ACI 351.1R-12 PDF Download

ACI 351.1R-12 is a standard report that provides guidance on grouting between foundations and bases for supporting equipment and machinery. The report outlines current practices, recommendations, and various approaches for grouting operations, taking into account the opinions and experiences of manufacturers, technical representatives, and users. While there is limited published research available, the information in this report is considered to be the most current.

The report covers materials and installation methods for load-transfer grouts used between machine or equipment bases and their foundations. It describes the characteristics of the grout materials, test methods for predicting long-term performance, and installation procedures. Additionally, the information provided may also be applicable for other applications that require filling the space between load-carrying members, such as column baseplates or joints between precast concrete elements.

The need for grouting arises when machinery and equipment require precise alignment or uniform support, which cannot be achieved by placing them directly on finished concrete surfaces. Both the concrete surface and the machine base have irregularities that can pose alignment difficulties and bear load concentrations. To address this, machine bases or soleplates are aligned and leveled using shimming or other methods, and the resulting space between the machine base and the foundation is filled with a load-transfer grout material. The most commonly used grout materials in these applications are nonshrink cementitious grouts and nonshrink epoxy grouts.