemental thereto, and known, identified, and referred to as the "General Corporation Law of the State of Delaware"), hereby certifies that: FIRST: The name of the corporation (hereinafter called the "corporation") is Concrete XXX Acquisition, Inc. SECOND: The address, including street, number, city and county, of the registered office of the corporation in the State of Delaware is 1013 Centre Road, City of Wilmington, 19805, County of New Castle; and the name of the registered agent of the corporation in the State of Delaware at such address is Corporation Services Company. THIRD: The purpose of the corporation shall be to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware. FOURTH: The total number of shares of stock which the corporation shall have authority to issue is one thousand (1,000). The par value of each such shares is $1.00. All such shares are of one class and are shares of Common Stock. FIFTH: The name and the mailing address of the incorporator are as follows: Stephanie A. Thomas c/o U.S. Concrete, Inc. 1300 Post Oak Blvd., Suite 1220 Houston, Texas 77056 SIXTH: The name and address of the person who is to serve as the initial director of the corporation until the first annual meeting of stockholders or until his successor is elected and qualified is: Donald Wayne c/o U.S. Concrete, Inc. 1300 Post Oak Blvd., Suite 1220 Houston, Texas 77056 SEVENTH: The management of the business and the conduct of the affairs of the corporation shall be vested in its Board of Directors. The number of directors which shall constitute the whole Board of Directors shall be fixed by, or in the manner provided in, the By-laws. The phrase "whole Board" and the phrase "total number of directors" shall be deemed to have the same meaning, to wit, the total number of directors which the corporation would have if there were no vacancies. No election of directors need be by written ballot. EIGHTH: In furtherance and not in limitation of the powers conferred by statute, the Board of Directors of the corporation is expressly authorized to adopt the original By-laws of the corporation, to amend or repeal the By-laws or to adopt new By-laws, subject to any limitations that may be contained in such By-laws. NINTH: To the fullest extent permitted by the provisions of paragraph (7) of subsection (b) of Section 102 of the General Corporation Law of the State of Delaware, as the same exists or may hereafter be amended or supplemented, a director of the corporation shall not be liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director. Any repeal or amendment of this Article NINTH by the stockholders of the corporation or by changes in applicable law shall, to the extent permitted by applicable law, be prospective only, and shall not adversely affect any limitation on the personal liability of any director of the corporation existing at the time of such repeal or amendment. TENTH: The corporation shall, to the fullest extent permitted by the provisions of Section 145 of the General Corporation Law of the State of Delaware, as the same exists or may hereafter be amended or supplemented, indemnify any and all persons whom it shall have power to indemnify under said section from and against any and all of the expenses, liabilities, or other matters referred to in or covered by said section, and the indemnification provided for herein shall not be deemed exclusive of any other rights to which those indemnified may be entitled under any By-law, agreement, vote of stockholders or disinterested directors or otherwise, both as to action in such person's official capacity and as to action in another capacity while holding such office, and shall continue as to a person who has ceased to be a director, officer, employee, or agent and shall inure to the benefit of the heirs, executors, and administrators of such a person. ELEVENTH: Whenever a compromise or arrangement is proposed between this corporation and its creditors or any class of them and/or between this corporation and its stockholders or any class of them, any court of equitable jurisdiction within the State of Delaware may, on the application in a summary way of this corporation or of any creditor or stockholder thereof or on the application of any receiver or receivers appointed for this corporation under Section 291 of Title 8 of the Delaware Code or on the application of trustees in dissolution or of any receiver or receivers appointed for this corporation under Section 279 of Title 8 of the Delaware Code, order a meeting of the creditors or class of creditors, and/or of the stockholders or class of stockholders of this corporation, as the case may be, to be summoned in 2 such manner as the said court directs. If a majority in number representing three-fourths in value of the creditors or class of creditors, and/or of the stockholders or class of stockholders of this corporation, as the case may be, agree to any compromise or arrangement and to any reorganization of this corporation as consequence of such compromise or arrangement, the said compromise or arrangement and the said reorganization shall, if sanctioned by the court to which the said application has been made, be binding on all the creditors or class of creditors, and/or on all the stockholders or class of stockholders, of this corporation, as the case may be, and also on this corporation. TWELFTH: From time to time any of the provisions of this certificate of incorporation may be amended, altered, or repealed, and other provisions authorized by the laws of the State of Delaware at the time in force may be added or inserted in the manner and at the time prescribed by said laws, and all rights at any time conferred upon the stockholders of the corporation by this certificate of incorporation are granted subject to the provisions of this Article TWELFTH. THIRTEENTH: This certificate of incorporation shall be effective upon its filing with the Secretary of State of the State of Delaware. IN WITNESS WHEREOF, the incorporator of the corporation hereto has caused this certificate of incorporation to be duly executed as of January 31, 2000. /s/ Stephanie A. Thomas ---------------------------------------- Stephanie A. Thomas, Incorporator 3